diff --git a/packages/google-auth/setup.py b/packages/google-auth/setup.py
index ab9119b4c1a7..a9fe43da8468 100644
--- a/packages/google-auth/setup.py
+++ b/packages/google-auth/setup.py
@@ -43,7 +43,7 @@
     "packaging >= 20.0",
 ]
 
-rsa_extra_require = ["rsa>=3.1.4,<5"]
+rsa_extra_require = ["rsa>=4.0.0,<5"]
 
 grpc_extra_require = [
     "grpcio >= 1.59.0, < 2.0.0; python_version < '3.14'",
diff --git a/packages/google-auth/testing/constraints-3.10.txt b/packages/google-auth/testing/constraints-3.10.txt
index 8cff9687ae59..e4feaad658ca 100644
--- a/packages/google-auth/testing/constraints-3.10.txt
+++ b/packages/google-auth/testing/constraints-3.10.txt
@@ -14,3 +14,4 @@ pyjwt==2.0
 grpcio==1.59.0
 urllib3==1.26.15
 packaging==20.0
+rsa==4.0.0