diff --git a/.changelog/1089.txt b/.changelog/1089.txt
new file mode 100644
index 00000000000..f0f86c220db
--- /dev/null
+++ b/.changelog/1089.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+user-agent-blocking-rules: add missing managed_challenge validation and removed the deprecated whitelist one
+```
\ No newline at end of file
diff --git a/user_agent.go b/user_agent.go
index 9e33ded4ad4..0c021424fc4 100644
--- a/user_agent.go
+++ b/user_agent.go
@@ -45,10 +45,10 @@ type UserAgentRuleListResponse struct {
 // API reference: https://api.cloudflare.com/#user-agent-blocking-rules-create-a-useragent-rule
 func (api *API) CreateUserAgentRule(ctx context.Context, zoneID string, ld UserAgentRule) (*UserAgentRuleResponse, error) {
 	switch ld.Mode {
-	case "block", "challenge", "js_challenge", "whitelist":
+	case "block", "challenge", "js_challenge", "managed_challenge":
 		break
 	default:
-		return nil, errors.New(`the User-Agent Block rule mode must be one of "block", "challenge", "js_challenge", "whitelist"`)
+		return nil, errors.New(`the User-Agent Block rule mode must be one of "block", "challenge", "js_challenge", "managed_challenge"`)
 	}
 
 	uri := fmt.Sprintf("/zones/%s/firewall/ua_rules", zoneID)