diff --git a/pkgs/applications/misc/tandoor-recipes/default.nix b/pkgs/applications/misc/tandoor-recipes/default.nix
index 2dde47d25f27..cdd143cc766d 100644
--- a/pkgs/applications/misc/tandoor-recipes/default.nix
+++ b/pkgs/applications/misc/tandoor-recipes/default.nix
@@ -5,7 +5,20 @@
 , fetchpatch
 }:
 let
-  python = python3;
+  python = python3.override {
+    packageOverrides = self: super: {
+      validators = super.validators.overridePythonAttrs (_: rec {
+        version = "0.20.0";
+        src = fetchFromGitHub {
+          owner = "python-validators";
+          repo = "validators";
+          rev = version;
+          hash = "sha256-ZnLyTHlsrXthGnaPzlV2ga/UTm5SSEHLTwC/tobiPak=";
+        };
+        propagatedBuildInputs = [ super.decorator super.six ];
+      });
+    };
+  };
 
   common = callPackage ./common.nix { };