diff --git a/pkgs/development/python-modules/model-checker/default.nix b/pkgs/development/python-modules/model-checker/default.nix
index 42766f8771f2..63e48787ae25 100644
--- a/pkgs/development/python-modules/model-checker/default.nix
+++ b/pkgs/development/python-modules/model-checker/default.nix
@@ -11,7 +11,7 @@
 
 buildPythonPackage rec {
   pname = "model-checker";
-  version = "0.9.19";
+  version = "0.9.20";
   pyproject = true;
 
   disabled = pythonOlder "3.8";
@@ -19,7 +19,7 @@ buildPythonPackage rec {
   src = fetchPypi {
     pname = "model_checker";
     inherit version;
-    hash = "sha256-OzK2TqEXujCdpOyS2qo5L8PAv8cfLLbiItD+OkzlyyI=";
+    hash = "sha256-n5wLf5iZ+pMXpXAy1K+SVC1fszCi0lr9LsqqEn8KU0w=";
   };
 
   # z3 does not provide a dist-info, so python-runtime-deps-check will fail