diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 000000000..bccfeeab0
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,5 @@
+# Tell Git to use LF for line endings on all platforms.
+# Required to have correct test data on Windows.
+# https://github.com/mvdan/github-actions-golang#caveats
+# https://github.com/actions/checkout/issues/135#issuecomment-613361104
+* text eol=lf
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
deleted file mode 100644
index 225dcc404..000000000
--- a/.github/workflows/ci.yml
+++ /dev/null
@@ -1,103 +0,0 @@
-name: go-workflow
-on:
-  push:
-    branches:
-      - master
-      - release/**
-  pull_request:
-jobs:
-  golang-tests:
-    name: tests
-    runs-on: ubuntu-latest
-    timeout-minutes: 10
-    strategy:
-      matrix:
-        go-version: ["tip", "1.15", "1.14", "1.13"]
-        go111module: ["on", "off"]
-        include:
-          # includes goflags when go111module is on
-          - go111module: "on"
-            goflags: -mod=readonly
-    env:
-      GO111MODULE: ${{ matrix.go111module }}
-      # XXX: Investigate why GOPATH is needed for Modules off
-      GOPATH: ${{ github.workspace }}
-    # Required for building with GOPATH
-    # https://github.com/mvdan/github-actions-golang#how-do-i-set-up-a-gopath-build
-    defaults:
-      run:
-        working-directory: ${{ github.workspace }}/src/github.com/getsentry/sentry-go
-    steps:
-      - uses: actions/setup-go@v2
-        if: matrix.go-version != 'tip'
-        with:
-          go-version: ${{ matrix.go-version}}
-      - name: Run setup-go for tip
-        if: matrix.go-version == 'tip'
-        working-directory: ${{ github.workspace }}
-        run: |
-          git clone https://go.googlesource.com/go $HOME/gotip
-          cd $HOME/gotip/src
-          ./make.bash
-          echo "GOROOT=$HOME/gotip" >> $GITHUB_ENV
-          echo "PATH=$HOME/gotip/bin:$PATH" >> $GITHUB_ENV
-      - uses: actions/checkout@v2
-        with:
-          # Relative path under Github workspace
-          path: ${{ github.workspace }}/src/github.com/getsentry/sentry-go
-          # Getting all history enables using `git merge-base origin/master HEAD`
-          fetch-depth: 0
-      - name: Adjustments for Module mode enabled
-        if: matrix.go111module == 'on'
-        run: |
-          echo "GOFLAGS=${{ matrix.goflags }}" >> $GITHUB_ENV
-      - name: Adjustments for Module mode disabled
-        if: matrix.go111module == 'off'
-        run: |
-          # Iris does not supported in legacy GOPATH mode. We delete the source code
-          # because otherwise lint, build, and test steps would fail.
-          rm -vrf ./iris/ ./example/iris/
-          # go get is not required in Module mode
-          go get -v -t ./...
-      - name: Build
-        run: go build ./...
-      - name: Tests
-        run: |
-          go test ./...
-          go test ./... -race
-      - name: Run linting if Go Module is on
-        if: matrix.go111module == 'on'
-        run: |
-          curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/v1.27.0/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.27.0
-          git fetch origin master:remotes/origin/master
-          $(go env GOPATH)/bin/golangci-lint run --new-from-rev=$(git merge-base origin/master HEAD)
-
-  golang-outside-gopath:
-    name: Module support outside GOPATH
-    runs-on: ubuntu-latest
-    timeout-minutes: 5
-    env:
-      GO111MODULE: on
-      GOFLAGS: -mod=readonly
-      GOPATH: ${{ github.workspace }}
-    # Required for building with GOPATH
-    # https://github.com/mvdan/github-actions-golang#how-do-i-set-up-a-gopath-build
-    defaults:
-      run:
-        working-directory: ${{ env.GOPATH }}/src/github.com/getsentry/sentry-go
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          # Relative path under Github workspace
-          path: src/github.com/getsentry/sentry-go
-      - uses: actions/setup-go@v2
-        with:
-          go-version: 1.15
-      - name: Run tests outside of GOPATH
-        run: |
-          mv $GOPATH/src/github.com/getsentry/sentry-go ~/sentry-go
-          cd ~/sentry-go
-          export GOPATH=
-          go env GOPATH
-          go test ./...
-          go test ./... -race
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
new file mode 100644
index 000000000..e15e27e35
--- /dev/null
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,27 @@
+name: Lint
+on:
+  push:
+    branches:
+      - master
+      - release/**
+  pull_request:
+permissions:
+  contents: read
+defaults:
+  run:
+    shell: bash
+concurrency:
+  group: lint-${{ github.ref }}
+  cancel-in-progress: true
+jobs:
+  golangci-lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v2
+        with:
+          version: v1.40.1
+          only-new-issues: true
+    timeout-minutes: 10
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 000000000..40e588197
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,107 @@
+name: Test
+on:
+  push:
+    branches:
+      - master
+      - release/**
+  pull_request:
+permissions:
+  contents: read
+defaults:
+  run:
+    shell: bash
+concurrency:
+  group: test-${{ github.ref }}
+  cancel-in-progress: true
+jobs:
+  test:
+    name: Module Mode
+    runs-on: ${{ matrix.os }}-latest
+    env:
+      GO111MODULE: "on"
+      GOFLAGS: "-mod=readonly"
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/cache@v2
+        with:
+          # In order:
+          # * Module download cache
+          # * Build cache (Linux)
+          # * Build cache (Mac)
+          # * Build cache (Windows)
+          path: |
+            ~/go/pkg/mod
+            ~/.cache/go-build
+            ~/Library/Caches/go-build
+            %LocalAppData%\go-build
+          key: ${{ runner.os }}-go-${{ matrix.go }}-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-${{ matrix.go }}-
+            ${{ runner.os }}-go-
+      - uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go }}
+      - name: Build
+        run: go build ./...
+      - name: Vet
+        run: go vet ./...
+      - name: Test
+        run: go test ./...
+      - name: Test (race)
+        run: go test -race ./...
+    timeout-minutes: 10
+    strategy:
+      matrix:
+        go: ["1.16", "1.15", "1.14"]
+        os: [ubuntu, windows, macos]
+      fail-fast: false
+  test-gopath:
+    name: GOPATH Mode
+    runs-on: ubuntu-latest
+    env:
+      # We use two paths in GOPATH.
+      # The first one is where 'go get' will download dependencies, and
+      # the second is where sentry-go itself will be checked out.
+      GOPATH: ${{ github.workspace }}/deps:${{ github.workspace }}/main
+      GO111MODULE: "off"
+      WORKDIR: ${{ github.workspace }}/main/src/github.com/getsentry/sentry-go
+    defaults:
+      run:
+        working-directory: ${{ env.WORKDIR }}
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          path: ${{ env.WORKDIR }}
+      # TODO: cache dependencies
+      # - uses: actions/cache@v2
+      #   with:
+      #     # In order:
+      #     # * GOPATH with dependencies (but without sentry-go)
+      #     # * GOPATH with sentry-go installed package objects (*.a files)
+      #     # * Build cache (Linux)
+      #     path: |
+      #       ${{ github.workspace }}/deps
+      #       ${{ github.workspace }}/main/pkg
+      #       ~/.cache/go-build
+      #     key: gopath-${{ github.ref }}
+      #     restore-keys: |
+      #       gopath-
+      - uses: actions/setup-go@v2
+        with:
+          go-version: "1"
+      - name: Remove Unsupported Code
+        run: |
+          # Iris requires Module mode, therefore we delete the relevant code to
+          # skip testing it in GOPATH mode.
+          rm -vrf ./iris/ ./example/iris/
+      - name: Download Dependencies
+        run: go get -d -t -v ./...
+      - name: Build
+        run: go build ./...
+      - name: Vet
+        run: go vet ./...
+      - name: Test
+        run: go test ./...
+      - name: Test (race)
+        run: go test -race ./...
+    timeout-minutes: 10