diff --git a/lib/dry/system.rb b/lib/dry/system.rb
index f0bd4c66c..1707f6270 100644
--- a/lib/dry/system.rb
+++ b/lib/dry/system.rb
@@ -27,17 +27,6 @@ def self.register_provider_sources(path)
       provider_sources.load_sources(path)
     end
 
-    def self.register_provider(_name, options)
-      Dry::Core::Deprecations.announce(
-        "Dry::System.register_provider",
-        "Use `Dry::System.register_provider_sources` instead",
-        tag: "dry-system",
-        uplevel: 1
-      )
-
-      register_provider_sources(options.fetch(:path))
-    end
-
     # Registers a provider source, which can be used as the basis for other providers
     #
     # @api public
@@ -49,26 +38,10 @@ def self.register_provider_source(name, group:, source: nil, &block)
       if source
         provider_sources.register(name: name, group: group, source: source)
       else
-        provider_sources.register_from_block(
-          name: name,
-          group: group,
-          target_container: self,
-          &block
-        )
+        provider_sources.register_from_block(name: name, group: group, &block)
       end
     end
 
-    def self.register_component(name, provider:, &block)
-      Dry::Core::Deprecations.announce(
-        "Dry::System.register_component",
-        "Use `Dry::System.register_provider_source` instead",
-        tag: "dry-system",
-        uplevel: 1
-      )
-
-      register_provider_source(name, group: provider, &block)
-    end
-
     # @api private
     def self.provider_sources
       @provider_sources ||= ProviderSourceRegistry.new
diff --git a/lib/dry/system/components.rb b/lib/dry/system/components.rb
deleted file mode 100644
index 7f1485ad4..000000000
--- a/lib/dry/system/components.rb
+++ /dev/null
@@ -1,10 +0,0 @@
-# frozen_string_literal: true
-
-Dry::Core::Deprecations.announce(
-  "require \"dry/system/components\"",
-  "Use `require \"dry/system/provider_sources\"` instead",
-  tag: "dry-system",
-  uplevel: 1
-)
-
-require_relative "provider_sources"
diff --git a/lib/dry/system/config/component_dir.rb b/lib/dry/system/config/component_dir.rb
index 0f98870f1..36987606b 100644
--- a/lib/dry/system/config/component_dir.rb
+++ b/lib/dry/system/config/component_dir.rb
@@ -190,40 +190,6 @@ class ComponentDir
         #   @api public
         setting :add_to_load_path, default: true
 
-        # @api public
-        def default_namespace=(namespace)
-          Dry::Core::Deprecations.announce(
-            "Dry::System::Config::ComponentDir#default_namespace=",
-            "Add a namespace instead: `dir.namespaces.add #{namespace.to_s.inspect}, key: nil`",
-            tag: "dry-system",
-            uplevel: 1
-          )
-
-          # We don't have the configured separator here, so the best we can do is guess
-          # that it's a dot
-          namespace_path = namespace.gsub(".", PATH_SEPARATOR)
-
-          return if namespaces.namespaces[namespace_path]
-
-          namespaces.add namespace_path, key: nil
-        end
-
-        # @api public
-        def default_namespace
-          Dry::Core::Deprecations.announce(
-            "Dry::System::Config::ComponentDir#default_namespace",
-            "Use namespaces instead, e.g. `dir.namespaces`",
-            tag: "dry-system",
-            uplevel: 1
-          )
-
-          ns_path = namespaces.to_a.reject(&:root?).first&.path
-
-          # We don't have the configured separator here, so the best we can do is guess
-          # that it's a dot
-          ns_path&.gsub(PATH_SEPARATOR, ".")
-        end
-
         # @!endgroup
 
         # Returns the component dir path, relative to the configured container root
diff --git a/lib/dry/system/config/namespaces.rb b/lib/dry/system/config/namespaces.rb
index c5ca5abbb..e3620e664 100644
--- a/lib/dry/system/config/namespaces.rb
+++ b/lib/dry/system/config/namespaces.rb
@@ -44,19 +44,7 @@ def namespace(path)
         # @return [Namespace, nil] the root namespace, if configured
         #
         # @api public
-        def root(**options)
-          if options.any?
-            Dry::Core::Deprecations.announce(
-              "Dry::System::Config::Namespaces#root (with arguments)",
-              "Use `#add_root(key: nil, const: nil)` instead",
-              tag: "dry-system",
-              uplevel: 1
-            )
-
-            add_root(**options)
-            return
-          end
-
+        def root
           namespaces[Namespace::ROOT_PATH]
         end
 
diff --git a/lib/dry/system/container.rb b/lib/dry/system/container.rb
index eb1560801..51e2e4046 100644
--- a/lib/dry/system/container.rb
+++ b/lib/dry/system/container.rb
@@ -59,7 +59,6 @@ class Container
       setting :name
       setting :root, default: Pathname.pwd.freeze, constructor: ->(path) { Pathname(path) }
       setting :provider_dirs, default: ["system/providers"]
-      setting :bootable_dirs # Deprecated for provider_dirs, see .provider_paths below
       setting :registrations_dir, default: "system/registrations"
       setting :component_dirs, default: Config::ComponentDirs.new, cloneable: true
       setting :exports, reader: true
@@ -73,8 +72,6 @@ class Container
       config.namespace_separator = KEY_SEPARATOR
 
       class << self
-        extend Dry::Core::Deprecations["Dry::System::Container"]
-
         # @!method config
         #   Returns the configuration for the container
         #
@@ -179,27 +176,9 @@ def configured?
         #  been finalized
         #
         # @api public
-        def import(keys: nil, from: Undefined, as: Undefined, **deprecated_import_hash)
+        def import(from:, as:, keys: nil)
           raise Dry::System::ContainerAlreadyFinalizedError if finalized?
 
