diff --git a/pkgs/development/python-modules/pyhanko-certvalidator/default.nix b/pkgs/development/python-modules/pyhanko-certvalidator/default.nix
index 2429eefee5ff..396d7eb277c5 100644
--- a/pkgs/development/python-modules/pyhanko-certvalidator/default.nix
+++ b/pkgs/development/python-modules/pyhanko-certvalidator/default.nix
@@ -19,14 +19,14 @@
 
 buildPythonPackage rec {
   pname = "pyhanko-certvalidator";
-  version = "0.29.1";
+  version = "0.31.1";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "MatthiasValvekens";
     repo = "pyhanko";
     tag = "pyhanko-certvalidator/v${version}";
-    hash = "sha256-+576MAbtWFGaPu/HqhdeeRNHi84pLnDaMDa0e/J/CUs=";
+    hash = "sha256-mZ9u3mQ8JZIq+G1iwNQST8r7/rCWi/UW0j1xfeV9zFM=";
   };
 
   sourceRoot = "${src.name}/pkgs/pyhanko-certvalidator";