diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c74d14b..ad158b6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ permissions:
 
 jobs:
   test:
-    name: nginx 1.31.4
+    name: nginx 1.31.6
     runs-on: ubuntu-22.04
     timeout-minutes: 45
 
@@ -42,7 +42,7 @@ jobs:
       - name: Build and test
         env:
           CC: gcc
-          NGINX_VERSION: 1.31.4
+          NGINX_VERSION: 1.31.6
         run: |
           set -e
           mkdir -p download-cache
diff --git a/.github/workflows/coverity.yml b/.github/workflows/coverity.yml
index 469af3b..54ed80f 100644
--- a/.github/workflows/coverity.yml
+++ b/.github/workflows/coverity.yml
@@ -19,7 +19,7 @@ jobs:
       LUA_CMODULE_DIR: '/lib'
       JOBS: 3
       NGX_BUILD_JOBS: 3
-      NGINX_VERSION: 1.31.4
+      NGINX_VERSION: 1.31.6
       CC: gcc
     steps:
     - uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6.1.0