diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 8d8e905..227a823 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu, macos, windows]
-        golang: ['1.13', '1.16', '1.17']
+        golang: ['1.23', '1.24']
         # currently, we cannot run non-x86_64 machines on Github Actions cloud env.
     runs-on: ${{ matrix.os }}-latest
     name: CI golang ${{ matrix.golang }} on ${{ matrix.os }}
@@ -23,12 +23,6 @@ jobs:
       - uses: actions/setup-go@v2
         with:
           go-version: ${{ matrix.golang }}
-      - name: Change GO11MODULES
-        run: go env -w GO111MODULE=auto
-      - name: Install requirements
-        run: |
-          go get github.com/bmizerany/assert
-          go get github.com/philhofer/fwd
-          go get github.com/tinylib/msgp
       - name: Test
         run: go test -v ./fluent
+        shell: bash
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..cbe1ec2
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,15 @@
+module github.com/fluent/fluent-logger-golang
+
+go 1.23.5
+
+require (
+	github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869
+	github.com/tinylib/msgp v1.3.0
+)
+
+require (
+	github.com/kr/pretty v0.3.1 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/philhofer/fwd v1.1.3-0.20240916144458-20a13a1f6b7c // indirect
+	github.com/rogpeppe/go-internal v1.9.0 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..3f46a69
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,14 @@
+github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869 h1:DDGfHa7BWjL4YnC6+E63dPcxHo2sUxDIu8g3QgEJdRY=
+github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869/go.mod h1:Ekp36dRnpXw/yCqJaO+ZrUyxD+3VXMFFr56k5XYrpB4=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
+github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/philhofer/fwd v1.1.3-0.20240916144458-20a13a1f6b7c h1:dAMKvw0MlJT1GshSTtih8C2gDs04w8dReiOGXrGLNoY=
+github.com/philhofer/fwd v1.1.3-0.20240916144458-20a13a1f6b7c/go.mod h1:RqIHx9QI14HlwKwm98g9Re5prTQ6LdeRQn+gXJFxsJM=
+github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsKMEsNbx1VGcRFpLqf3715MtcvvzbA=
+github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8=
+github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
+github.com/tinylib/msgp v1.3.0 h1:ULuf7GPooDaIlbyvgAxBV/FI7ynli6LZ1/nVUNu+0ww=
+github.com/tinylib/msgp v1.3.0/go.mod h1:ykjzy2wzgrlvpDCRc4LA8UXy6D8bzMSuAF3WD57Gok0=