diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index fb2b746..87f5c12 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
 
     steps:
     - uses: actions/checkout@v1
@@ -25,7 +25,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install 'tox<5' tox-gh-actions 'poetry>=1.4,<1.5'
+        pip install 'tox<5' tox-gh-actions 'poetry>=1.5,<1.6'
     - name: Test with tox
       run: tox
 
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index d16d054..cab7279 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,13 @@
 Changelog
 =========
 
+0.17.0 (2023-07-31)
+-------------------
+
+- Drop Python 3.7 support.
+- Remove ``typing-extensions`` and ``importlib_metadata`` dependencies.
+- More robust checks to prevent ``Protocol`` false positives.
+
 0.16.5 (2023-03-01)
 -------------------
 
diff --git a/docs/advanced.rst b/docs/advanced.rst
index 80a6213..a933a2b 100644
--- a/docs/advanced.rst
+++ b/docs/advanced.rst
@@ -18,7 +18,7 @@ Use the following configuration:
 
    repos:
    - repo: https://github.com/ariebovenberg/slotscheck
-     rev: v0.16.5
+     rev: v0.17.0
      hooks:
      - id: slotscheck
        # If your Python files are not importable from the project root,
diff --git a/poetry.lock b/poetry.lock
index 4f949ab..2fc9b12 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -2,36 +2,33 @@
 
 [[package]]
 name = "black"
-version = "23.3.0"
+version = "23.7.0"
 description = "The uncompromising code formatter."
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.8"
 files = [
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-    {file = "black-23.3.0-cp310-cp310-macosx_10_16_universal2.whl", hash = "sha256:67de8d0c209eb5b330cce2469503de11bca4085880d62f1628bd9972cc3366b9"},
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+    {file = "black-23.7.0-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:642496b675095d423f9b8448243336f8ec71c9d4d57ec17bf795b67f08132a91"},
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+    {file = "black-23.7.0-py3-none-any.whl", hash = "sha256:9fd59d418c60c0348505f2ddf9609c1e1de8e7493eab96198fc89d9f865e7a96"},
+    {file = "black-23.7.0.tar.gz", hash = "sha256:022a582720b0d9480ed82576c920a8c1dde97cc38ff11d8d8859b3bd6ca9eedb"},
 ]
 
 [package.dependencies]
@@ -41,7 +38,6 @@ packaging = ">=22.0"
 pathspec = ">=0.9.0"
 platformdirs = ">=2"
 tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
-typed-ast = {version = ">=1.4.2", markers = "python_version < \"3.8\" and implementation_name == \"cpython\""}
 typing-extensions = {version = ">=3.10.0.0", markers = "python_version < \"3.10\""}
 
 [package.extras]
@@ -63,7 +59,6 @@ files = [
 
 [package.dependencies]
 colorama = {version = "*", markers = "platform_system == \"Windows\""}
-importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 
 [[package]]
 name = "colorama"
@@ -78,62 +73,71 @@ files = [
 
 [[package]]
 name = "coverage"
-version = "7.2.3"
+version = "7.2.7"
 description = "Code coverage measurement for Python"
 optional = false
 python-versions = ">=3.7"
 files = [
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 [package.dependencies]
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@@ -158,39 +162,19 @@ test = ["pytest (>=6)"]
 
 [[package]]
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+version = "6.1.0"
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 [[package]]
 name = "iniconfig"
@@ -205,17 +189,17 @@ files = [
 
 [[package]]
 name = "isort"
-version = "5.11.5"
+version = "5.12.0"
 description = "A Python utility / library to sort Python imports."
 optional = false
-python-versions = ">=3.7.0"
+python-versions = ">=3.8.0"
 files = [
-    {file = "isort-5.11.5-py3-none-any.whl", hash = "sha256:ba1d72fb2595a01c7895a5128f9585a5cc4b6d395f1c8d514989b9a7eb2a8746"},
-    {file = "isort-5.11.5.tar.gz", hash = "sha256:6be1f76a507cb2ecf16c7cf14a37e41609ca082330be4e3436a18ef74add55db"},
+    {file = "isort-5.12.0-py3-none-any.whl", hash = "sha256:f84c2818376e66cf843d497486ea8fed8700b340f308f076c6fb1229dff318b6"},
+    {file = "isort-5.12.0.tar.gz", hash = "sha256:8bef7dde241278824a6d83f44a544709b065191b95b6e50894bdc722fcba0504"},
 ]
 
