diff --git a/testing/constraints-3.7.txt b/testing/constraints-3.7.txt
index e69de29bb..455fa9b7b 100644
--- a/testing/constraints-3.7.txt
+++ b/testing/constraints-3.7.txt
@@ -0,0 +1,13 @@
+# 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
+google-cloud-core==1.4.1
+grpc-google-iam-v1==0.12.4
+proto-plus==1.18.0
+libcst==0.2.5
+protobuf==3.19.0