diff --git a/packages/google-auth/setup.py b/packages/google-auth/setup.py
index 87e7c2502196..ab9119b4c1a7 100644
--- a/packages/google-auth/setup.py
+++ b/packages/google-auth/setup.py
@@ -19,7 +19,8 @@
 from setuptools import setup
 
 cryptography_base_require = [
-    "cryptography >= 38.0.3",
+    "cryptography >= 38.0.3; python_version < '3.14'",
+    "cryptography >= 41.0.5; python_version >= '3.14'",
 ]
 
 DEPENDENCIES = (
diff --git a/packages/google-auth/testing/constraints-3.14.txt b/packages/google-auth/testing/constraints-3.14.txt
index e69de29bb2d1..abdcf9de1e42 100644
--- a/packages/google-auth/testing/constraints-3.14.txt
+++ b/packages/google-auth/testing/constraints-3.14.txt
@@ -0,0 +1,4 @@
+# Lower-bound constraints for Python 3.14 core dependencies.
+# Used during CI unit tests to verify minimum supported package versions.
+pyasn1-modules==0.2.1
+cryptography==41.0.5