-          if deprecated_import_hash.any?
-            Dry::Core::Deprecations.announce(
-              "Dry::System::Container.import with {namespace => container} hash",
-              "Use Dry::System::Container.import(from: container, as: namespace) instead",
-              tag: "dry-system",
-              uplevel: 1
-            )
-
-            deprecated_import_hash.each do |namespace, container|
-              importer.register(container: container, namespace: namespace)
-            end
-            return self
-          elsif from == Undefined || as == Undefined
-            # These keyword arguments can become properly required in the params list once
-            # we remove the deprecation shim above
-            raise ArgumentError, "required keyword arguments: :from, :as"
-          end
-
           importer.register(container: from, namespace: as, keys: keys)
 
           self
@@ -298,26 +277,6 @@ def register_provider(...)
 
         # rubocop:enable Layout/LineLength
 
-        # @see .register_provider
-        # @api public
-        def boot(name, **opts, &block)
-          Dry::Core::Deprecations.announce(
-            "Dry::System::Container.boot",
-            "Use `Dry::System::Container.register_provider` instead",
-            tag: "dry-system",
-            uplevel: 1
-          )
-
-          register_provider(
-            name,
-            namespace: opts[:namespace],
-            from: opts[:from],
-            source: opts[:key],
-            &block
-          )
-        end
-        deprecate :finalize, :boot
-
         # Return if a container was finalized
         #
         # @return [TrueClass, FalseClass]
@@ -410,7 +369,6 @@ def prepare(name)
           providers.prepare(name)
           self
         end
-        deprecate :init, :prepare
 
         # Stop a specific component but calls only `stop` lifecycle trigger
         #
@@ -570,7 +528,6 @@ def component_dirs
         def providers
           @providers ||= config.provider_registrar.new(self)
         end
-        deprecate :booter, :providers
 
         # @api private
         def auto_registrar
diff --git a/lib/dry/system/errors.rb b/lib/dry/system/errors.rb
index ff3e9d401..54e2cb786 100644
--- a/lib/dry/system/errors.rb
+++ b/lib/dry/system/errors.rb
@@ -2,8 +2,6 @@
 
 module Dry
   module System
-    extend Dry::Core::Deprecations["dry-system"]
-
     # Error raised when import is called on an already finalized container
     #
     # @api public
@@ -48,8 +46,6 @@ def initialize(provider_name)
         super("Provider #{provider_name.inspect} has already been registered")
       end
     end
-    DuplicatedComponentKeyError = ProviderAlreadyRegisteredError
-    deprecate_constant :DuplicatedComponentKeyError
 
     # Error raised when a named provider could not be found
     #
@@ -59,8 +55,6 @@ def initialize(name)
         super("Provider #{name.inspect} not found")
       end
     end
-    InvalidComponentError = ProviderNotFoundError
-    deprecate_constant :InvalidComponentError
 
     # Error raised when a named provider source could not be found
     #
diff --git a/lib/dry/system/provider/source.rb b/lib/dry/system/provider/source.rb
index f02dd7bac..42ad58b14 100644
--- a/lib/dry/system/provider/source.rb
+++ b/lib/dry/system/provider/source.rb
@@ -37,11 +37,11 @@ class << self
           # @see Dry::System::Provider::SourceDSL
           #
           # @api private
-          def for(name:, group: nil, target_container:, &block) # rubocop:disable Style/KeywordParametersOrder
+          def for(name:, group: nil, &block)
             Class.new(self) { |klass|
               klass.source_name name
               klass.source_group group
-              SourceDSL.evaluate(klass, target_container, &block) if block
+              SourceDSL.evaluate(klass, &block) if block
             }
           end
 
@@ -183,21 +183,6 @@ def start; end
         # @api public
         def stop; end
 
-        def use(*provider_names)
-          Dry::Core::Deprecations.announce(
-            "Dry::System::Provider#use",
-            "Use `target_container.start` instead, e.g. `target_container.start(:another_provider)`", # rubocop:disable Layout/LineLength
-            tag: "dry-system",
-            uplevel: 1
-          )
-
-          provider_names.each do |name|
-            target_container.start(name)
-          end
-
-          self
-        end
-
         # Registers a "before" callback for the given lifecycle step.
         #
         # The given block will be run before the lifecycle step method is run. The block
@@ -212,17 +197,6 @@ def use(*provider_names)
         #
         # @api public
         def before(step_name, &block)
-          if step_name.to_sym == :init
-            Dry::Core::Deprecations.announce(
-              "Dry::System::Provider before(:init) callback",
-              "Use `before(:prepare)` callback instead",
-              tag: "dry-system",
-              uplevel: 1
-            )
-
-            step_name = :prepare
-          end
-
           callbacks[:before][step_name] << block
           self
         end
@@ -241,17 +215,6 @@ def before(step_name, &block)
         #
         # @api public
         def after(step_name, &block)
-          if step_name.to_sym == :init
-            Dry::Core::Deprecations.announce(
-              "Dry::System::Provider after(:init) callback",
-              "Use `after(:prepare)` callback instead",
-              tag: "dry-system",
-              uplevel: 1
-            )
-
-            step_name = :prepare
-          end
-
           callbacks[:after][step_name] << block
           self
         end
@@ -259,18 +222,7 @@ def after(step_name, &block)
         # @api private
         def run_callback(hook, step)
           callbacks[hook][step].each do |callback|
-            if callback.parameters.any?
-              Dry::Core::Deprecations.announce(
-                "Dry::System::Provider::Source.before and .after callbacks with single block parameter", # rubocop:disable Layout/LineLength
-                "Use `provider_container` (or `container` for short) inside your block instead",
-                tag: "dry-system",
-                uplevel: 1
-              )
-
-              instance_exec(provider_container, &callback)
-            else
-              instance_eval(&callback)
-            end
+            instance_eval(&callback)
           end
         end
 
