diff --git a/CHANGELOG.md b/CHANGELOG.md
index b4cf0f62..004e0a82 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Fix dashboard link for `MimirContinuousTestFailing` alert
+- Fix tests so they fail if some helm template fails to render
 
 ## [4.26.1] - 2024-11-19
 
diff --git a/test/hack/bin/template-chart.sh b/test/hack/bin/template-chart.sh
index 5f9278a9..1efc6fd9 100755
--- a/test/hack/bin/template-chart.sh
+++ b/test/hack/bin/template-chart.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 main() {
   local GIT_WORKDIR