diff --git a/.github/workflows/registry-ci.yml b/.github/workflows/registry-ci.yml
index 67a99a3eb..323ea3b34 100644
--- a/.github/workflows/registry-ci.yml
+++ b/.github/workflows/registry-ci.yml
@@ -19,6 +19,9 @@ jobs:
     env:
       COMANAGE_REGISTRY_DIR: /srv/comanage-registry
 
+      # Pin Docker API for PHP Testcontainers (daemon supports max 1.44)
+      DOCKER_API_VERSION: "1.44"
+
       # Values used by your PHPUnit setup test
       COMANAGE_REGISTRY_ADMIN_GIVEN_NAME: Admin
       COMANAGE_REGISTRY_ADMIN_FAMILY_NAME: User
@@ -109,7 +112,7 @@ jobs:
           composer --version
           docker --version
           docker version
-          echo "$DOCKER_HOST"
+          echo "${DOCKER_HOST-}"
           docker context show
 
       - name: Create local/config/database.php placeholder