diff --git a/lib/dry/system/provider/source_dsl.rb b/lib/dry/system/provider/source_dsl.rb
index bee6bf8f3..f82caca3f 100644
--- a/lib/dry/system/provider/source_dsl.rb
+++ b/lib/dry/system/provider/source_dsl.rb
@@ -10,19 +10,8 @@ class Provider
       #
       # @api private
       class SourceDSL
-        extend Dry::Core::Deprecations["Dry::System::Provider::SourceDSL"]
-
-        def self.evaluate(source_class, target_container, &block)
-          if block.parameters.any?
-            Dry::Core::Deprecations.announce(
-              "Dry::System.register_provider with single block parameter",
-              "Use `target_container` (or `target` for short) inside your block instead",
-              tag: "dry-system"
-            )
-            new(source_class).instance_exec(target_container, &block)
-          else
-            new(source_class).instance_eval(&block)
-          end
+        def self.evaluate(source_class, &block)
+          new(source_class).instance_eval(&block)
         end
 
         attr_reader :source_class
@@ -35,35 +24,9 @@ def setting(...)
           source_class.setting(...)
         end
 
-        # rubocop:disable Layout/LineLength
-
-        def settings(&block)
-          Dry::Core::Deprecations.announce(
-            "Dry::System.register_provider with nested settings block",
-            "Use individual top-level `setting` declarations instead (see dry-configurable docs for details)",
-            tag: "dry-system",
-            uplevel: 1
-          )
-
-          DeprecatedSettingsDSL.new(self).instance_eval(&block)
-        end
-
-        # rubocop:enable Layout/LineLength
-
-        class DeprecatedSettingsDSL
-          def initialize(base_dsl)
-            @base_dsl = base_dsl
-          end
-
-          def key(name, type)
-            @base_dsl.setting(name, constructor: type)
-          end
-        end
-
         def prepare(&block)
           source_class.define_method(:prepare, &block)
         end
-        deprecate :init, :prepare
 
         def start(&block)
           source_class.define_method(:start, &block)
diff --git a/lib/dry/system/provider_registrar.rb b/lib/dry/system/provider_registrar.rb
index 1597b827b..f0ae4bb9f 100644
--- a/lib/dry/system/provider_registrar.rb
+++ b/lib/dry/system/provider_registrar.rb
@@ -15,8 +15,6 @@ module System
     #
     # @api private
     class ProviderRegistrar
-      extend Dry::Core::Deprecations["Dry::System::Container"]
-
       # @api private
       attr_reader :providers
 
@@ -138,7 +136,6 @@ def provider_files
           end
         }.first
       end
-      deprecate :boot_files, :provider_files
 
       # @api private
       def finalize!
@@ -184,24 +181,9 @@ def stop(provider_name)
 
       private
 
-      # rubocop:disable Metrics/AbcSize, Metrics/PerceivedComplexity, Layout/LineLength
       # @api private
       def provider_paths
         provider_dirs = container.config.provider_dirs
-        bootable_dirs = container.config.bootable_dirs || ["system/boot"]
-
-        if container.config.provider_dirs == ["system/providers"] && \
-           provider_dirs.none? { |d| container.root.join(d).exist? } && \
-           bootable_dirs.any? { |d| container.root.join(d).exist? }
-          Dry::Core::Deprecations.announce(
-            "Dry::System::Container.config.bootable_dirs (defaulting to 'system/boot')",
-            "Use `Dry::System::Container.config.provider_dirs` (defaulting to 'system/providers') instead",
-            tag: "dry-system",
-            uplevel: 2
-          )
-
-          provider_dirs = bootable_dirs
-        end
 
         provider_dirs.map { |dir|
           dir = Pathname(dir)
@@ -213,14 +195,9 @@ def provider_paths
           end
         }
       end
-      # rubocop:enable Metrics/AbcSize, Metrics/PerceivedComplexity, Layout/LineLength
 
       def build_provider(name, namespace:, source: nil, &block)
-        source_class = source || Provider::Source.for(
-          name: name,
-          target_container: container,
-          &block
-        )
+        source_class = source || Provider::Source.for(name: name, &block)
 
         Provider.new(
           name: name,
diff --git a/lib/dry/system/provider_source_registry.rb b/lib/dry/system/provider_source_registry.rb
index 76236e01e..e75899b2e 100644
--- a/lib/dry/system/provider_source_registry.rb
+++ b/lib/dry/system/provider_source_registry.rb
@@ -22,31 +22,19 @@ def register(name:, group:, source:)
         sources[key(name, group)] = source
       end
 
