diff --git a/setup.cfg b/setup.cfg
index 428a7bc..34e96c9 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -23,7 +23,7 @@ packages = find:
 package_dir =
     =src
 install_requires =
-    aenum>=2.2.6,!=3.0.*,!=3.1.0,<3.2
+    aenum==2.2.6
 
 [options.packages.find]
 where = src