diff --git a/src/ConvertKit_API_Traits.php b/src/ConvertKit_API_Traits.php
index 71f2175..927dca2 100644
--- a/src/ConvertKit_API_Traits.php
+++ b/src/ConvertKit_API_Traits.php
@@ -585,6 +585,23 @@ public function create_tags(array $tags, string $callback_url = '')
         );
     }
 
+    /**
+     * Updates the name of a tag.
+     *
+     * @param integer $tag_id Tag ID.
+     * @param string  $name   New name.
+     *
+     * @since 2.2.1
+     *
+     * @see https://developers.kit.com/api-reference/tags/update-tag-name
+     *
+     * @return false|mixed
+     */
+    public function update_tag_name(int $tag_id, string $name)
+    {
+        return $this->put(sprintf('tags/%s', $tag_id), ['name' => $name]);
+    }
+
     /**
      * Tags a subscriber with the given existing Tag.
      *
diff --git a/tests/ConvertKitAPITest.php b/tests/ConvertKitAPITest.php
index e05a025..54ec07d 100644
--- a/tests/ConvertKitAPITest.php
+++ b/tests/ConvertKitAPITest.php
@@ -1722,6 +1722,59 @@ public function testCreateTagsThatExist()
         $this->assertEquals($result->tags[0]->name, $_ENV['CONVERTKIT_API_TAG_NAME_2']);
     }
 
+    /**
+     * Test that update_tag_name() returns the expected data.
+     *
+     * @since   2.2.1
+     *
+     * @return void
+     */
+    public function testUpdateTagName()
+    {
+        $result = $this->api->update_tag_name(
+            tag_id: (int) $_ENV['CONVERTKIT_API_TAG_ID'],
+            name: $_ENV['CONVERTKIT_API_TAG_NAME'],
+        );
+
+        // Assert existing tag is returned.
+        $this->assertEquals($result->tag->id, (int) $_ENV['CONVERTKIT_API_TAG_ID']);
+        $this->assertEquals($result->tag->name, $_ENV['CONVERTKIT_API_TAG_NAME']);
+    }
+
+    /**
+     * Test that update_tag_name() throws a ClientException when an invalid
+     * tag ID is specified.
+     *
+     * @since   2.2.1
+     *
+     * @return void
+     */
+    public function testUpdateTagNameWithInvalidTagID()
+    {
+        $this->expectException(ClientException::class);
+        $result = $this->api->update_tag_name(
+            tag_id: 12345,
+            name: $_ENV['CONVERTKIT_API_TAG_NAME'],
+        );
+    }
+
+    /**
+     * Test that update_tag_name() throws a ClientException when a blank
+     * name is specified.
+     *
+     * @since   2.2.1
+     *
+     * @return void
+     */
+    public function testUpdateTagNameWithBlankName()
+    {
+        $this->expectException(ClientException::class);
+        $result = $this->api->update_tag_name(
+            tag_id: (int) $_ENV['CONVERTKIT_API_TAG_ID'],
+            name: ''
+        );
+    }
+
     /**
      * Test that tag_subscriber_by_email() returns the expected data.
      *