diff --git a/CHANGELOG.md b/CHANGELOG.md
index f737401..8c92c57 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 - Add PSS flag for PSP->PSS migration.
+- Fix default `namespaceSelector` for tap MutatingWebhookConfiguration.
 
 ## [1.3.0] - 2023-08-29
 
diff --git a/helm/linkerd-viz/values.schema.json b/helm/linkerd-viz/values.schema.json
index 0aa4bcb..08481b5 100644
--- a/helm/linkerd-viz/values.schema.json
+++ b/helm/linkerd-viz/values.schema.json
@@ -579,7 +579,12 @@
                     "type": "string"
                 },
                 "namespaceSelector": {
-                    "type": ["null", "array"]
+                    "type": ["null","object"],
+                    "properties": {
+                        "matchExpressions": {
+                            "type": ["null", "array"]
+                        }
+                    }
                 },
                 "objectSelector": {
                     "type": ["null", "array"]
diff --git a/helm/linkerd-viz/values.yaml b/helm/linkerd-viz/values.yaml
index 45efaed..a255f86 100644
--- a/helm/linkerd-viz/values.yaml
+++ b/helm/linkerd-viz/values.yaml
@@ -255,6 +255,7 @@ tapInjector:
     pullPolicy: ""
 
   namespaceSelector:
+    matchExpressions:
     - key: kubernetes.io/metadata.name
       operator: NotIn
       values: