diff --git a/nix/pkgs/default.nix b/nix/pkgs/default.nix
index 3ea7ba6..8301488 100644
--- a/nix/pkgs/default.nix
+++ b/nix/pkgs/default.nix
@@ -88,7 +88,7 @@ in rec {
   staruml = pkgs.callPackage ../pkgs/staruml.nix { inherit (pkgs.gnome2) GConf; libgcrypt = pkgs.libgcrypt_1_5; };
 
   pythonPackages = myPython;
-  myPython = pkgs.python39.withPackages (ps: with ps; [
+  myPython = pkgs.python310.withPackages (ps: with ps; [
     pep8 yapf flake8
     # autopep8 (broken)
     # pylint (broken)
@@ -102,7 +102,7 @@ in rec {
     cffi
     pyopenssl
     urllib3
-    mistune
+    # mistune (insecure)
     sympy
 
     flask