diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9a46cca..a5fb166 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ jobs:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
       - uses: actions/setup-go@924ae3a1cded613372ab5595356fb5720e22ba16 # v6.5.0
         with:
-          go-version: "1.26.4" # update together with dev.dockerfile
+          go-version: "1.26.5" # 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@35b54afac29c97fb54faba5b513f8fbd1882f113 # v3.24
@@ -43,7 +43,7 @@ jobs:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
       - uses: actions/setup-go@924ae3a1cded613372ab5595356fb5720e22ba16 # v6.5.0
         with:
-          go-version: "1.26.4" # update together with dev.dockerfile
+          go-version: "1.26.5" # update together with dev.dockerfile
       - run: make test-latest-deps
 
   test22:
@@ -62,7 +62,7 @@ jobs:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
       - uses: actions/setup-go@924ae3a1cded613372ab5595356fb5720e22ba16 # v6.5.0
         with:
-          go-version: "1.26.4" # update together with dev.dockerfile
+          go-version: "1.26.5" # update together with dev.dockerfile
       - uses: golangci/golangci-lint-action@ba0d7d2ec06a0ea1cb5fa41b2e4a3ab91d21278a # v9.3.0
         with:
           version: "v2.12.2" # update together with dev.dockerfile
@@ -73,7 +73,7 @@ jobs:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
       - uses: actions/setup-go@924ae3a1cded613372ab5595356fb5720e22ba16 # v6.5.0
         with:
-          go-version: "1.26.4" # update together with dev.dockerfile
+          go-version: "1.26.5" # update together with dev.dockerfile
       - run: make apply-latest-deps
       - uses: golangci/golangci-lint-action@ba0d7d2ec06a0ea1cb5fa41b2e4a3ab91d21278a # v9.3.0
         with:
@@ -86,5 +86,5 @@ jobs:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
       - uses: actions/setup-go@924ae3a1cded613372ab5595356fb5720e22ba16 # v6.5.0
         with:
-          go-version: "1.26.4" # update together with dev.dockerfile
+          go-version: "1.26.5" # update together with dev.dockerfile
       - run: make check-tidy
diff --git a/dev.dockerfile b/dev.dockerfile
index f8032ca..e6db3b4 100644
--- a/dev.dockerfile
+++ b/dev.dockerfile
@@ -1,5 +1,5 @@
 # update together with .github/workflows/ci.yml
-FROM golang:1.26.4 AS go
+FROM golang:1.26.5 AS go
 
 # update together with .github/workflows/ci.yml
 FROM golangci/golangci-lint:v2.12.2 AS linter