diff --git a/pkg/release/helm/testdata/cert-manager/values.yaml b/pkg/release/helm/testdata/cert-manager/values.yaml
index 49c87460..6cf3971a 100644
--- a/pkg/release/helm/testdata/cert-manager/values.yaml
+++ b/pkg/release/helm/testdata/cert-manager/values.yaml
@@ -8,7 +8,7 @@ image:
   repository: nginx
   pullPolicy: IfNotPresent
   # Overrides the image tag whose default is the chart appVersion.
-  tag: ""
+  tag: "@sha256:5aca99593157f4ae539a5dec1092a0ad8762f8e2eb1789085a13a0f5622369f6"
 
 imagePullSecrets: []
 nameOverride: ""