diff --git a/pkgs/development/python-modules/pyhanko/default.nix b/pkgs/development/python-modules/pyhanko/default.nix
index 30b7533e7de4..ab7898a73fd9 100644
--- a/pkgs/development/python-modules/pyhanko/default.nix
+++ b/pkgs/development/python-modules/pyhanko/default.nix
@@ -39,18 +39,22 @@
 
 buildPythonPackage rec {
   pname = "pyhanko";
-  version = "0.25.1";
+  version = "0.25.3";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "MatthiasValvekens";
     repo = "pyHanko";
     rev = "refs/tags/v${version}";
-    hash = "sha256-keWAiqwaMZYh92B0mlR4+jjxBKLOAJ9Kgc0l0GiIQbc=";
+    hash = "sha256-HJkCQ5YDVr17gtY4PW89ep7GwFdP21/ruBEKm7j3+Qo=";
   };
 
   build-system = [ setuptools ];
 
+  pythonRelaxDeps = [
+    "cryptography"
+  ];
+
   dependencies = [
     asn1crypto
     click