diff --git a/setup.py b/setup.py
index 7070877c..10d6e213 100644
--- a/setup.py
+++ b/setup.py
@@ -39,6 +39,7 @@
 
 dependencies = [
     "google-api-core[grpc] >= 1.34.0, <3.0.0dev,!=2.0.*,!=2.1.*,!=2.2.*,!=2.3.*,!=2.4.*,!=2.5.*,!=2.6.*,!=2.7.*,!=2.8.*,!=2.9.*,!=2.10.*",
+    "google-auth >= 2.14.1, <3.0.0dev",
     "proto-plus >= 1.22.0, <2.0.0dev",
     "proto-plus >= 1.22.2, <2.0.0dev; python_version>='3.11'",
     "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
diff --git a/testing/constraints-3.7.txt b/testing/constraints-3.7.txt
index e3ff3105..118931ee 100644
--- a/testing/constraints-3.7.txt
+++ b/testing/constraints-3.7.txt
@@ -5,6 +5,7 @@
 # e.g., if setup.py has "google-cloud-foo >= 1.14.0, < 2.0.0dev",
 # Then this file should have google-cloud-foo==1.14.0
 google-api-core==1.34.0
+google-auth==2.14.1
 proto-plus==1.22.0
 libcst==0.2.5
 fastavro==0.21.2