-      def register_from_block(name:, group:, target_container:, &block)
+      def register_from_block(name:, group:, &block)
         register(
           name: name,
           group: group,
           source: Provider::Source.for(
             name: name,
             group: group,
-            target_container: target_container,
             &block
           )
         )
       end
 
       def resolve(name:, group:)
-        if group == :system
-          Dry::Core::Deprecations.announce(
-            "Providers using `from: :system`",
-            "Use `from: :dry_system` instead",
-            tag: "dry-system",
-            uplevel: 1
-          )
-
-          group = :dry_system
-        end
-
         sources[key(name, group)].tap { |source|
           unless source
             raise ProviderSourceNotFoundError.new(
diff --git a/lib/dry/system/provider_sources/settings/config.rb b/lib/dry/system/provider_sources/settings/config.rb
index f814361b3..168f9ba8f 100644
--- a/lib/dry/system/provider_sources/settings/config.rb
+++ b/lib/dry/system/provider_sources/settings/config.rb
@@ -51,19 +51,6 @@ def self.load(root:, env:, loader: Loader)
             end
           end
 
-          # rubocop:disable Layout/LineLength
-          def self.key(name, type)
-            Dry::Core::Deprecations.announce(
-              "Dry::System :settings provider source setting definition using `key`",
-              "Use `setting` instead, with dry-configurable `setting` options, e.g. `setting :my_setting, default: \"hello\", constructor: Types::String.constrained(min_length: 3)`",
-              tag: "dry-system",
-              uplevel: 1
-            )
-
-            setting(name, constructor: type)
-          end
-          # rubocop:enable Layout/LineLength
-
           include Dry::Configurable
 
           private
diff --git a/lib/dry/system/provider_sources/settings/loader.rb b/lib/dry/system/provider_sources/settings/loader.rb
index e27bd04ee..52d67132c 100644
--- a/lib/dry/system/provider_sources/settings/loader.rb
+++ b/lib/dry/system/provider_sources/settings/loader.rb
@@ -26,12 +26,6 @@ def load_dotenv(root, env)
             require "dotenv"
             Dotenv.load(*dotenv_files(root, env)) if defined?(Dotenv)
           rescue LoadError
-            Dry::Core::Deprecations.announce(
-              "Dry::System :settings provider now requires dotenv to to load settings from .env files`", # rubocop:disable Layout/LineLength
-              "Add `gem \"dotenv\"` to your application's `Gemfile`",
-              tag: "dry-system",
-              uplevel: 3
-            )
             # Do nothing if dotenv is unavailable
           end
 
