diff --git a/pkgs/applications/science/math/pari/default.nix b/pkgs/applications/science/math/pari/default.nix
index d876875268b7..39f663cb50fd 100644
--- a/pkgs/applications/science/math/pari/default.nix
+++ b/pkgs/applications/science/math/pari/default.nix
@@ -14,7 +14,7 @@ assert withThread -> libpthreadstubs != null;
 
 stdenv.mkDerivation rec {
   pname = "pari";
-  version = "2.15.5";
+  version = "2.17.1";
 
   src = fetchurl {
     urls = [
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
       # old versions are at the url below
       "https://pari.math.u-bordeaux.fr/pub/pari/OLD/${lib.versions.majorMinor version}/${pname}-${version}.tar.gz"
     ];
-    hash = "sha256-Dv3adRXZ2VT2MyTDSzTFYOYPc6gcOSSnEmCizJHV+YE=";
+    hash = "sha256-Z7pvMHEjNyUlhUHk8XS177xkxlrlEVut6e38RfH95dw=";
   };
 
   buildInputs = [
diff --git a/pkgs/by-name/sa/sage/sage-src.nix b/pkgs/by-name/sa/sage/sage-src.nix
index e34dc32019c5..16ff02bcafa5 100644
--- a/pkgs/by-name/sa/sage/sage-src.nix
+++ b/pkgs/by-name/sa/sage/sage-src.nix
@@ -82,6 +82,13 @@ stdenv.mkDerivation rec {
       url = "https://github.com/sagemath/sage/commit/f10a6d04599795732c1d99e2da0a4839ccdcb4f5.diff";
       hash = "sha256-xB0xg8dGLnSMdFK3/B5hkI9yzI5N3lUMhPZ89lDsp3s=";
     })
+
+    # https://github.com/sagemath/sage/pull/38749, to land in 10.6.beta6
+    (fetchpatch {
+      name = "pari-2.17.1-update.patch";
+      url = "https://github.com/sagemath/sage/compare/10.6.beta2...26f411e5939718d4439325ff669635e5a72d50e5.diff";
+      hash = "sha256-Z4JwCuUDpqktAzNtVKRUbrJEh7TmCtFI7PJnOrcEbr4=";
+    })
   ];
 
   patches = nixPatches ++ bugfixPatches ++ packageUpgradePatches;
diff --git a/pkgs/development/python-modules/cysignals/default.nix b/pkgs/development/python-modules/cysignals/default.nix
index 9e90eaf38f19..df27cb4c17e9 100644
--- a/pkgs/development/python-modules/cysignals/default.nix
+++ b/pkgs/development/python-modules/cysignals/default.nix
@@ -1,8 +1,8 @@
 {
   lib,
-  autoreconfHook,
   fetchPypi,
   buildPythonPackage,
+  meson-python,
   cython,
   pariSupport ? true,
   pari, # for interfacing with the PARI/GP signal handler
@@ -15,14 +15,19 @@ assert pariSupport -> pari != null;
 
 buildPythonPackage rec {
   pname = "cysignals";
-  version = "1.11.4";
-  format = "setuptools";
+  version = "1.12.3";
+  pyproject = true;
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-Dx4yHlWgf5AchqNqHkSX9v+d/nAGgdATCjjDbk6yOMM=";
+    hash = "sha256-ifdibb8p21qz1u/xWomXj061GTwyDpCZvMFX2s3v0es=";
   };
 
+  build-system = [
+    cython
+    meson-python
+  ];
+
   # explicit check:
   # build/src/cysignals/implementation.c:27:2: error: #error "cysignals must be compiled without _FORTIFY_SOURCE"
   hardeningDisable = [ "fortify" ];
@@ -45,8 +50,6 @@ buildPythonPackage rec {
       pari
     ];
 
-  nativeBuildInputs = [ autoreconfHook ];
-
   enableParallelBuilding = true;
 
   passthru.tests = {