diff --git a/.changeset/grumpy-cups-tell.md b/.changeset/grumpy-cups-tell.md
new file mode 100644
index 0000000..f8b9efb
--- /dev/null
+++ b/.changeset/grumpy-cups-tell.md
@@ -0,0 +1,5 @@
+---
+"@openproject/helm-charts": major
+---
+
+Upgrade OpenProject to 15.0
diff --git a/charts/openproject/Chart.yaml b/charts/openproject/Chart.yaml
index f2a34ad..a024852 100644
--- a/charts/openproject/Chart.yaml
+++ b/charts/openproject/Chart.yaml
@@ -5,7 +5,7 @@ description: A Helm chart for running OpenProject via Kubernetes
 home: https://www.openproject.org/
 icon: https://charts.openproject.org/logo.svg
 type: application
-appVersion: 14.6.3
+appVersion: 15.0.1
 version: 8.3.2
 maintainers:
 - name: OpenProject
diff --git a/charts/openproject/values.yaml b/charts/openproject/values.yaml
index 40b15ab..8835b86 100644
--- a/charts/openproject/values.yaml
+++ b/charts/openproject/values.yaml
@@ -201,7 +201,7 @@ image:
   ## For the helm chart, use the `-slim` variants as the all-in-one container is not compatible
   ## with some of the options (non-root execution, password splitting, etc.) and is inefficient for using in helm
   ## due to embedded a number of services.
-  tag: "14.6.3-slim"
+  tag: "15.0.1-slim"
 
   ## Define image sha256 - mutual exclusive with image tag.
   ## The sha256 has a higher precedence than