diff --git a/spec/integration/deprecations/deprecated_bootable_dirs_config_spec.rb b/spec/integration/deprecations/deprecated_bootable_dirs_config_spec.rb
deleted file mode 100644
index c21e89297..000000000
--- a/spec/integration/deprecations/deprecated_bootable_dirs_config_spec.rb
+++ /dev/null
@@ -1,68 +0,0 @@
-# frozen_string_literal: true
-
-RSpec.describe "Deprecated bootable_dirs config" do
-  before do
-    # We don't care about the deprecation messages when we're not testing for them
-    # specifically
-    Dry::Core::Deprecations.set_logger!(StringIO.new)
-  end
-
-  context "no explicit bootable_dirs config" do
-    subject(:container) do
-      module Test
-        class Container < Dry::System::Container
-          configure do |config|
-            config.root = SPEC_ROOT.join("fixtures/deprecations/bootable_dirs_config").realpath
-          end
-        end
-      end
-
-      Test::Container
-    end
-
-    it "uses 'system/boot' if it exists" do
-      container.start :logger
-      expect(container["logger"]).to eq "my logger"
-    end
-
-    it "prints a deprecation notice" do
-      logger = StringIO.new
-      Dry::Core::Deprecations.set_logger! logger
-
-      container.start :logger
-
-      logger.rewind
-      expect(logger.string).to match(/Dry::System::Container\.config\.bootable_dirs.+is deprecated/m)
-    end
-  end
-
-  context "explicit bootable_dirs config" do
-    subject(:container) do
-      module Test
-        class Container < Dry::System::Container
-          configure do |config|
-            config.root = SPEC_ROOT.join("fixtures/deprecations/bootable_dirs_config").realpath
-            config.bootable_dirs = ["system/custom_boot"]
-          end
-        end
-      end
-
-      Test::Container
-    end
-
-    it "uses the bootable_dirs config" do
-      container.start :logger
-      expect(container["logger"]).to eq "my logger"
-    end
-
-    it "prints a deprecation notice" do
-      logger = StringIO.new
-      Dry::Core::Deprecations.set_logger! logger
-
-      container.start :logger
-
-      logger.rewind
-      expect(logger.string).to match(/Dry::System::Container\.config\.bootable_dirs.+is deprecated/m)
-    end
-  end
-end
diff --git a/spec/integration/deprecations/deprecated_container_boot_spec.rb b/spec/integration/deprecations/deprecated_container_boot_spec.rb
deleted file mode 100644
index 8b95d94a2..000000000
--- a/spec/integration/deprecations/deprecated_container_boot_spec.rb
+++ /dev/null
@@ -1,61 +0,0 @@
-# frozen_string_literal: true
-
-RSpec.describe "Deprecated Dry::System::Container.boot" do
-  before do
-    Object.send(:remove_const, :ExternalComponents) if defined? ExternalComponents
-    require SPEC_ROOT.join("fixtures/external_components/lib/external_components")
-
-    # We don't care about the deprecation messages when we're not testing for them
-    # specifically
-    Dry::Core::Deprecations.set_logger!(StringIO.new)
-  end
-
-  subject(:container) do
-    module Test
-      class Container < Dry::System::Container
-        configure do |config|
-          config.root = SPEC_ROOT.join("fixtures/app").realpath
-        end
-
-        boot(:blorp) do
-          start do
-            register "blorp", "my blorp"
-          end
-        end
-
-        boot(:my_logger, from: :external_components, key: :logger) do
-          configure do |config|
-            config.log_level = :debug
-          end
-
-          after(:start) do
-            register(:my_logger, container[:logger])
-          end
-        end
-      end
-    end
-
-    Test::Container
-  end
-
-  it "registers a provider via .register_provider" do
-    expect(container["blorp"]).to eq "my blorp"
-  end
-
-  it "registers a provider using a provider source" do
-    my_logger = container[:my_logger]
-
-    expect(my_logger).to be_instance_of(ExternalComponents::Logger)
-    expect(my_logger.log_level).to be(:debug)
-  end
-
-  it "prints deprecation warnings" do
-    logger = StringIO.new
-    Dry::Core::Deprecations.set_logger! logger
-
-    container.finalize!
-
-    logger.rewind
-    expect(logger.string).to match(/Container\.boot is deprecated.*Container\.boot is deprecated/m)
-  end
-end
diff --git a/spec/integration/deprecations/deprecated_container_import_spec.rb b/spec/integration/deprecations/deprecated_container_import_spec.rb
deleted file mode 100644
index deaf85df1..000000000
--- a/spec/integration/deprecations/deprecated_container_import_spec.rb
+++ /dev/null
@@ -1,43 +0,0 @@
-# frozen_string_literal: true
-
-RSpec.describe "Deprecated Dry::System::Container.import" do
-  before do
-    Object.send(:remove_const, :ExternalComponents) if defined? ExternalComponents
-    require SPEC_ROOT.join("fixtures/external_components/lib/external_components")
-
-    # We don't care about the deprecation messages when we're not testing for them
-    # specifically
-    Dry::Core::Deprecations.set_logger!(StringIO.new)
-  end
-
-  describe "container imports" do
-    let(:exporting_container) {
-      Class.new(Dry::System::Container) {
-        register "foo", "foo"
-      }
-    }
-
-    let(:importing_container) {
-      exporting_container = self.exporting_container
-
-      Class.new(Dry::System::Container) {
-        import other: exporting_container, again: exporting_container
-      }
-    }
-
-    it "registers the container for import" do
-      expect(importing_container["other.foo"]).to eq "foo"
-      expect(importing_container["again.foo"]).to eq "foo"
-    end
-
-    it "prints deprecation warnings" do
-      logger = StringIO.new
-      Dry::Core::Deprecations.set_logger! logger
-
-      importing_container
-
-      logger.rewind
-      expect(logger.string).to match(/Dry::System::Container\.import with \{namespace => container\} hash is deprecated/m)
-    end
-  end
-end
diff --git a/spec/integration/deprecations/deprecated_external_providers_and_components_spec.rb b/spec/integration/deprecations/deprecated_external_providers_and_components_spec.rb
deleted file mode 100644
index b8511e5cd..000000000
--- a/spec/integration/deprecations/deprecated_external_providers_and_components_spec.rb
+++ /dev/null
@@ -1,52 +0,0 @@
-# frozen_string_literal: true
-
-RSpec.describe "Deprecated Dry::System.register_provider and Dry::System.register_component" do
-  before do
-    Object.send(:remove_const, :ExternalComponents) if defined? ExternalComponents
-
-    # We don't care about the deprecation messages when we're not testing for them
-    # specifically
-    Dry::Core::Deprecations.set_logger!(StringIO.new)
-  end
-
-  subject(:container) do
-    module Test
-      class Container < Dry::System::Container
-        configure do |config|
-          config.root = SPEC_ROOT.join("fixtures/app").realpath
-        end
-
-        register_provider(:my_logger, from: :external_components, source: :logger) do
-          configure do |config|
-            config.log_level = :debug
-          end
-
-          after(:start) do
-            register(:my_logger, resolve(:logger))
-          end
-        end
-      end
-    end
-
-    Test::Container
-  end
-
-  it "registers provider sources for the external components" do
-    require SPEC_ROOT.join("fixtures/external_components_deprecated/lib/external_components")
-
-    my_logger = container[:my_logger]
-
-    expect(my_logger).to be_instance_of(ExternalComponents::Logger)
-    expect(my_logger.log_level).to be(:debug)
-  end
-
-  it "prints deprecation warnings" do
-    logger = StringIO.new
-    Dry::Core::Deprecations.set_logger! logger
-
