diff --git a/setup.cfg b/setup.cfg
index c703b4b7..2a8cf599 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -44,7 +44,7 @@ docs =
     sphinx-rtd-theme
     zope.interface
 crypto =
-    cryptography>=3.3.1,<4.0.0
+    cryptography>=3.3.1
 tests =
     pytest>=6.0.0,<7.0.0
     coverage[toml]==5.0.4
@@ -52,7 +52,7 @@ dev =
     sphinx
     sphinx-rtd-theme
     zope.interface
-    cryptography>=3.3.1,<4.0.0
+    cryptography>=3.3.1
     pytest>=6.0.0,<7.0.0
     coverage[toml]==5.0.4
     mypy