update mcapi version

Change-Id: I061a0f1336a9fe66c984abe8f61b79a739c51cc0
diff --git a/images/magnum/Dockerfile b/images/magnum/Dockerfile
index c2cb92c..c60d80f 100644
--- a/images/magnum/Dockerfile
+++ b/images/magnum/Dockerfile
@@ -18,7 +18,7 @@
 pip3 install \
     --constraint /upper-constraints.txt \
         /src/magnum \
-        magnum-cluster-api==0.24.2
+        magnum-cluster-api==0.26.0
 EOF
 
 FROM openstack-python-runtime
diff --git a/releasenotes/notes/magnum-update-mcapi-to-0.25.1-fbf7f3dd8b81489c.yaml b/releasenotes/notes/magnum-update-mcapi-to-0.25.1-fbf7f3dd8b81489c.yaml
new file mode 100644
index 0000000..c563d8c
--- /dev/null
+++ b/releasenotes/notes/magnum-update-mcapi-to-0.25.1-fbf7f3dd8b81489c.yaml
@@ -0,0 +1,3 @@
+---
+upgrade:
+  - Upgrade Cluster API driver for Magnum to 0.26.0.