-    require SPEC_ROOT.join("fixtures/external_components_deprecated/lib/external_components")
-
-    logger.rewind
-    expect(logger.string).to match(/Dry::System\.register_provider is deprecated.*Dry::System\.register_component is deprecated/m)
-  end
-end
diff --git a/spec/integration/deprecations/deprecated_provider_block_args_spec.rb b/spec/integration/deprecations/deprecated_provider_block_args_spec.rb
deleted file mode 100644
index e663b00c7..000000000
--- a/spec/integration/deprecations/deprecated_provider_block_args_spec.rb
+++ /dev/null
@@ -1,44 +0,0 @@
-# frozen_string_literal: true
-
-RSpec.describe "Deprecated register_provider block arg" do
-  before do
-    Object.send(:remove_const, :ExternalComponents) if defined? ExternalComponents
-    require SPEC_ROOT.join("fixtures/external_components/lib/external_components")
-
-    # We don't care about the deprecation messages when we're not testing for them
-    # specifically
-    Dry::Core::Deprecations.set_logger!(StringIO.new)
-  end
-
-  subject(:container) {
-    module Test
-      class Container < Dry::System::Container
-        configure do |config|
-          config.root = __dir__
-        end
-
-        register_provider(:blorp) do |arg1|
-          init do
-            arg1.register "blorp", "my blorp"
-          end
-        end
-      end
-    end
-
-    Test::Container
-  }
-
-  it "still allows access to the target container via a register_provider block arg" do
-    expect(container["blorp"]).to eq "my blorp"
-  end
-
-  it "prints a deprecation notice" do
-    logger = StringIO.new
-    Dry::Core::Deprecations.set_logger! logger
-
-    container.init :blorp
-
-    logger.rewind
-    expect(logger.string).to match(/Dry::System.register_provider with single block parameter is deprecated.*Use `target_container` \(or `target` for short\) inside your block instead/m)
-  end
-end
diff --git a/spec/integration/deprecations/deprecated_provider_callback_block_args_spec.rb b/spec/integration/deprecations/deprecated_provider_callback_block_args_spec.rb
deleted file mode 100644
index bc6672873..000000000
--- a/spec/integration/deprecations/deprecated_provider_callback_block_args_spec.rb
+++ /dev/null
@@ -1,48 +0,0 @@
-# frozen_string_literal: true
-
-RSpec.describe "Deprecated provider callback block arg" do
-  before do
-    Object.send(:remove_const, :ExternalComponents) if defined? ExternalComponents
-    require SPEC_ROOT.join("fixtures/external_components/lib/external_components")
-
-    # We don't care about the deprecation messages when we're not testing for them
-    # specifically
-    Dry::Core::Deprecations.set_logger!(StringIO.new)
-  end
-
-  subject(:container) {
-    module Test
-      class Container < Dry::System::Container
-        configure do |config|
-          config.root = SPEC_ROOT.join("fixtures/app").realpath
-        end
-
-        register_provider(:my_logger, from: :external_components, source: :logger) do
-          configure do |config|
-            config.log_level = :debug
-          end
-
-          after(:start) do |arg1|
-            arg1.register(:my_logger, arg1.resolve(:logger))
-          end
-        end
-      end
-    end
-
-    Test::Container
-  }
-
-  it "still allows access to the provider container via a provider step callback block arg" do
-    expect(container[:my_logger]).to be_instance_of(ExternalComponents::Logger)
-  end
-
-  it "prints a deprecation notice" do
-    logger = StringIO.new
-    Dry::Core::Deprecations.set_logger! logger
-
-    container.start(:my_logger)
-
-    logger.rewind
-    expect(logger.string).to match(/Dry::System::Provider::Source.before and .after callbacks with single block parameter is deprecated.*Use `provider_container` \(or `container` for short\) inside your block instead/m)
-  end
-end
diff --git a/spec/integration/deprecations/deprecated_provider_init_event_spec.rb b/spec/integration/deprecations/deprecated_provider_init_event_spec.rb
deleted file mode 100644
index 90fa68d61..000000000
--- a/spec/integration/deprecations/deprecated_provider_init_event_spec.rb
+++ /dev/null
@@ -1,96 +0,0 @@
-# frozen_string_literal: true
-
-RSpec.describe "Deprecated provider init event" do
-  before do
-    Object.send(:remove_const, :ExternalComponents) if defined? ExternalComponents
-    require SPEC_ROOT.join("fixtures/external_components/lib/external_components")
-
-    # We don't care about the deprecation messages when we're not testing for them
-    # specifically
-    Dry::Core::Deprecations.set_logger!(StringIO.new)
-  end
-
-  subject(:container) do
-    module Test
-      class Container < Dry::System::Container
-        configure do |config|
-          config.root = SPEC_ROOT.join("fixtures/app").realpath
-        end
-
-        register_provider(:blorp) do
-          init do
-            register "blorp", "my blorp"
-          end
-        end
-
-        register_provider(:my_logger, from: :external_components, source: :logger) do
-          configure do |config|
-            config.log_level = :debug
-          end
-
-          before(:init) do
-            register "before_init", "my before init"
-          end
-
-          after(:init) do
-            register "after_init", "my after init"
-          end
-        end
-      end
-    end
-
-    Test::Container
-  end
-
-  describe "init event in provider lifecycle" do
-    it "uses the prepare event" do
-      container.prepare :blorp
-      expect(container.registered?("blorp")).to be true
-    end
-
-    it "prints a deprecation notice" do
-      logger = StringIO.new
-      Dry::Core::Deprecations.set_logger! logger
-
-      container.init :blorp
-
-      logger.rewind
-      expect(logger.string).to match(/Dry::System::Provider::SourceDSL.*#init is deprecated/m)
-    end
-  end
-
-  describe "before/after init triggers in providers using provider sources" do
-    it "triggers the hooks around the prepare event" do
-      container.prepare :my_logger
-      expect(container["before_init"]).to eq "my before init"
-      expect(container["after_init"]).to eq "my after init"
-    end
-
-    it "prints a deprecation notice" do
-      logger = StringIO.new
-      Dry::Core::Deprecations.set_logger! logger
-
-      container.prepare :my_logger
-
-      logger.rewind
-      expect(logger.string).to match(/Dry::System::Provider before\(:init\) callback is deprecated.*Dry::System::Provider after\(:init\) callback is deprecated/m)
-    end
-  end
-
-  describe "Container.init" do
-    it "forwards to Container.prepare" do
-      container.init :blorp
-      expect(container.registered?("blorp")).to be true
-    end
-
-    it "prints a deprecation notice" do
-      logger = StringIO.new
-      Dry::Core::Deprecations.set_logger! logger
-
-      container.init :blorp
-
-      logger.rewind
-      expect(logger.string).to match(/Dry::System::Container.*#init is deprecated/m)
-    end
-  end
-end
diff --git a/spec/integration/deprecations/deprecated_provider_settings_block_spec.rb b/spec/integration/deprecations/deprecated_provider_settings_block_spec.rb
deleted file mode 100644
index be42d9f07..000000000
--- a/spec/integration/deprecations/deprecated_provider_settings_block_spec.rb
+++ /dev/null
@@ -1,48 +0,0 @@
-# frozen_string_literal: true
-
-RSpec.describe "Deprecated provider settings block" do
-  before do
-    # We don't care about the deprecation messages when we're not testing for them
-    # specifically
-    Dry::Core::Deprecations.set_logger!(StringIO.new)
-  end
-
-  subject(:container) {
-    module Test
-      class Container < Dry::System::Container
-        configure do |config|
-          config.root = __dir__
