diff --git a/Spanner/metadata/V1/Type.php b/Spanner/metadata/V1/Type.php
index 2f79e32151c8..aff66adb2442 100644
Binary files a/Spanner/metadata/V1/Type.php and b/Spanner/metadata/V1/Type.php differ
diff --git a/Spanner/src/V1/TransactionOptions/PBReadOnly.php b/Spanner/src/V1/TransactionOptions/PBReadOnly.php
index f8eed828decb..89e2128e168f 100644
--- a/Spanner/src/V1/TransactionOptions/PBReadOnly.php
+++ b/Spanner/src/V1/TransactionOptions/PBReadOnly.php
@@ -1,5 +1,4 @@
 <?php
-
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: google/spanner/v1/transaction.proto
 
@@ -348,3 +347,5 @@ public function getTimestampBound()
 
 // Adding a class alias for backwards compatibility with the previous class name.
 class_alias(PBReadOnly::class, \Google\Cloud\Spanner\V1\TransactionOptions_ReadOnly::class);
+
+
diff --git a/Spanner/src/V1/TypeAnnotationCode.php b/Spanner/src/V1/TypeAnnotationCode.php
index fd000de4a241..0c6baccfe6c6 100644
--- a/Spanner/src/V1/TypeAnnotationCode.php
+++ b/Spanner/src/V1/TypeAnnotationCode.php
@@ -34,10 +34,22 @@ class TypeAnnotationCode
      * Generated from protobuf enum <code>PG_NUMERIC = 2;</code>
      */
     const PG_NUMERIC = 2;
+    /**
+     * PostgreSQL compatible JSONB type. This annotation needs to be applied to
+     * [Type][google.spanner.v1.Type] instances having [JSON][google.spanner.v1.TypeCode.JSON]
+     * type code to specify that values of this type should be treated as
+     * PostgreSQL JSONB values. Currently this annotation is always needed for
+     * [JSON][google.spanner.v1.TypeCode.JSON] when a client interacts with PostgreSQL-enabled
+     * Spanner databases.
+     *
+     * Generated from protobuf enum <code>PG_JSONB = 3;</code>
+     */
+    const PG_JSONB = 3;
 
     private static $valueToName = [
         self::TYPE_ANNOTATION_CODE_UNSPECIFIED => 'TYPE_ANNOTATION_CODE_UNSPECIFIED',
         self::PG_NUMERIC => 'PG_NUMERIC',
+        self::PG_JSONB => 'PG_JSONB',
     ];
 
     public static function name($value)