diff --git a/.github/workflows/dockerimage.yml b/.github/workflows/dockerimage.yml
index 9832ad9b..da5de514 100644
--- a/.github/workflows/dockerimage.yml
+++ b/.github/workflows/dockerimage.yml
@@ -36,9 +36,15 @@ jobs:
     - name: Run nginx -V
       run: docker run -t ${{ github.repository }} nginx -V
 
+    # Don’t run, just test the configuration file.
+    # NGINX checks configuration for correct syntax and then try to open files referred in configuration.
+    # https://www.nginx.com/resources/wiki/start/topics/tutorials/commandline/
+    - name: Run nginx -t
+      run: docker run -t ${{ github.repository }} nginx -t
+
     - name: Serve a static asset
       run: |
-        docker run --detach --rm \
+        docker run --rm \
           -p 0.0.0.0:8888:80 \
           -v "$PWD/tests":/static:ro \
           -v "$PWD/tests/static.conf":/etc/nginx/conf.d/static.conf:ro \
diff --git a/Dockerfile b/Dockerfile
index 4641f304..cf71b3f4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,8 +7,8 @@ ARG NGX_BROTLI_COMMIT=9aec15e2aa6feea2113119ba06460af70ab3ea62
 # https://hub.docker.com/r/firesh/nginx-lua/dockerfile
 ARG NGX_DEVEL_KIT_VERSION=0.3.1
 
-# https://github.com/openresty/luajit2/releases
-ARG LUA_NGINX_MODULE_VERSION=0.10.14
+# https://github.com/openresty/lua-nginx-module/releases/
+ARG LUA_NGINX_MODULE_VERSION=0.10.15
 
 ARG CONFIG="\
 		--prefix=/etc/nginx \