diff --git a/synth.metadata b/synth.metadata
index 1539ae5..907aa6f 100644
--- a/synth.metadata
+++ b/synth.metadata
@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/google-api-python-client.git",
-        "sha": "cc94ec86e652769e9d3d5cb6d6491efb8d76dd21"
+        "sha": "4576f024c5c021e50e912ea5768213ab293c2593"
       }
     },
     {
@@ -18,7 +18,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "fb53b6fb373b7c3edf4e55f3e8036bc6d73fa483"
+        "sha": "573f7655311b553a937f9123bee17bf78497db95"
       }
     }
   ],
@@ -28,6 +28,7 @@
     ".github/ISSUE_TEMPLATE/feature_request.md",
     ".github/ISSUE_TEMPLATE/support_request.md",
     ".github/PULL_REQUEST_TEMPLATE.md",
+    ".github/header-checker-lint.yml",
     ".github/release-please.yml",
     ".github/snippet-bot.yml",
     ".kokoro/build.sh",