diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 593c8a5..3a6e5cf 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,7 +30,7 @@ jobs:
       - uses: actions/checkout@v4.2.2
       - uses: actions/setup-go@v5.3.0
         with:
-          go-version: "1.23.5" # update together with dev.dockerfile
+          go-version: "1.23.6" # update together with dev.dockerfile
       - name: Debug with tmate SSH if enabled
         if: ${{ github.event_name == 'workflow_dispatch' && inputs.debug_ssh }}
         uses: mxschmitt/action-tmate@v3.19
@@ -45,7 +45,7 @@ jobs:
       - uses: actions/checkout@v4.2.2
       - uses: actions/setup-go@v5.3.0
         with:
-          go-version: "1.23.5" # update together with dev.dockerfile
+          go-version: "1.23.6" # update together with dev.dockerfile
       - run: make test-latest-deps
 
   test22:
@@ -64,7 +64,7 @@ jobs:
       - uses: actions/checkout@v4.2.2
       - uses: actions/setup-go@v5.3.0
         with:
-          go-version: "1.23.5" # update together with dev.dockerfile
+          go-version: "1.23.6" # update together with dev.dockerfile
       - uses: golangci/golangci-lint-action@v6.3.0
         with:
           version: "v1.63.4" # update together with dev.dockerfile
@@ -76,5 +76,5 @@ jobs:
       - uses: actions/checkout@v4.2.2
       - uses: actions/setup-go@v5.3.0
         with:
-          go-version: "1.23.5" # update together with dev.dockerfile
+          go-version: "1.23.6" # update together with dev.dockerfile
       - run: make check-tidy
diff --git a/dev.dockerfile b/dev.dockerfile
index c1668b7..7945956 100644
--- a/dev.dockerfile
+++ b/dev.dockerfile
@@ -1,5 +1,5 @@
 # update together with .github/workflows/ci.yml
-FROM golang:1.23.5 AS go
+FROM golang:1.23.6 AS go
 
 # update together with .github/workflows/ci.yml
 FROM golangci/golangci-lint:v1.63.4 AS linter