diff --git a/.drone.yml b/.drone.yml
index 4931029..5ee1fe4 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -7,9 +7,9 @@ steps:
   - name: publish
     image: maven:3.8.4-openjdk-11
     commands:
-      - echo "$GPG_PRIVATE_KEY" >> "gpg.key"
-      - echo "$MAVEN_SETTINGS" >> "maven-settings.xml"
-      - gpg --pinentry-mode loopback --passphrase $GPG_PASSPHRASE --import gpg.key
+      - echo "${GPG_PRIVATE_KEY}" >> "gpg.key"
+      - echo "${MAVEN_SETTINGS}" >> "maven-settings.xml"
+      - gpg --pinentry-mode loopback --passphrase ${GPG_PASSPHRASE} --import gpg.key
       - mvn --settings maven-settings.xml -U -P ossrh,release clean deploy
 
 trigger: