diff --git a/pkgs/development/python-modules/casbin/default.nix b/pkgs/development/python-modules/casbin/default.nix
index 6d86ccb95430..6057a770e0ac 100644
--- a/pkgs/development/python-modules/casbin/default.nix
+++ b/pkgs/development/python-modules/casbin/default.nix
@@ -8,7 +8,7 @@
 
 buildPythonPackage rec {
   pname = "casbin";
-  version = "0.18.3";
+  version = "0.18.4";
 
   disabled = isPy27;
 
@@ -16,7 +16,7 @@ buildPythonPackage rec {
     owner = pname;
     repo = "pycasbin";
     rev = "v${version}";
-    sha256 = "1wbwccwizndiww9a3x1jhixzpcg2qmqlxidk2rqnrzvp04lb8b0q";
+    sha256 = "16yhl1xgrgkyqnmbw9in3y7ypcxvvy21h32v50cd73a3iw4x27d0";
   };
 
   propagatedBuildInputs = [