 [package.extras]
-colors = ["colorama (>=0.4.3,<0.5.0)"]
+colors = ["colorama (>=0.4.3)"]
 pipfile-deprecated-finder = ["pip-shims (>=0.5.2)", "pipreqs", "requirementslib"]
 plugins = ["setuptools"]
 requirements-deprecated-finder = ["pip-api", "pipreqs"]
@@ -269,7 +253,6 @@ files = [
 [package.dependencies]
 mypy-extensions = ">=1.0.0"
 tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
-typed-ast = {version = ">=1.4.0,<2", markers = "python_version < \"3.8\""}
 typing-extensions = ">=4.1.0"
 
 [package.extras]
@@ -291,71 +274,65 @@ files = [
 
 [[package]]
 name = "packaging"
-version = "23.0"
+version = "23.1"
 description = "Core utilities for Python packages"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "packaging-23.0-py3-none-any.whl", hash = "sha256:714ac14496c3e68c99c29b00845f7a2b85f3bb6f1078fd9f72fd20f0570002b2"},
-    {file = "packaging-23.0.tar.gz", hash = "sha256:b6ad297f8907de0fa2fe1ccbd26fdaf387f5f47c7275fedf8cce89f99446cf97"},
+    {file = "packaging-23.1-py3-none-any.whl", hash = "sha256:994793af429502c4ea2ebf6bf664629d07c1a9fe974af92966e4b8d2df7edc61"},
+    {file = "packaging-23.1.tar.gz", hash = "sha256:a392980d2b6cffa644431898be54b0045151319d1e7ec34f0cfed48767dd334f"},
 ]
 
 [[package]]
 name = "pathspec"
-version = "0.11.1"
+version = "0.11.2"
 description = "Utility library for gitignore style pattern matching of file paths."
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "pathspec-0.11.1-py3-none-any.whl", hash = "sha256:d8af70af76652554bd134c22b3e8a1cc46ed7d91edcdd721ef1a0c51a84a5293"},
-    {file = "pathspec-0.11.1.tar.gz", hash = "sha256:2798de800fa92780e33acca925945e9a19a133b715067cf165b8866c15a31687"},
+    {file = "pathspec-0.11.2-py3-none-any.whl", hash = "sha256:1d6ed233af05e679efb96b1851550ea95bbb64b7c490b0f5aa52996c11e92a20"},
+    {file = "pathspec-0.11.2.tar.gz", hash = "sha256:e0d8d0ac2f12da61956eb2306b69f9469b42f4deb0f3cb6ed47b9cce9996ced3"},
 ]
 
 [[package]]
 name = "platformdirs"
-version = "3.2.0"
+version = "3.10.0"
 description = "A small Python package for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "platformdirs-3.2.0-py3-none-any.whl", hash = "sha256:ebe11c0d7a805086e99506aa331612429a72ca7cd52a1f0d277dc4adc20cb10e"},
-    {file = "platformdirs-3.2.0.tar.gz", hash = "sha256:d5b638ca397f25f979350ff789db335903d7ea010ab28903f57b27e1b16c2b08"},
+    {file = "platformdirs-3.10.0-py3-none-any.whl", hash = "sha256:d7c24979f292f916dc9cbf8648319032f551ea8c49a4c9bf2fb556a02070ec1d"},
+    {file = "platformdirs-3.10.0.tar.gz", hash = "sha256:b45696dab2d7cc691a3226759c0d3b00c47c8b6e293d96f6436f733303f77f6d"},
 ]
 
-[package.dependencies]
-typing-extensions = {version = ">=4.5", markers = "python_version < \"3.8\""}
-
 [package.extras]
-docs = ["furo (>=2022.12.7)", "proselint (>=0.13)", "sphinx (>=6.1.3)", "sphinx-autodoc-typehints (>=1.22,!=1.23.4)"]
-test = ["appdirs (==1.4.4)", "covdefaults (>=2.3)", "pytest (>=7.2.2)", "pytest-cov (>=4)", "pytest-mock (>=3.10)"]
+docs = ["furo (>=2023.7.26)", "proselint (>=0.13)", "sphinx (>=7.1.1)", "sphinx-autodoc-typehints (>=1.24)"]
+test = ["appdirs (==1.4.4)", "covdefaults (>=2.3)", "pytest (>=7.4)", "pytest-cov (>=4.1)", "pytest-mock (>=3.11.1)"]
 
