diff --git a/RecaptchaEnterprise/metadata/V1/Recaptchaenterprise.php b/RecaptchaEnterprise/metadata/V1/Recaptchaenterprise.php
index c7e9e4a574c1..0577623efb24 100644
Binary files a/RecaptchaEnterprise/metadata/V1/Recaptchaenterprise.php and b/RecaptchaEnterprise/metadata/V1/Recaptchaenterprise.php differ
diff --git a/RecaptchaEnterprise/src/V1/RiskAnalysis.php b/RecaptchaEnterprise/src/V1/RiskAnalysis.php
index 46356d7be939..378bf2563756 100644
--- a/RecaptchaEnterprise/src/V1/RiskAnalysis.php
+++ b/RecaptchaEnterprise/src/V1/RiskAnalysis.php
@@ -36,6 +36,12 @@ class RiskAnalysis extends \Google\Protobuf\Internal\Message
      * Generated from protobuf field <code>repeated string extended_verdict_reasons = 3 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>
      */
     private $extended_verdict_reasons;
+    /**
+     * Output only. Challenge information for SCORE_AND_CHALLENGE keys
+     *
+     * Generated from protobuf field <code>.google.cloud.recaptchaenterprise.v1.RiskAnalysis.Challenge challenge = 4 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>
+     */
+    private $challenge = 0;
 
     /**
      * Constructor.
@@ -52,6 +58,8 @@ class RiskAnalysis extends \Google\Protobuf\Internal\Message
      *     @type array<string>|\Google\Protobuf\Internal\RepeatedField $extended_verdict_reasons
      *           Output only. Extended verdict reasons to be used for experimentation only.
      *           The set of possible reasons is subject to change.
+     *     @type int $challenge
+     *           Output only. Challenge information for SCORE_AND_CHALLENGE keys
      * }
      */
     public function __construct($data = NULL) {
@@ -143,5 +151,31 @@ public function setExtendedVerdictReasons($var)
         return $this;
     }
 
+    /**
+     * Output only. Challenge information for SCORE_AND_CHALLENGE keys
+     *
+     * Generated from protobuf field <code>.google.cloud.recaptchaenterprise.v1.RiskAnalysis.Challenge challenge = 4 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>
+     * @return int
+     */
+    public function getChallenge()
+    {
+        return $this->challenge;
+    }
+
+    /**
+     * Output only. Challenge information for SCORE_AND_CHALLENGE keys
+     *
+     * Generated from protobuf field <code>.google.cloud.recaptchaenterprise.v1.RiskAnalysis.Challenge challenge = 4 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setChallenge($var)
+    {
+        GPBUtil::checkEnum($var, \Google\Cloud\RecaptchaEnterprise\V1\RiskAnalysis\Challenge::class);
+        $this->challenge = $var;
+
+        return $this;
+    }
+
 }
 
diff --git a/RecaptchaEnterprise/src/V1/RiskAnalysis/Challenge.php b/RecaptchaEnterprise/src/V1/RiskAnalysis/Challenge.php
new file mode 100644
index 000000000000..52ab37b3ff85
--- /dev/null
+++ b/RecaptchaEnterprise/src/V1/RiskAnalysis/Challenge.php
@@ -0,0 +1,72 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/cloud/recaptchaenterprise/v1/recaptchaenterprise.proto
+
+namespace Google\Cloud\RecaptchaEnterprise\V1\RiskAnalysis;
+
+use UnexpectedValueException;
+
+/**
+ * Challenge information for SCORE_AND_CHALLENGE keys
+ *
+ * Protobuf type <code>google.cloud.recaptchaenterprise.v1.RiskAnalysis.Challenge</code>
+ */
+class Challenge
+{
+    /**
+     * Default unspecified type.
+     *
+     * Generated from protobuf enum <code>CHALLENGE_UNSPECIFIED = 0;</code>
+     */
+    const CHALLENGE_UNSPECIFIED = 0;
+    /**
+     * No challenge was presented for solving.
+     *
+     * Generated from protobuf enum <code>NOCAPTCHA = 1;</code>
+     */
+    const NOCAPTCHA = 1;
+    /**
+     * A solution was submitted that was correct.
+     *
+     * Generated from protobuf enum <code>PASSED = 2;</code>
+     */
+    const PASSED = 2;
+    /**
+     * A solution was submitted that was incorrect or otherwise
+     * deemed suspicious.
+     *
+     * Generated from protobuf enum <code>FAILED = 3;</code>
+     */
+    const FAILED = 3;
+
+    private static $valueToName = [
+        self::CHALLENGE_UNSPECIFIED => 'CHALLENGE_UNSPECIFIED',
+        self::NOCAPTCHA => 'NOCAPTCHA',
+        self::PASSED => 'PASSED',
+        self::FAILED => 'FAILED',
+    ];
+
+    public static function name($value)
+    {
+        if (!isset(self::$valueToName[$value])) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no name defined for value %s', __CLASS__, $value));
+        }
+        return self::$valueToName[$value];
+    }
+
+
+    public static function value($name)
+    {
+        $const = __CLASS__ . '::' . strtoupper($name);
+        if (!defined($const)) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no value defined for name %s', __CLASS__, $name));
+        }
+        return constant($const);
+    }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(Challenge::class, \Google\Cloud\RecaptchaEnterprise\V1\RiskAnalysis_Challenge::class);
+