diff --git a/packages/google-cloud-os-login/testing/constraints-3.7.txt b/packages/google-cloud-os-login/testing/constraints-3.7.txt
index e69de29bb2d1..3b53664cacdc 100644
--- a/packages/google-cloud-os-login/testing/constraints-3.7.txt
+++ b/packages/google-cloud-os-login/testing/constraints-3.7.txt
@@ -0,0 +1,11 @@
+# This constraints file is used to check that lower bounds
+# are correct in setup.py
+# List *all* library dependencies and extras in this file.
+# Pin the version to the lower bound.
+#
+# e.g., if setup.py has "foo >= 1.14.0, < 2.0.0dev",
+# Then this file should have foo==1.14.0
+google-api-core==1.31.5
+proto-plus==1.15.0
+libcst==0.2.5
+protobuf==3.19.0