diff --git a/setup.py b/setup.py
index 1713609..6eb5961 100644
--- a/setup.py
+++ b/setup.py
@@ -22,7 +22,7 @@ def get_packages(package):
 
 
 def get_install_requires():
-    crypto_lib = 'pycryptodome >=3.3.1, <3.4.0'
+    crypto_lib = 'pycryptodome >=3.3.1, <3.9.4'
     return [
         crypto_lib,
         'six <2.0',