diff --git a/pkgs/by-name/pe/petsc/package.nix b/pkgs/by-name/pe/petsc/package.nix
index 8625d6b8eaac..4a0837cba019 100644
--- a/pkgs/by-name/pe/petsc/package.nix
+++ b/pkgs/by-name/pe/petsc/package.nix
@@ -110,13 +110,26 @@ let
 in
 stdenv.mkDerivation (finalAttrs: {
   pname = "petsc";
-  version = "3.23.7";
+  version = "3.24.0";
 
   src = fetchzip {
     url = "https://web.cels.anl.gov/projects/petsc/download/release-snapshots/petsc-${finalAttrs.version}.tar.gz";
-    hash = "sha256-6jP1EEYGMkttmEh0Fvtm0Fgp0NwHQlG21fY7cnLmXTI=";
+    hash = "sha256-5jqYTo5sfwLNByOlpry0zpI+q3u7ErwJJ97h7w5bvNQ=";
   };
 
+  patches = [
+    (replaceVars ./fix-petsc4py-install-prefix.patch {
+      PYTHON_SITEPACKAGES = python3Packages.python.sitePackages;
+    })
+  ];
+
+  postPatch = ''
+    patchShebangs ./lib/petsc/bin
+
+    substituteInPlace config/example_template.py \
+      --replace-fail "/usr/bin/env bash" "${bash}/bin/bash"
+  '';
+
   strictDeps = true;
 
   nativeBuildInputs = [
@@ -151,19 +164,6 @@ stdenv.mkDerivation (finalAttrs: {
 
   propagatedBuildInputs = lib.optional pythonSupport python3Packages.numpy;
 
-  patches = [
-    (replaceVars ./fix-petsc4py-install-prefix.patch {
-      PYTHON_SITEPACKAGES = python3Packages.python.sitePackages;
-    })
-  ];
-
-  postPatch = ''
-    patchShebangs ./lib/petsc/bin
-
-    substituteInPlace config/example_template.py \
-      --replace-fail "/usr/bin/env bash" "${bash}/bin/bash"
-  '';
-
   configureFlags = [
     "--with-blaslapack=1"
     "--with-scalar-type=${scalarType}"
diff --git a/pkgs/by-name/sl/slepc/package.nix b/pkgs/by-name/sl/slepc/package.nix
index 009dfbaa2c90..02a989552844 100644
--- a/pkgs/by-name/sl/slepc/package.nix
+++ b/pkgs/by-name/sl/slepc/package.nix
@@ -15,13 +15,13 @@ assert petsc.mpiSupport;
 assert pythonSupport -> petsc.pythonSupport;
 stdenv.mkDerivation (finalAttrs: {
   pname = "slepc";
-  version = "3.23.3";
+  version = "3.24.0";
 
   src = fetchFromGitLab {
     owner = "slepc";
     repo = "slepc";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-j0sUJet4eViFxOR0XOAxNSprnL+kN4OW1npGihT0Q4Y=";
+    hash = "sha256-nvzX0p/H3EYR8+7jD+I4FdvU+WstxR/U4Upcn7yZULk=";
   };
 
   postPatch = ''
@@ -33,14 +33,6 @@ stdenv.mkDerivation (finalAttrs: {
     patchShebangs lib/slepc/bin
   '';
 
-  # Usually this project is being built as part of a `petsc` build or as part of
-  # other projects, e.g when `petsc` is `./configure`d with
-  # `--download-slepc=1`. This instructs the slepc to be built as a standalone
-  # project.
-  preConfigure = ''
-    export SLEPC_DIR=$PWD
-  '';
-
   nativeBuildInputs = [
     python3Packages.python
   ]
@@ -99,7 +91,7 @@ stdenv.mkDerivation (finalAttrs: {
   meta = {
     description = "Scalable Library for Eigenvalue Problem Computations";
     homepage = "https://slepc.upv.es";
-    changelog = "https://gitlab.com/slepc/slepc/blob/${finalAttrs.src.tag}/CHANGELOG.md";
+    changelog = "https://gitlab.com/slepc/slepc/blob/v${finalAttrs.version}/CHANGELOG.md";
     license = with lib.licenses; [
       bsd2
     ];