 [[package]]
 name = "pluggy"
-version = "1.0.0"
+version = "1.2.0"
 description = "plugin and hook calling mechanisms for python"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.7"
 files = [
-    {file = "pluggy-1.0.0-py2.py3-none-any.whl", hash = "sha256:74134bbf457f031a36d68416e1509f34bd5ccc019f0bcc952c7b909d06b37bd3"},
-    {file = "pluggy-1.0.0.tar.gz", hash = "sha256:4224373bacce55f955a878bf9cfa763c1e360858e330072059e10bad68531159"},
+    {file = "pluggy-1.2.0-py3-none-any.whl", hash = "sha256:c2fd55a7d7a3863cba1a013e4e2414658b1d07b6bc57b3919e0c63c9abb99849"},
+    {file = "pluggy-1.2.0.tar.gz", hash = "sha256:d12f0c4b579b15f5e054301bb226ee85eeeba08ffec228092f8defbaa3a4c4b3"},
 ]
 
-[package.dependencies]
-importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
-
 [package.extras]
 dev = ["pre-commit", "tox"]
 testing = ["pytest", "pytest-benchmark"]
 
 [[package]]
 name = "pycodestyle"
-version = "2.9.1"
+version = "2.11.0"
 description = "Python style guide checker"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.8"
 files = [
-    {file = "pycodestyle-2.9.1-py2.py3-none-any.whl", hash = "sha256:d1735fc58b418fd7c5f658d28d943854f8a849b01a5d0a1e6f3f3fdd0166804b"},
-    {file = "pycodestyle-2.9.1.tar.gz", hash = "sha256:2c9607871d58c76354b697b42f5d57e1ada7d261c261efac224b664affdc5785"},
+    {file = "pycodestyle-2.11.0-py2.py3-none-any.whl", hash = "sha256:5d1013ba8dc7895b548be5afb05740ca82454fd899971563d2ef625d090326f8"},
+    {file = "pycodestyle-2.11.0.tar.gz", hash = "sha256:259bcc17857d8a8b3b4a2327324b79e5f020a13c16074670f9c8c8f872ea76d0"},
 ]
 
 [[package]]
@@ -411,13 +388,13 @@ email = ["email-validator (>=1.0.3)"]
 
 [[package]]
 name = "pyflakes"
-version = "2.5.0"
+version = "3.1.0"
 description = "passive checker of Python programs"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.8"
 files = [
-    {file = "pyflakes-2.5.0-py2.py3-none-any.whl", hash = "sha256:4579f67d887f804e67edb544428f264b7b24f435b263c4614f384135cea553d2"},
-    {file = "pyflakes-2.5.0.tar.gz", hash = "sha256:491feb020dca48ccc562a8c0cbe8df07ee13078df59813b83959cbdada312ea3"},
+    {file = "pyflakes-3.1.0-py2.py3-none-any.whl", hash = "sha256:4132f6d49cb4dae6819e5379898f2b8cce3c5f23994194c24b77d5da2e36f774"},
+    {file = "pyflakes-3.1.0.tar.gz", hash = "sha256:a0aae034c444db0071aa077972ba4768d40c830d9539fd45bf4cd3f8f6992efc"},
 ]
 
 [[package]]
@@ -434,7 +411,6 @@ files = [
 [package.dependencies]
 colorama = {version = "*", markers = "sys_platform == \"win32\""}
 exceptiongroup = {version = ">=1.0.0rc8", markers = "python_version < \"3.11\""}
-importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 iniconfig = "*"
 packaging = "*"
 pluggy = ">=0.12,<2.0"
@@ -489,39 +465,6 @@ files = [
     {file = "tomli-2.0.1.tar.gz", hash = "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"},
 ]
 
