diff --git a/pkgs/applications/science/math/sage/sage-src.nix b/pkgs/applications/science/math/sage/sage-src.nix
index be41c7219cc1..43ab175ce143 100644
--- a/pkgs/applications/science/math/sage/sage-src.nix
+++ b/pkgs/applications/science/math/sage/sage-src.nix
@@ -96,6 +96,14 @@ stdenv.mkDerivation rec {
       rev = "db10d327ade93711da735a599a67580524e6f7b4";
       sha256 = "09v87id25fa5r9snfn4mv79syhc77jxfawj5aizmdpwdmpgxjk1f";
     })
+
+    # https://trac.sagemath.org/ticket/26442
+    (fetchSageDiff {
+      name = "cypari2-2.0.3.patch";
+      base = "8.6.rc1";
+      rev = "cd62d45bcef93fb4f7ed62609a46135e6de07051";
+      sha256 = "08l2b9w0rn1zrha6188j72f7737xs126gkgmydjd31baa6367np2";
+    })
   ];
 
   patches = nixPatches ++ packageUpgradePatches;
diff --git a/pkgs/development/python-modules/cypari2/default.nix b/pkgs/development/python-modules/cypari2/default.nix
index c9f647d77b86..bf46bf9a182b 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 = "1.3.1";
+  version = "2.0.3";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "04f00xp8aaz37v00iqg1mv5wjq00a5qhk8cqa93s13009s9x984r";
+    sha256 = "0mghbmilmy34xp1d50xdx76sijqxmpkm2bcgx2v1mdji2ff7n0yc";
   };
 
   # This differs slightly from the default python installPhase in that it pip-installs