diff --git a/.drone.yml b/.drone.yml
index 80d32f2..c1a426c 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -13,18 +13,18 @@ steps:
   - name: docker
     image: plugins/docker
     settings:
-      username: ${DOCKERHUB_USERNAME}
-      password: ${DOCKERHUB_PASSWORD}
+      username: "${DOCKERHUB_USERNAME}"
+      password: "${DOCKERHUB_PASSWORD}"
       repo: glenux/service-ntfy
-      tags: ${DRONE_BRANCH//\//-}-${DRONE_COMMIT_SHA:0:8}
+      tags: "${DRONE_BRANCH//\//-}-${DRONE_COMMIT_SHA:0:8}"
 
   - name: docker
     image: plugins/docker
     settings:
-      username: ${DOCKERHUB_USERNAME}
-      password: ${DOCKERHUB_PASSWORD}
+      username: "${DOCKERHUB_USERNAME}"
+      password: "${DOCKERHUB_PASSWORD}"
       repo: glenux/service-ntfy
-      tags: latest_${DRONE_BRANCH}
+      tags: "latest_${DRONE_BRANCH}"
     when:
       branch:
         - master
@@ -34,8 +34,8 @@ steps:
   - name: docker
     image: plugins/docker
     settings:
-      username: ${DOCKERHUB_USERNAME}
-      password: ${DOCKERHUB_PASSWORD}
+      username: "${DOCKERHUB_USERNAME}"
+      password: "${DOCKERHUB_PASSWORD}"
       repo: glenux/service-ntfy
       tags: latest
     when: