diff --git a/pkgs/development/python-modules/pysaml2/default.nix b/pkgs/development/python-modules/pysaml2/default.nix
index 81324920c431acd..b4552b264d5ad25 100644
--- a/pkgs/development/python-modules/pysaml2/default.nix
+++ b/pkgs/development/python-modules/pysaml2/default.nix
@@ -2,6 +2,7 @@
 , buildPythonPackage
 , isPy3k
 , fetchFromGitHub
+, fetchpatch
 , substituteAll
 , xmlsec
 , cryptography, defusedxml, future, pyopenssl, dateutil, pytz, requests, six
@@ -27,6 +28,12 @@ buildPythonPackage rec {
       src = ./hardcode-xmlsec1-path.patch;
       inherit xmlsec;
     })
+    # remove on next release
+    (fetchpatch {
+      name = "fix-test-dates.patch";
+      url = "https://github.com/IdentityPython/pysaml2/commit/1d97d2d26f63e42611558fdd0e439bb8a7496a27.patch";
+      sha256 = "0r6d6hkk6z9yw7aqnsnylii516ysmdsc8dghwmgnwvw6cm7l388p";
+    })
   ];
 
   propagatedBuildInputs = [ cryptography defusedxml future pyopenssl dateutil pytz requests six ];