diff --git a/synthtool/gcp/templates/python_library/.github/header-checker-lint.yml b/synthtool/gcp/templates/python_library/.github/header-checker-lint.yml
index fc281c05b..6fe78aa79 100644
--- a/synthtool/gcp/templates/python_library/.github/header-checker-lint.yml
+++ b/synthtool/gcp/templates/python_library/.github/header-checker-lint.yml
@@ -1,6 +1,6 @@
 {"allowedCopyrightHolders": ["Google LLC"],
  "allowedLicenses": ["Apache-2.0", "MIT", "BSD-3"],
- "ignoreFiles": ["**/requirements.txt", "**/requirements-test.txt"],
+ "ignoreFiles": ["**/requirements.txt", "**/requirements-test.txt", "**/__init__.py", "samples/**/constraints.txt", "samples/**/constraints-test.txt"],
  "sourceFileExtensions": [
  	"ts", 
  	"js", 
diff --git a/synthtool/gcp/templates/python_library/renovate.json b/synthtool/gcp/templates/python_library/renovate.json
index f08bc22c9..c04895563 100644
--- a/synthtool/gcp/templates/python_library/renovate.json
+++ b/synthtool/gcp/templates/python_library/renovate.json
@@ -2,5 +2,8 @@
   "extends": [
     "config:base",  ":preserveSemverRanges"
   ],
-  "ignorePaths": [".pre-commit-config.yaml"]
+  "ignorePaths": [".pre-commit-config.yaml"],
+  "pip_requirements": {
+    "fileMatch": ["requirements-test.txt", "samples/[\\S/]*constraints.txt", "samples/[\\S/]*constraints-test.txt"]
+  }
 }
diff --git a/synthtool/gcp/templates/python_samples/noxfile.py.j2 b/synthtool/gcp/templates/python_samples/noxfile.py.j2
index 97bf7da80..956cdf4f9 100644
--- a/synthtool/gcp/templates/python_samples/noxfile.py.j2
+++ b/synthtool/gcp/templates/python_samples/noxfile.py.j2
@@ -172,10 +172,16 @@ PYTEST_COMMON_ARGS = ["--junitxml=sponge_log.xml"]
 def _session_tests(session: nox.sessions.Session, post_install: Callable = None) -> None:
     """Runs py.test for a particular project."""
     if os.path.exists("requirements.txt"):
-        session.install("-r", "requirements.txt")
+        if os.path.exists("constraints.txt"):
+            session.install("-r", "requirements.txt", "-c", "constraints.txt")
+        else:
+            session.install("-r", "requirements.txt")
 
     if os.path.exists("requirements-test.txt"):
-        session.install("-r", "requirements-test.txt")
+        if os.path.exists("constraints-test.txt"):
+            session.install("-r", "requirements-test.txt", "-c", "constraints-test.txt")
+        else:
+            session.install("-r", "requirements-test.txt")
 
     if INSTALL_LIBRARY_FROM_SOURCE:
         session.install("-e", _get_repo_root())