diff --git a/Jenkinsfile.pjt b/Jenkinsfile.pjt
index 0b95d38..27f5dbb 100644
--- a/Jenkinsfile.pjt
+++ b/Jenkinsfile.pjt
@@ -224,6 +224,16 @@ pipeline {
       }
     }
 
+    stage('jq tools install') {
+      steps {
+        sh '''
+          if ! command -v jq >/dev/null; then
+            sudo apt-get update -y
+            sudo apt-get install -y jq
+          fi
+        '''
+      }
+    }
 
     stage('12) registry docker image cleanup') {
       steps {
@@ -238,7 +248,7 @@ pipeline {
             echo "[1/2] docker registry login"
             echo "$DOCKER_PASS" | docker login ${REGISTRY_HOST} -u "$DOCKER_USER" --password-stdin
 
-            TAGS_TO_DELETE=$(curl -s -u "$DOCKER_USER:$DOCKER_PASS" https://${REGISTRY_HOST}/v2/${IMAGE_REPO}/tags/list | sed -n 's/.*"tags":\[\(.*\)\].*/\1/p' | tr -d '"' | tr ',' '\n' | grep -E '^[0-9]+' | sort -t- -k1,1n | head -n -5)
+            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)
 
             echo "$TAGS_TO_DELETE"