-        end
-
-        Dry::System.register_provider_source(:some_provider, group: :some_group) do
-          settings do
-            key :some_int, Dry::Types["coercible.integer"]
-          end
-        end
-
-        register_provider(:my_provider, from: :some_group, source: :some_provider) do
-          configure do |config|
-            config.some_int = "12"
-          end
-        end
-      end
-    end
-
-    Test::Container
-  }
-
-  it "uses the block to declare settings" do
-    container.start :my_provider
-    expect(container.providers[:my_provider].source.config.to_h).to eq(some_int: 12)
-  end
-
-  it "prints a deprecation notice" do
-    logger = StringIO.new
-    Dry::Core::Deprecations.set_logger! logger
-
-    container
-
-    logger.rewind
-    expect(logger.string).to match(/Dry::System.register_provider with nested settings block is deprecated.*Use individual top-level `setting` declarations instead/m)
-  end
-end
diff --git a/spec/integration/deprecations/deprecated_provider_use_spec.rb b/spec/integration/deprecations/deprecated_provider_use_spec.rb
deleted file mode 100644
index 35edac431..000000000
--- a/spec/integration/deprecations/deprecated_provider_use_spec.rb
+++ /dev/null
@@ -1,55 +0,0 @@
-# frozen_string_literal: true
-
-RSpec.describe "Deprecated Provider#use" do
-  before do
-    # We don't care about the deprecation messages when we're not testing for them
-    # specifically
-    Dry::Core::Deprecations.set_logger!(StringIO.new)
-  end
-
-  subject(:container) {
-    module Test
-      class Container < Dry::System::Container
-        configure do |config|
-          config.root = __dir__
-        end
-
-        register_provider(:use_1) do
-          start do
-            register "use_1", "use_1"
-          end
-        end
-
-        register_provider(:use_2) do
-          start do
-            register "use_2", "use_2"
-          end
-        end
-
-        register_provider(:blorp) do
-          start do
-            use :use_1, :use_2
-          end
-        end
-      end
-    end
-
-    Test::Container
-  }
-
-  it "starts the given providers" do
-    expect { container.start :blorp }
-      .to change { container.registered?("use_1") }.to(true)
-      .and change { container.registered?("use_2") }.to(true)
-  end
-
-  it "prints a deprecation notice" do
-    logger = StringIO.new
-    Dry::Core::Deprecations.set_logger! logger
-
-    container.start :blorp
-
-    logger.rewind
-    expect(logger.string).to match(/Dry::System::Provider#use is deprecated.*Use `target_container.start` instead/m)
-  end
-end
diff --git a/spec/integration/deprecations/deprecated_settings_provider_source_key_spec.rb b/spec/integration/deprecations/deprecated_settings_provider_source_key_spec.rb
deleted file mode 100644
index 381ccccc9..000000000
--- a/spec/integration/deprecations/deprecated_settings_provider_source_key_spec.rb
+++ /dev/null
@@ -1,54 +0,0 @@
-# frozen_string_literal: true
-
-require "dry/system/provider_sources"
-
-RSpec.describe "Deprecated :settings provider source `key`" do
-  before do
-    # We don't care about the deprecation messages when we're not testing for them
-    # specifically
-    Dry::Core::Deprecations.set_logger!(StringIO.new)
-  end
-
-  subject(:container) {
-    module Test
-      class Container < Dry::System::Container
-        setting :env
-
-        configure do |config|
-          config.root = __dir__
-          config.env = :development
-        end
-
-        register_provider(:settings, from: :dry_system) do
-          settings do
-            key :some_int_using_deprecated_key, Dry::Types["coercible.integer"]
-          end
-        end
-      end
-    end
-
-    Test::Container
-  }
-
-  before do
-    ENV["SOME_INT_USING_DEPRECATED_KEY"] = "5"
-  end
-
-  after do
-    ENV.delete("SOME_INT_USING_DEPRECATED_KEY")
-  end
-
-  it "defines the setting" do
-    expect(container[:settings].some_int_using_deprecated_key).to eq 5
-  end
-
-  it "prints a deprecation notice" do
-    logger = StringIO.new
-    Dry::Core::Deprecations.set_logger! logger
-
-    container.start(:settings)
-
-    logger.rewind
-    expect(logger.string).to match(/Dry::System :settings provider source setting definition using `key`.*Use `setting` instead, with dry-configurable `setting` options/m)
-  end
-end
diff --git a/spec/unit/config/component_dir_spec.rb b/spec/unit/config/component_dir_spec.rb
deleted file mode 100644
index 0099699de..000000000
--- a/spec/unit/config/component_dir_spec.rb
+++ /dev/null
@@ -1,86 +0,0 @@
-# frozen_string_literal: true
-
-require "dry/system/config/component_dir"
-
-RSpec.describe Dry::System::Config::ComponentDir do
-  subject(:component_dir) { described_class.new("some_path") }
-
-  describe "#default_namespace= (deprecated)" do
-    before do
-      # We don't care about the deprecation messages when we're not testing for them
-      # specifically
-      Dry::Core::Deprecations.set_logger!(StringIO.new)
-    end
-
-    it "adds a corresponding namespace object" do
-      expect { component_dir.default_namespace = "admin" }
-        .to change { component_dir.namespaces.namespaces.keys.to_a.length }
-        .from(0).to(1)
-
-      added_namespace = component_dir.namespaces.namespaces["admin"]
-
-      expect(added_namespace).to be
-      expect(added_namespace.path).to eq "admin"
-      expect(added_namespace.key).to eq nil
-      expect(added_namespace.const).to eq "admin"
-    end
-
-    it "converts dot-delimited namespace strings to equivalent paths" do
-      component_dir.default_namespace = "nested.admin"
-
-      added_namespace = component_dir.namespaces.namespaces["nested/admin"]
-
-      expect(added_namespace).to be
-      expect(added_namespace.path).to eq "nested/admin"
-      expect(added_namespace.key).to eq nil
-      expect(added_namespace.const).to eq "nested/admin"
-    end
-
-    it "adds the namespace object only once" do
-      expect {
-        component_dir.default_namespace = "admin"
-        component_dir.default_namespace = "admin"
-      }
-        .to change { component_dir.namespaces.namespaces.keys.to_a.length }
-        .from(0).to(1)
-    end
-
-    it "prints a deprecation warning" do
-      logger = StringIO.new
-      Dry::Core::Deprecations.set_logger! logger
-
-      component_dir.default_namespace = "admin"
-
-      logger.rewind
-      expect(logger.string).to match(/ComponentDir#default_namespace= is deprecated/)
-    end
-  end
-
-  describe "#default_namespace (deprecated)" do
-    before do
-      # We don't care about the deprecation messages when we're not testing for them
-      # specifically
-      Dry::Core::Deprecations.set_logger!(StringIO.new)
-    end
-
-    it "is nil by default" do
-      expect(component_dir.default_namespace).to be_nil
-    end
-
-    it "returns the dot-delimited leading identifier string for the first configured namespace" do
-      component_dir.default_namespace = "nested.admin"
-
-      expect(component_dir.default_namespace).to eq "nested.admin"
-    end
-
-    it "prints a deprecation warning" do
-      logger = StringIO.new
-      Dry::Core::Deprecations.set_logger! logger
-
-      component_dir.default_namespace
-
-      logger.rewind
-      expect(logger.string).to match(/ComponentDir#default_namespace is deprecated/)
-    end
-  end
-end
diff --git a/spec/unit/config/namespaces_spec.rb b/spec/unit/config/namespaces_spec.rb
index bcbae53a8..59fc61789 100644
--- a/spec/unit/config/namespaces_spec.rb
+++ b/spec/unit/config/namespaces_spec.rb
@@ -42,39 +42,6 @@
     end
   end
 
