diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 64e56dd..09cccfd 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -30,7 +30,7 @@ jobs:
         sudo rm -rf "$AGENT_TOOLSDIRECTORY"
 
     - uses: actions/checkout@v4
-    - uses: docker-practice/actions-setup-docker@master
+
     - name: Test docker
       run: |
           set -x
diff --git a/versionix/parser.py b/versionix/parser.py
index 78f33a1..5489149 100644
--- a/versionix/parser.py
+++ b/versionix/parser.py
@@ -111,7 +111,7 @@ def _get_container_runner(container):
             sys.exit(1)
     else:
         # Assume a Docker image (name[:tag] or registry/name[:tag])
-        image = container.removeprefix("docker://")
+        image = container[len("docker://"):] if container.startswith("docker://") else container
         quoted_image = shlex.quote(image)
         if shutil.which("docker"):
             return f"docker run --rm {quoted_image}"