diff --git a/.woodpecker.yml b/.woodpecker.yml
index e795c53..b8ed281 100644
--- a/.woodpecker.yml
+++ b/.woodpecker.yml
@@ -3,7 +3,7 @@ steps:
     image: woodpeckerci/plugin-kaniko:next
     pull: true
     environment:
-      - CTAG=2.0.0
+      - CTAG="2.0.0"
     settings:
       registry: git.sandbox.iuk.hdm-stuttgart.de
       repo: grosse/jupyterhub