diff --git a/zammad/Chart.yaml b/zammad/Chart.yaml
index d09e43ff..6afc0785 100644
--- a/zammad/Chart.yaml
+++ b/zammad/Chart.yaml
@@ -1,7 +1,7 @@
 apiVersion: v2
 name: zammad
-version: 12.3.6
-appVersion: 6.3.1-144
+version: 12.4.0
+appVersion: 6.3.1-156
 description: Zammad is a web based open source helpdesk/customer support system with many features to manage customer communication via several channels like telephone, facebook, twitter, chat and e-mails.
 home: https://zammad.org
 icon: https://raw.githubusercontent.com/zammad/zammad-documentation/main/images/zammad_logo_600x520.png
diff --git a/zammad/ci/full-values.yaml b/zammad/ci/full-values.yaml
index 81d50ddd..c5184e2f 100644
--- a/zammad/ci/full-values.yaml
+++ b/zammad/ci/full-values.yaml
@@ -50,6 +50,7 @@ zammadConfig:
       mountPath: /opt/zammad/custom_mount
       readOnly: true
   nginx:
+    clientMaxBodySize: 111M
     podLabels:
       my-nginx-pod-label: my-nginx-pod-label-value
     podAnnotations:
diff --git a/zammad/templates/configmap-nginx.yaml b/zammad/templates/configmap-nginx.yaml
index 292e5bbe..bd5d52c0 100644
--- a/zammad/templates/configmap-nginx.yaml
+++ b/zammad/templates/configmap-nginx.yaml
@@ -38,7 +38,7 @@ data:
         access_log /dev/stdout;
         error_log  /dev/stderr;
 
-        client_max_body_size 50M;
+        client_max_body_size {{ .Values.zammadConfig.nginx.clientMaxBodySize }};
 
         {{- /* Trusted proxies */}}
         {{ if .Values.zammadConfig.nginx.trustedProxies }}
diff --git a/zammad/values.yaml b/zammad/values.yaml
index 4a911bdf..a9d32e66 100644
--- a/zammad/values.yaml
+++ b/zammad/values.yaml
@@ -98,6 +98,8 @@ zammadConfig:
       # - 'HeaderName "Header Value"'
     websocketExtraHeaders: []
       # - 'HeaderName "Header Value"'
+    # Maximum upload size
+    clientMaxBodySize: 50M
     knowledgeBaseUrl: ""
     livenessProbe:
       tcpSocket: