diff --git a/class/defaults.yml b/class/defaults.yml
index 8d94a77..a48554b 100644
--- a/class/defaults.yml
+++ b/class/defaults.yml
@@ -194,3 +194,13 @@ parameters:
                   spec:
                     affinity:
                       nodeAffinity: ${openshift4_slos:controller_node_affinity}
+          # Use replace for CRDs to avoid errors because the
+          # last-applied-configuration annotation gets too big.
+          - patch: |-
+              $patch: merge
+              apiVersion: apiextensions.k8s.io/v1
+              kind: CustomResourceDefinition
+              metadata:
+                name: schedulercanaries.monitoring.appuio.io
+                annotations:
+                  argocd.argoproj.io/sync-options: Replace=true
diff --git a/tests/golden/defaults/openshift4-slos/openshift4-slos/scheduler-canary-deployment/apiextensions.k8s.io_v1_customresourcedefinition_schedulercanaries.monitoring.appuio.io.yaml b/tests/golden/defaults/openshift4-slos/openshift4-slos/scheduler-canary-deployment/apiextensions.k8s.io_v1_customresourcedefinition_schedulercanaries.monitoring.appuio.io.yaml
index 9537aae..fa1cffd 100644
--- a/tests/golden/defaults/openshift4-slos/openshift4-slos/scheduler-canary-deployment/apiextensions.k8s.io_v1_customresourcedefinition_schedulercanaries.monitoring.appuio.io.yaml
+++ b/tests/golden/defaults/openshift4-slos/openshift4-slos/scheduler-canary-deployment/apiextensions.k8s.io_v1_customresourcedefinition_schedulercanaries.monitoring.appuio.io.yaml
@@ -2,6 +2,7 @@ apiVersion: apiextensions.k8s.io/v1
 kind: CustomResourceDefinition
 metadata:
   annotations:
+    argocd.argoproj.io/sync-options: Replace=true
     controller-gen.kubebuilder.io/version: v0.15.0
   name: schedulercanaries.monitoring.appuio.io
 spec: