diff --git a/Dockerfile b/Dockerfile
index 9f13672..07c0193 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,3 +1,3 @@
-FROM gcr.io/kaniko-project/executor:v1.23.0-debug
+FROM gcr.io/kaniko-project/executor:v1.23.2-debug
 COPY build.sh /usr/local/bin/
 ENTRYPOINT ["build.sh"]
diff --git a/build.sh b/build.sh
index ebdf890..e1943bb 100755
--- a/build.sh
+++ b/build.sh
@@ -13,10 +13,7 @@ cat <<EOF > /kaniko/.docker/config.json
 }
 EOF
 
-if [ -z "$IMAGEAPP" ]; then
-    REGISTRY="$(echo "$GITHUB_SERVER_URL" | sed 's .*://  ')"
-    IMAGEAPP="$REGISTRY/$INPUT_IMAGE"
-fi
+[ -z "$IMAGEAPP" ] && IMAGEAPP="$${REGISTRY#*://}/$INPUT_IMAGE"
 
 /kaniko/executor \
     --cache="${INPUT_CACHE}" \