-[[package]]
-name = "typed-ast"
-version = "1.5.4"
-description = "a fork of Python 2 and 3 ast modules with type comment support"
-optional = false
-python-versions = ">=3.6"
-files = [
-    {file = "typed_ast-1.5.4-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:669dd0c4167f6f2cd9f57041e03c3c2ebf9063d0757dc89f79ba1daa2bfca9d4"},
-    {file = "typed_ast-1.5.4-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:211260621ab1cd7324e0798d6be953d00b74e0428382991adfddb352252f1d62"},
-    {file = "typed_ast-1.5.4-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:267e3f78697a6c00c689c03db4876dd1efdfea2f251a5ad6555e82a26847b4ac"},
-    {file = "typed_ast-1.5.4-cp310-cp310-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:c542eeda69212fa10a7ada75e668876fdec5f856cd3d06829e6aa64ad17c8dfe"},
-    {file = "typed_ast-1.5.4-cp310-cp310-win_amd64.whl", hash = "sha256:a9916d2bb8865f973824fb47436fa45e1ebf2efd920f2b9f99342cb7fab93f72"},
-    {file = "typed_ast-1.5.4-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:79b1e0869db7c830ba6a981d58711c88b6677506e648496b1f64ac7d15633aec"},
-    {file = "typed_ast-1.5.4-cp36-cp36m-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:a94d55d142c9265f4ea46fab70977a1944ecae359ae867397757d836ea5a3f47"},
-    {file = "typed_ast-1.5.4-cp36-cp36m-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:183afdf0ec5b1b211724dfef3d2cad2d767cbefac291f24d69b00546c1837fb6"},
-    {file = "typed_ast-1.5.4-cp36-cp36m-win_amd64.whl", hash = "sha256:639c5f0b21776605dd6c9dbe592d5228f021404dafd377e2b7ac046b0349b1a1"},
-    {file = "typed_ast-1.5.4-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:cf4afcfac006ece570e32d6fa90ab74a17245b83dfd6655a6f68568098345ff6"},
-    {file = "typed_ast-1.5.4-cp37-cp37m-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:ed855bbe3eb3715fca349c80174cfcfd699c2f9de574d40527b8429acae23a66"},
-    {file = "typed_ast-1.5.4-cp37-cp37m-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:6778e1b2f81dfc7bc58e4b259363b83d2e509a65198e85d5700dfae4c6c8ff1c"},
-    {file = "typed_ast-1.5.4-cp37-cp37m-win_amd64.whl", hash = "sha256:0261195c2062caf107831e92a76764c81227dae162c4f75192c0d489faf751a2"},
-    {file = "typed_ast-1.5.4-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:2efae9db7a8c05ad5547d522e7dbe62c83d838d3906a3716d1478b6c1d61388d"},
-    {file = "typed_ast-1.5.4-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:7d5d014b7daa8b0bf2eaef684295acae12b036d79f54178b92a2b6a56f92278f"},
-    {file = "typed_ast-1.5.4-cp38-cp38-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:370788a63915e82fd6f212865a596a0fefcbb7d408bbbb13dea723d971ed8bdc"},
-    {file = "typed_ast-1.5.4-cp38-cp38-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:4e964b4ff86550a7a7d56345c7864b18f403f5bd7380edf44a3c1fb4ee7ac6c6"},
-    {file = "typed_ast-1.5.4-cp38-cp38-win_amd64.whl", hash = "sha256:683407d92dc953c8a7347119596f0b0e6c55eb98ebebd9b23437501b28dcbb8e"},
-    {file = "typed_ast-1.5.4-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:4879da6c9b73443f97e731b617184a596ac1235fe91f98d279a7af36c796da35"},
-    {file = "typed_ast-1.5.4-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:3e123d878ba170397916557d31c8f589951e353cc95fb7f24f6bb69adc1a8a97"},
-    {file = "typed_ast-1.5.4-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:ebd9d7f80ccf7a82ac5f88c521115cc55d84e35bf8b446fcd7836eb6b98929a3"},
-    {file = "typed_ast-1.5.4-cp39-cp39-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:98f80dee3c03455e92796b58b98ff6ca0b2a6f652120c263efdba4d6c5e58f72"},
-    {file = "typed_ast-1.5.4-cp39-cp39-win_amd64.whl", hash = "sha256:0fdbcf2fef0ca421a3f5912555804296f0b0960f0418c440f5d6d3abb549f3e1"},
-    {file = "typed_ast-1.5.4.tar.gz", hash = "sha256:39e21ceb7388e4bb37f4c679d72707ed46c2fbf2a5609b8b8ebc4b067d977df2"},
-]
-
 [[package]]
 name = "typing-extensions"
 version = "4.7.1"
@@ -533,22 +476,7 @@ files = [
     {file = "typing_extensions-4.7.1.tar.gz", hash = "sha256:b75ddc264f0ba5615db7ba217daeb99701ad295353c45f9e95963337ceeeffb2"},
 ]
 
