diff --git a/.github/workflows/create-psalm-container.yml b/.github/workflows/create-psalm-container.yml
index b5926aa4..d2bfa129 100644
--- a/.github/workflows/create-psalm-container.yml
+++ b/.github/workflows/create-psalm-container.yml
@@ -22,7 +22,11 @@ jobs:
         run: |
           set -x
           sed -i 's|FROM php:7.4-alpine|FROM php:8.0-alpine|' "psalm-github-actions/Dockerfile"
-          set +x
+          cat << APCU >> "psalm-github-actions/Dockerfile"
+          RUN mkdir -p /usr/src/php/ext/apcu && \
+            curl -fsSL https://pecl.php.net/get/apcu | tar xvz -C "/usr/src/php/ext/apcu" --strip 1 && \
+            docker-php-ext-install apcu
+          APCU
 
       - name: Log in to GitHub Docker Registry
         uses: docker/login-action@v1