diff --git a/pkgs/applications/science/math/sage/sage-src.nix b/pkgs/applications/science/math/sage/sage-src.nix
index 75cd308da400..bc17147c16a7 100644
--- a/pkgs/applications/science/math/sage/sage-src.nix
+++ b/pkgs/applications/science/math/sage/sage-src.nix
@@ -144,6 +144,13 @@ stdenv.mkDerivation rec {
       url = "https://git.sagemath.org/sage.git/patch/?id=f570e3a7fc2965764b84c04ce301a88ded2c42df";
       sha256 = "0l5c4giixkn15v2a06sfzq5mkxila6l67zkjbacirwprrlpcnmmp";
     })
+
+    # https://trac.sagemath.org/ticket/27420
+    (fetchpatch {
+      name = "cypari-2.1.patch";
+      url = "https://git.sagemath.org/sage.git/patch/?id=e351bf2f2914e683d5e2028597c45ae8d1b7f855";
+      sha256 = "00faa7fl0vaqcqbw0bidkhl78qa8l34d3a07zirbcl0vm74bdn1p";
+    })
   ];
 
   patches = nixPatches ++ bugfixPatches ++ packageUpgradePatches;
diff --git a/pkgs/development/python-modules/cypari2/default.nix b/pkgs/development/python-modules/cypari2/default.nix
index 1e1248591f0c..a4921b85e370 100644
--- a/pkgs/development/python-modules/cypari2/default.nix
+++ b/pkgs/development/python-modules/cypari2/default.nix
@@ -11,11 +11,11 @@
 buildPythonPackage rec {
   pname = "cypari2";
   # upgrade may break sage, please test the sage build or ping @timokau on upgrade
-  version = "2.0.3";
+  version = "2.1.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "0mghbmilmy34xp1d50xdx76sijqxmpkm2bcgx2v1mdji2ff7n0yc";
+    sha256 = "0bm5jvmwqp48n6b385mw4v7wsws9zk62mgb7xf5ymiq7k6wgvxli";
   };
 
   # This differs slightly from the default python installPhase in that it pip-installs