diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index 26fac99..0000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,26 +0,0 @@
-# Use the latest 2.1 version of CircleCI pipeline process engine. See: https://circleci.com/docs/2.0/configuration-reference
-version: 2.1
-jobs:
-  build:
-    working_directory: ~/repo
-    docker:
-      - image: cimg/go:1.20
-    steps:
-      - checkout
-      - restore_cache:
-          keys:
-            - go-mod-v4-{{ checksum "go.sum" }}
-      - run:
-          name: Install Dependencies
-          command: go mod download
-      - save_cache:
-          key: go-mod-v4-{{ checksum "go.sum" }}
-          paths:
-            - "/go/pkg/mod"
-      - run:
-          name: Run tests
-          command: |
-            mkdir -p /tmp/test-reports
-            gotestsum --junitfile /tmp/test-reports/unit-tests.xml
-      - store_test_results:
-          path: /tmp/test-reports
diff --git a/.github/workflows/go-cross.yml b/.github/workflows/go-cross.yml
new file mode 100644
index 0000000..d284bd4
--- /dev/null
+++ b/.github/workflows/go-cross.yml
@@ -0,0 +1,32 @@
+name: Go Matrix
+on: [push, pull_request]
+
+jobs:
+
+  cross:
+    name: Go
+    runs-on: ${{ matrix.os }}
+    env:
+      CGO_ENABLED: 0
+
+    strategy:
+      matrix:
+        go-version: [ oldstable, stable ]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    steps:
+      # https://github.com/marketplace/actions/checkout
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      # https://github.com/marketplace/actions/setup-go-environment
+      - name: Set up Go ${{ matrix.go-version }}
+        uses: actions/setup-go@v5
+        with:
+          go-version: ${{ matrix.go-version }}
+
+      - name: Test
+        run: go test -v -cover ./...
+
+      - name: Build
+        run: go build -v -ldflags "-s -w" -trimpath
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000..c5affe9
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,44 @@
+name: Main
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+
+  main:
+    name: Main Process
+    runs-on: ubuntu-latest
+    env:
+      GO_VERSION: stable
+      GOLANGCI_LINT_VERSION: v1.57.0
+      CGO_ENABLED: 0
+
+    steps:
+      # https://github.com/marketplace/actions/checkout
+      - name: Check out code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      # https://github.com/marketplace/actions/setup-go-environment
+      - name: Set up Go ${{ env.GO_VERSION }}
+        uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+
+      - name: Check and get dependencies
+        run: |
+          go mod download
+          go mod tidy
+          git diff --exit-code go.mod
+          git diff --exit-code go.sum
+
+      # https://golangci-lint.run/usage/install#other-ci
+      - name: Install golangci-lint ${{ env.GOLANGCI_LINT_VERSION }}
+        run: curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin ${GOLANGCI_LINT_VERSION}
+
+      - name: Make
+        run: make
diff --git a/contextcheck.go b/contextcheck.go
index 50e11f3..6269635 100644
--- a/contextcheck.go
+++ b/contextcheck.go
@@ -5,7 +5,6 @@ import (
 	"go/token"
 	"go/types"
 	"regexp"
-	"strconv"
 	"strings"
 	"sync"
 
@@ -222,37 +221,6 @@ func (r *runner) collectHttpTyps(pssa *buildssa.SSA) {
 	}
 }
 
-func (r *runner) noImportedContextAndHttp(f *ssa.Function) (ret bool) {
-	if !f.Pos().IsValid() {
-		return false
-	}
-
-	file := analysisutil.File(r.pass, f.Pos())
-	if file == nil {
-		return false
-	}
-
-	if skip, has := r.skipFile[file]; has {
-		return skip
-	}
-	defer func() {
-		r.skipFile[file] = ret
-	}()
-
-	for _, impt := range file.Imports {
-		path, err := strconv.Unquote(impt.Path.Value)
-		if err != nil {
-			continue
-		}
-		path = analysisutil.RemoveVendor(path)
-		if path == ctxPkg || path == httpPkg {
-			return false
-		}
-	}
-
-	return true
-}
-
 func (r *runner) checkIsEntry(f *ssa.Function) (ret entryType) {
 	// if r.noImportedContextAndHttp(f) {
 	// 	return EntryNormal