diff --git a/pkgs/development/python-modules/ypy-websocket/default.nix b/pkgs/development/python-modules/ypy-websocket/default.nix
index 70b9d9bfb0bf..b1840800622f 100644
--- a/pkgs/development/python-modules/ypy-websocket/default.nix
+++ b/pkgs/development/python-modules/ypy-websocket/default.nix
@@ -15,7 +15,7 @@
 
 buildPythonPackage rec {
   pname = "ypy-websocket";
-  version = "0.12.3";
+  version = "0.12.4";
   format = "pyproject";
 
   disabled = pythonOlder "3.7";
@@ -24,7 +24,7 @@ buildPythonPackage rec {
     owner = "y-crdt";
     repo = "ypy-websocket";
     rev = "refs/tags/v${version}";
-    hash = "sha256-gBLRjqsI2xx2z8qfaix4Gsm1rlNcjZ5g1PNVW7N4Q5k=";
+    hash = "sha256-48x+MUhev9dErC003XOP3oGKd5uOghlBFgcR8Nm/0xs=";
   };
 
   pythonRelaxDeps = [