diff --git a/charts/plausible/ci/ct-values.yaml b/charts/plausible/ci/ct-values.yaml
index f2e5e7f0..c2f1d6ab 100644
--- a/charts/plausible/ci/ct-values.yaml
+++ b/charts/plausible/ci/ct-values.yaml
@@ -1,3 +1,5 @@
 env:
   - name: BASE_URL
     value: http://localhost:8000
+  - name: SECRET_KEY_BASE
+    value: foo-bar-secret-123