diff --git a/.github/header-checker-lint.yml b/.github/header-checker-lint.yml
index f2f5683523f5..3fb897b96d4d 100644
--- a/.github/header-checker-lint.yml
+++ b/.github/header-checker-lint.yml
@@ -1,6 +1,6 @@
 {"allowedCopyrightHolders": ["Google LLC", "Google, Inc"],
  "allowedLicenses": ["Apache-2.0", "MIT", "BSD-3"],
- "ignoreFiles": ["**/requirements.txt", "**/requirements-test.txt", "**/requirements-composer.txt", "**/__init__.py"],
+ "ignoreFiles": ["**/requirements.txt", "**/requirements-test.txt", "**/requirements-composer.txt", "**/__init__.py", "**/constraints.txt", "**/constraints-test.txt"],
  "sourceFileExtensions": [
  	"ts",
  	"js",
diff --git a/noxfile-template.py b/noxfile-template.py
index 1b11728e6f53..8d8d188229ad 100644
--- a/noxfile-template.py
+++ b/noxfile-template.py
@@ -175,10 +175,14 @@ def blacken(session: nox.sessions.Session) -> None:
 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")
+      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")
+      session.install("-r", "requirements-test.txt")
 
     if INSTALL_LIBRARY_FROM_SOURCE:
         session.install("-e", _get_repo_root())
diff --git a/renovate.json b/renovate.json
index a78e567856d8..1ffa7996b02e 100644
--- a/renovate.json
+++ b/renovate.json
@@ -6,9 +6,8 @@
   "rebaseWhen": "never",
   "masterIssue": true,
   "pip_requirements": {
-    "fileMatch": ["requirements-test.txt", "requirements-composer.txt"]
+    "fileMatch": ["requirements-test.txt", "requirements-composer.txt", "constraints.txt", "constraints-test.txt"]
   },
-  "ignoreDeps":["cattrs"],
   "packageRules": [
     {
       "packagePatterns": ["pytest"],