diff --git a/setup.py b/setup.py
index 105e034..37092ce 100644
--- a/setup.py
+++ b/setup.py
@@ -15,7 +15,7 @@
     license='MIT',
     packages = find_packages(exclude=['docs', 'tests*']),
     install_requires=[
-        'cryptography==37.0.4', # because later versions require rust
+        'cryptography==39.0.1', # because later versions require rust
     ],
     extras_require = {
         'test': ['coverage', 'pytest', 'pytest-cov'],