diff --git a/pkgs/development/python-modules/modelcif/default.nix b/pkgs/development/python-modules/modelcif/default.nix
index 21573c1c65a1..e8b03321620f 100644
--- a/pkgs/development/python-modules/modelcif/default.nix
+++ b/pkgs/development/python-modules/modelcif/default.nix
@@ -9,14 +9,14 @@
 
 buildPythonPackage rec {
   pname = "modelcif";
-  version = "1.2";
+  version = "1.3";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "ihmwg";
     repo = "python-modelcif";
     tag = version;
-    hash = "sha256-sduhRLtuJ/0BNsqmrhCr0lSrLMaOfE+TCWN4zj62aCQ=";
+    hash = "sha256-3wuKD6oQp3QdsWRpYsnC5IPpVRcQVDERSClEKJko3dg=";
   };
 
   build-system = [