-  describe "#root with argumments (DEPRECATED for #add_root)" do
-    before do
-      # We don't care about the deprecation messages when we're not testing for them
-      # specifically
-      Dry::Core::Deprecations.set_logger!(StringIO.new)
-    end
-
-    it "adds a root namespace with the given configuration" do
-      expect {
-        namespaces.root key: "key_ns", const: "const_ns"
-      }
-        .to change { namespaces.length }
-        .from(0).to(1)
-
-      ns = namespaces.namespaces[nil]
-
-      expect(ns).to be_root
-      expect(ns.path).to be_nil
-      expect(ns.key).to eq "key_ns"
-      expect(ns.const).to eq "const_ns"
-    end
-
-    it "prints a deprecation warning" do
-      logger = StringIO.new
-      Dry::Core::Deprecations.set_logger! logger
-
-      namespaces.root key: "key_ns", const: "const_ns"
-
-      logger.rewind
-      expect(logger.string).to match(/Namespaces#root \(with arguments\) is deprecated/)
-    end
-  end
-
   describe "#add" do
     it "adds the namespace with the given configuration" do
       expect {
diff --git a/spec/unit/provider/source_spec.rb b/spec/unit/provider/source_spec.rb
index d9153611d..ab4c0dead 100644
--- a/spec/unit/provider/source_spec.rb
+++ b/spec/unit/provider/source_spec.rb
@@ -28,7 +28,7 @@
   context "using a base class" do
     it_behaves_like "a provider class" do
       let(:provider_class) do
-        described_class.for(name: "Persistence", target_container: target_container) do
+        described_class.for(name: "Persistence") do
           start do
             register(:persistence, {})
           end
@@ -40,7 +40,7 @@
   context "using a sub-class" do
     it_behaves_like "a provider class" do
       let(:parent_class) do
-        described_class.for(name: "Persistence", target_container: target_container) do
+        described_class.for(name: "Persistence") do
           start do
             register(:persistence, {})
           end