diff --git a/Jenkinsfile.pjt b/Jenkinsfile.pjt
index 6fbb727..e27640d 100644
--- a/Jenkinsfile.pjt
+++ b/Jenkinsfile.pjt
@@ -240,7 +240,7 @@ pipeline {
             TAGS_TO_DELETE=$(curl -s -u "$DOCKER_USER:$DOCKER_PASS" https://${REGISTRY_HOST}/v2/${IMAGE_REPO}/tags/list | jq -r '.tags[]' | grep -E '^[0-9]+' | sort -t- -k1,1n | head -n -5)
 
             for TAG in $TAGS_TO_DELETE; do
-              DIGEST=$(curl -sI -u "$DOCKER_USER:$DOCKER_PASS" -H "Accept: application/vnd.docker.distribution.manifest.v2+json" https://${REGISTRY_HOST}/v2/${IMAGE_REPO}/manifests/$TAG | grep Docker-Content-Digest | awk '{print $2}' | tr -d $'\r')
+              DIGEST=$(curl -s -u "$DOCKER_USER:$DOCKER_PASS" -H "Accept: application/vnd.docker.distribution.manifest.v2+json" -D - https://${REGISTRY_HOST}/v2/${IMAGE_REPO}/manifests/$TAG -o /dev/null | grep -i Docker-Content-Digest | awk '{print $2}' | tr -d $'\r')
 
               echo "[DRY] $TAG -> $DIGEST"
             done