diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index d693f43..47b4501 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -16,8 +16,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v4
         with:
-          # go-version-file: ./go.mod
-          go-version: "^1.21.3"
+          go-version-file: ./go.mod
 
       - run: go version
 
@@ -25,7 +24,7 @@ jobs:
 
       - uses: dominikh/staticcheck-action@v1.3.0
         with:
-          version: "2023.1.2"
+          version: "2023.1.6"
           install-go: false
 
       - name: Test
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 8518808..deb71aa 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -14,8 +14,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v4
         with:
-          # go-version-file: ./go.mod
-          go-version: "^1.21.3"
+          go-version-file: ./go.mod
 
       - run: go install github.com/tcnksm/ghr@latest
 
diff --git a/CHANGES.md b/CHANGES.md
index 2f4a00f..b761603 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -11,6 +11,9 @@
 
 ## develop
 
+- [UPDATE] go.mod の Go のバージョンを 1.21.4 にあげる
+  - @voluntas
+
 ## 2023.5.1
 
 - [FIX] HTTP/2 Rapid Reset 対策として Go 1.21.3 以上でリリースバイナリを作成するよう修正する
diff --git a/go.mod b/go.mod
index 283681e..76271e7 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/shiguredo/suzu
 
-go 1.21
+go 1.21.4
 
 require (
 	cloud.google.com/go/speech v1.20.1