-[[package]]
-name = "zipp"
-version = "3.15.0"
-description = "Backport of pathlib-compatible object wrapper for zip files"
-optional = false
-python-versions = ">=3.7"
-files = [
-    {file = "zipp-3.15.0-py3-none-any.whl", hash = "sha256:48904fc76a60e542af151aded95726c1a5c34ed43ab4134b597665c86d7ad556"},
-    {file = "zipp-3.15.0.tar.gz", hash = "sha256:112929ad649da941c23de50f356a2b5570c954b65150642bccdd66bf194d224b"},
-]
-
-[package.extras]
-docs = ["furo", "jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx (>=3.5)", "sphinx-lint"]
-testing = ["big-O", "flake8 (<5)", "jaraco.functools", "jaraco.itertools", "more-itertools", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)"]
-
 [metadata]
 lock-version = "2.0"
-python-versions = ">=3.7,<4"
-content-hash = "cc21c023e3ad1676112e3a2617dd29e89f07bfb28a8d167a39421bc0c39ebde8"
+python-versions = ">=3.8.1,<4"
+content-hash = "450ec33a72181fd376756d570bae26950f6eac16e5823cd34d266f6cfaa719a8"
diff --git a/pyproject.toml b/pyproject.toml
index 8a36dc8..f7518ae 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "slotscheck"
-version = "0.16.5"
+version = "0.17.0"
 description = "Ensure your __slots__ are working properly."
 authors = ["Arie Bovenberg <a.c.bovenberg@gmail.com>"]
 license = "MIT"
@@ -8,7 +8,6 @@ classifiers = [
     "Typing :: Typed",
     "Topic :: Software Development :: Quality Assurance",
     "Programming Language :: Python :: Implementation :: CPython",
-    "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
@@ -23,14 +22,12 @@ repository = "https://github.com/ariebovenberg/slotscheck"
 homepage = "https://github.com/ariebovenberg/slotscheck"
 
 [tool.poetry.dependencies]
-python = ">=3.7,<4"
-importlib-metadata = {version = ">=1,<6", python = "<3.8"}
-typing-extensions = {version = ">=4.1,<5", python = "<3.10"}
+python = ">=3.8.1,<4"
 click = "^8.0"
 tomli = {version = ">=0.2.6,<3.0.0", python = "<3.11"}
 
 [tool.poetry.dev-dependencies]
-flake8 = "^5.0.4"
+flake8 = "^6.1"
 isort = "^5.11.5"
 mypy = "^1.4"
 pytest = "^7.4.0"
diff --git a/src/slotscheck/__init__.py b/src/slotscheck/__init__.py
index 13a7bc2..802d61d 100644
--- a/src/slotscheck/__init__.py
+++ b/src/slotscheck/__init__.py
@@ -1,6 +1,3 @@
 # Single-sourcing the version number with poetry:
 # https://github.com/python-poetry/poetry/pull/2366#issuecomment-652418094
-try:
-    __version__ = __import__("importlib.metadata").metadata.version(__name__)
-except ModuleNotFoundError:  # pragma: no cover
-    __version__ = __import__("importlib_metadata").version(__name__)
+__version__ = __import__("importlib.metadata").metadata.version(__name__)
diff --git a/src/slotscheck/checks.py b/src/slotscheck/checks.py
index 32c3ca8..aaa0bda 100644
--- a/src/slotscheck/checks.py
+++ b/src/slotscheck/checks.py
@@ -1,23 +1,9 @@
 "Slots-related checks and inspection tools"
 import platform
 import sys
-from typing import Callable, Collection, Iterator, Optional
+from typing import Collection, Iterator, Optional
 
-from .common import either
-
-is_typeddict: Callable[[type], bool]
-
-try:
-    from typing import is_typeddict
-
-    try:
-        from typing_extensions import is_typeddict as _is_typing_ext_typeddict
-    except ImportError:  # pragma: no cover
-        pass
-    else:
-        is_typeddict = either(is_typeddict, _is_typing_ext_typeddict)
-except ImportError:  # pragma: no cover
-    from typing_extensions import is_typeddict
+from .common import is_typeddict
 
 
 def slots(c: type) -> Optional[Collection[str]]:
diff --git a/src/slotscheck/cli.py b/src/slotscheck/cli.py
index de641d2..8b65b26 100644
--- a/src/slotscheck/cli.py
+++ b/src/slotscheck/cli.py
@@ -36,6 +36,7 @@
     compose,
     flatten,
     groupby,
+    is_protocol,
     map_optional,
 )
 from .discovery import (
@@ -51,11 +52,6 @@
     walk_classes,
 )
 
