diff --git a/packages/google-cloud-tasks/noxfile.py b/packages/google-cloud-tasks/noxfile.py
index 6e69bfe0be16..72b38757056a 100644
--- a/packages/google-cloud-tasks/noxfile.py
+++ b/packages/google-cloud-tasks/noxfile.py
@@ -123,6 +123,9 @@ def system(session):
     # Sanity check: Only run tests if the environment variable is set.
     if not os.environ.get("GOOGLE_APPLICATION_CREDENTIALS", ""):
         session.skip("Credentials must be set via environment variable")
+    # Install pyopenssl for mTLS testing.
+    if os.environ.get("GOOGLE_API_USE_CLIENT_CERTIFICATE", "false") == "true":
+        session.install("pyopenssl")
 
     system_test_exists = os.path.exists(system_test_path)
     system_test_folder_exists = os.path.exists(system_test_folder_path)
diff --git a/packages/google-cloud-tasks/synth.metadata b/packages/google-cloud-tasks/synth.metadata
index ddc3f4edf311..cf3a65c11be5 100644
--- a/packages/google-cloud-tasks/synth.metadata
+++ b/packages/google-cloud-tasks/synth.metadata
@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/python-tasks.git",
-        "sha": "a5d3e8a969ee47eb79872c50b0644f9e3d37def1"
+        "sha": "e4865024dd3acf6a8f7e64712f19f5369ee30202"
       }
     },
     {
@@ -19,14 +19,14 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "79ab0b44a2cc7d803d07c107f9faf07729fc4012"
+        "sha": "0780323da96d5a53925fe0547757181fe76e8f1e"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "79ab0b44a2cc7d803d07c107f9faf07729fc4012"
+        "sha": "0780323da96d5a53925fe0547757181fe76e8f1e"
       }
     }
   ],