diff --git a/go.mod b/go.mod
index 619920ee..c56f3264 100644
--- a/go.mod
+++ b/go.mod
@@ -19,5 +19,5 @@ require (
 	k8s.io/code-generator v0.20.7
 	k8s.io/kube-openapi v0.0.0-20201113171705-d219536bb9fd
 	knative.dev/hack v0.0.0-20210806075220-815cd312d65c
-	knative.dev/pkg v0.0.0-20210823133635-12d915ede293
+	knative.dev/pkg v0.0.0-20210824120823-a94f5f07b3c3
 )
diff --git a/go.sum b/go.sum
index f8c203a7..94950358 100644
--- a/go.sum
+++ b/go.sum
@@ -969,8 +969,8 @@ k8s.io/utils v0.0.0-20201110183641-67b214c5f920 h1:CbnUZsM497iRC5QMVkHwyl8s2tB3g
 k8s.io/utils v0.0.0-20201110183641-67b214c5f920/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
 knative.dev/hack v0.0.0-20210806075220-815cd312d65c h1:nOXoDWAAItwr4o0dp3nHr6skgpVD4IvME/UX84YNl5k=
 knative.dev/hack v0.0.0-20210806075220-815cd312d65c/go.mod h1:PHt8x8yX5Z9pPquBEfIj0X66f8iWkWfR0S/sarACJrI=
-knative.dev/pkg v0.0.0-20210823133635-12d915ede293 h1:6GvpU4ESZxfb+trIhvMTZcZSfGGeIf+F1aG7Fv3R9gA=
-knative.dev/pkg v0.0.0-20210823133635-12d915ede293/go.mod h1:67yUYAgAWesv4ehCShUuIxkaxrsROSLQr3kApW4xPO4=
+knative.dev/pkg v0.0.0-20210824120823-a94f5f07b3c3 h1:38SNaSkVBI1Fkc4Lk2AMEjPW03h3cAwTS3+dKK9RV+M=
+knative.dev/pkg v0.0.0-20210824120823-a94f5f07b3c3/go.mod h1:67yUYAgAWesv4ehCShUuIxkaxrsROSLQr3kApW4xPO4=
 pgregory.net/rapid v0.3.3/go.mod h1:UYpPVyjFHzYBGHIxLFoupi8vwk6rXNzRY9OMvVxFIOU=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
diff --git a/vendor/knative.dev/pkg/configmap/parse.go b/vendor/knative.dev/pkg/configmap/parse.go
index 4c280757..faeacab1 100644
--- a/vendor/knative.dev/pkg/configmap/parse.go
+++ b/vendor/knative.dev/pkg/configmap/parse.go
@@ -141,7 +141,11 @@ func AsDuration(key string, target *time.Duration) ParseFunc {
 func AsStringSet(key string, target *sets.String) ParseFunc {
 	return func(data map[string]string) error {
 		if raw, ok := data[key]; ok {
-			*target = sets.NewString(strings.Split(raw, ",")...)
+			splitted := strings.Split(raw, ",")
+			for i, v := range splitted {
+				splitted[i] = strings.TrimSpace(v)
+			}
+			*target = sets.NewString(splitted...)
 		}
 		return nil
 	}
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 3bec78ec..65490869 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -569,7 +569,7 @@ k8s.io/utils/trace
 # knative.dev/hack v0.0.0-20210806075220-815cd312d65c
 ## explicit
 knative.dev/hack
-# knative.dev/pkg v0.0.0-20210823133635-12d915ede293
+# knative.dev/pkg v0.0.0-20210824120823-a94f5f07b3c3
 ## explicit
 knative.dev/pkg/apis
 knative.dev/pkg/apis/duck