diff --git a/pkgs/by-name/mu/mumps/package.nix b/pkgs/by-name/mu/mumps/package.nix
index a02d7901617e..17c005946f57 100644
--- a/pkgs/by-name/mu/mumps/package.nix
+++ b/pkgs/by-name/mu/mumps/package.nix
@@ -49,7 +49,7 @@ stdenv.mkDerivation (finalAttrs: {
     ]
     ++ [
       "LSCOTCHDIR=${scotch}/lib"
-      "ISCOTCH=-I${scotch}/include"
+      "ISCOTCH=-I${scotch.dev}/include"
       "LMETISDIR=${metis}/lib"
       "IMETIS=-I${metis}/include"
       "allshared"
diff --git a/pkgs/by-name/sc/scotch/package.nix b/pkgs/by-name/sc/scotch/package.nix
index 8455b4d22648..e089a0666072 100644
--- a/pkgs/by-name/sc/scotch/package.nix
+++ b/pkgs/by-name/sc/scotch/package.nix
@@ -14,16 +14,24 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "scotch";
-  version = "7.0.4";
+  version = "7.0.5";
 
   src = fetchFromGitLab {
     domain = "gitlab.inria.fr";
     owner = "scotch";
     repo = "scotch";
     rev = "v${finalAttrs.version}";
-    hash = "sha256-uaox4Q9pTF1r2BZjvnU2LE6XkZw3x9mGSKLdRVUobGU=";
+    hash = "sha256-XXkVwTr8cbYfzXWWkPERTmjfE86JHUUuU6yxjp9k6II=";
   };
 
+  outputs = [
+    "bin"
+    "dev"
+    "out"
+  ];
+
+  cmakeFlags = [ "-DBUILD_SHARED_LIBS=ON" ];
+
   nativeBuildInputs = [
     cmake
     gfortran