-try:
-    from typing import Protocol
-except ImportError:  # pragma: no cover
-    from typing_extensions import Protocol  # type: ignore[assignment]
-
 
 @click.command("slotscheck")
 @click.argument(
@@ -569,7 +565,7 @@ def slot_messages(
         require_subclass
         and not has_slots(c)
         and not has_slotless_base(c)
-        and Protocol not in c.__bases__
+        and not is_protocol(c)
     ):
         yield ShouldHaveSlots(c)
 
diff --git a/src/slotscheck/common.py b/src/slotscheck/common.py
index 62f6e6d..932e331 100644
--- a/src/slotscheck/common.py
+++ b/src/slotscheck/common.py
@@ -9,6 +9,7 @@
     Iterator,
     Mapping,
     Optional,
+    Protocol,
     Set,
     Tuple,
     TypeVar,
@@ -71,18 +72,18 @@ def both(__a: Predicate[_T1], __b: Predicate[_T1]) -> Predicate[_T1]:
 
 
 @overload
-def either(
+def _either(
     __a: Callable[[_T1], bool], __b: Callable[[_T1], bool]
 ) -> Callable[[_T1], bool]:
     ...
 
 
 @overload
-def either(__a: Predicate[_T1], __b: Predicate[_T1]) -> Predicate[_T1]:
+def _either(__a: Predicate[_T1], __b: Predicate[_T1]) -> Predicate[_T1]:
     ...
 
 
-def either(__a: Any, __b: Any) -> Any:
+def _either(__a: Any, __b: Any) -> Any:
     return lambda x: __a(x) or __b(x)
 
 
@@ -96,6 +97,37 @@ def _is_none(x: object) -> bool:
     return x is None
 
 
+is_typeddict: Callable[[type], bool]
+
+from typing import is_typeddict  # noqa: E402
+
+try:
+    from typing_extensions import is_typeddict as _is_typing_ext_typeddict
+except ImportError:  # pragma: no cover
+    pass
+else:
+    is_typeddict = _either(is_typeddict, _is_typing_ext_typeddict)
+
+
+# Note that typing.is_protocol is not available yet (CPython PR 104878)
+# The implementation below is derived from it.
+def is_protocol(t: type) -> bool:
+    return getattr(t, "_is_protocol", False) and t != Protocol
+
+
+try:
+    from typing_extensions import Protocol as _TypingExtProtocol
+except ImportError:  # pragma: no cover
+    pass
+else:
+
+    def is_protocol(t: type) -> bool:  # noqa: F811
+        return getattr(t, "_is_protocol", False) and t not in (
+            Protocol,
+            _TypingExtProtocol,
+        )
+
+
 # From https://github.com/ericvsmith/dataclasses/blob/master/dataclass_tools.py
 # License: https://github.com/ericvsmith/dataclasses/blob/master/LICENSE.txt
 # Changed only `dataclass.fields` naming
diff --git a/tests/examples/module_not_ok/foo.py b/tests/examples/module_not_ok/foo.py
index 0f93089..dd594e2 100644
--- a/tests/examples/module_not_ok/foo.py
+++ b/tests/examples/module_not_ok/foo.py
@@ -1,8 +1,5 @@
 
-try:
-    from typing import Protocol
-except ImportError:
-    from typing_extensions import Protocol
+from typing import Protocol
 
 
 class A:
@@ -107,6 +104,7 @@ class Za(Z):
     __slots__ = ("b", "c")
 
 
+# TODO: also typing extensions version
 class MyProto(Protocol):
     pass
 
diff --git a/tox.ini b/tox.ini
index 7be4505..e30d7ad 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 isolated_build = true
-envlist = py{37,38,39,310,311},lint,mypy,isort,slots
+envlist = py{38,39,310,311},lint,mypy,isort,slots
 
 [testenv]
 allowlist_externals = 
@@ -55,7 +55,6 @@ exclude_lines=
 
 [gh-actions]
 python =
-    3.7: py37
     3.8: py38
     3.9: py39
     3.10: py310, mypy, lint, isort, docs, slots