diff --git a/pkgs/development/libraries/openturns/default.nix b/pkgs/development/libraries/openturns/default.nix
index 4c80c4b9ac8..d6735e77d46 100644
--- a/pkgs/development/libraries/openturns/default.nix
+++ b/pkgs/development/libraries/openturns/default.nix
@@ -26,24 +26,15 @@
 
 stdenv.mkDerivation rec {
   pname = "openturns";
-  version = "1.20";
+  version = "1.21";
 
   src = fetchFromGitHub {
     owner = "openturns";
     repo = "openturns";
     rev = "v${version}";
-    sha256 = "sha256-QeapH937yGnK6oD+rgIERePxz6ooxGpOx6x9LyFDt2A=";
+    sha256 = "sha256-zWCwuxJEiyhnllVCsfm3zNz2Xorvuj2Vl2fufS3qixY=";
   };
 
-  patches = [
-    # Fix build with primesieve 11, https://github.com/openturns/openturns/pull/2187
-    # Remove with next version update.
-    (fetchpatch {
-      url = "https://github.com/openturns/openturns/commit/a85061f89a5763061467beac516c1355fe81b9be.patch";
-      hash = "sha256-z28ipBuX3b5UFEnKuDfp+kMI5cUcwXVz/8WZHlICnvE=";
-    })
-  ];
-
   nativeBuildInputs = [ cmake ] ++ lib.optional enablePython python3Packages.sphinx;
   buildInputs = [
     swig
@@ -84,6 +75,7 @@ stdenv.mkDerivation rec {
     description = "Multivariate probabilistic modeling and uncertainty treatment library";
     license = with licenses; [ lgpl3 gpl3 ];
     homepage = "https://openturns.github.io/www/";
+    changelog = "https://github.com/openturns/openturns/raw/v${version}/ChangeLog";
     maintainers = with maintainers; [ gdinh ];
     platforms = platforms.unix;
   };