diff --git a/helmchart/single-sign-on/CHANGELOG.md b/helmchart/single-sign-on/CHANGELOG.md
new file mode 100644
index 0000000000000000000000000000000000000000..77f813c56cce95186afc56cd433f13bf15153667
--- /dev/null
+++ b/helmchart/single-sign-on/CHANGELOG.md
@@ -0,0 +1,11 @@
+# Changelog
+
+All notable changes to this helm chart will be documented in this file.
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.4.0] - 2021-11-12
+
+- Upgrade Hydra subchart to 0.19.5
+- Rename `master` branch to `main` and replace references to `master`
+- Replace references to `oas` or `openappstack` to `stackspin`
diff --git a/helmchart/single-sign-on/Chart.yaml b/helmchart/single-sign-on/Chart.yaml
index 1604d49502b2631209435fa52cc91c811dfeb5c7..a8a4cbfdd671a47a2297de5d7c5eb69bc2c525ab 100644
--- a/helmchart/single-sign-on/Chart.yaml
+++ b/helmchart/single-sign-on/Chart.yaml
@@ -1,4 +1,4 @@
 apiVersion: v1
 description: A Helm chart for Stackspin's Single sign-on components
 name: single-sign-on
-version: 0.3.0
+version: 0.4.0
diff --git a/helmchart/single-sign-on/values.yaml b/helmchart/single-sign-on/values.yaml
index 2c35294e3f3a6fb3dd9f26a5c487583754f626c6..a7ab017b0ac5bafb486bc17edfd8b927034f63b8 100644
--- a/helmchart/single-sign-on/values.yaml
+++ b/helmchart/single-sign-on/values.yaml
@@ -202,7 +202,8 @@ hydra:
       secrets:
         # hydra.hydra.config.secret is used as a seed whenever cryptographic operations are
         # performed by hydra i.e. creation of a token.
-        system: "YouReallyNeedToChangeThis"
+        system:
+          - "YouReallyNeedToChangeThis"
   ingress:
     public:
       enabled: true