diff --git a/.gitea/workflows/docker.yml b/.gitea/workflows/docker.yml
index f39931f..d658ded 100644
--- a/.gitea/workflows/docker.yml
+++ b/.gitea/workflows/docker.yml
@@ -150,6 +150,10 @@ jobs:
             FINAL_NAME="$IMAGE_NAME_CFG"
           fi
 
+          # Docker requires all image references to be lowercase
+          FINAL_OWNER="$(echo "$FINAL_OWNER" | tr '[:upper:]' '[:lower:]')"
+          FINAL_NAME="$(echo "$FINAL_NAME" | tr '[:upper:]' '[:lower:]')"
+
           # Construct the full image reference (without tag)
           IMAGE_REF="${REGISTRY_HOST}/${FINAL_OWNER}/${FINAL_NAME}"
           echo "Image reference: ${IMAGE_REF}:<tag>"