diff --git a/pkgs/development/compilers/zig/default.nix b/pkgs/development/compilers/zig/default.nix
index 35ad09320dec..961e28da82e7 100644
--- a/pkgs/development/compilers/zig/default.nix
+++ b/pkgs/development/compilers/zig/default.nix
@@ -1,19 +1,23 @@
 { stdenv, fetchFromGitHub, cmake, llvmPackages, libxml2, zlib }:
 
 stdenv.mkDerivation rec {
-  version = "0.4.0";
+  version = "0.5.0";
   pname = "zig";
 
   src = fetchFromGitHub {
     owner = "ziglang";
     repo = pname;
     rev = version;
-    sha256 = "1cq6cc5pvybz9kn3y0j5gskkjq88hkmmcsva54mfzpcc65l3pv6p";
+    sha256 = "0xyl0riakh6kwb3yvxihb451kqs4ai4q0aygqygnlb2rlr1dn1zb";
   };
 
   nativeBuildInputs = [ cmake ];
   buildInputs = [ llvmPackages.clang-unwrapped llvmPackages.llvm libxml2 zlib ];
 
+  preBuild = ''
+    export HOME=$TMPDIR;
+  '';
+
   meta = with stdenv.lib; {
     description = "Programming languaged designed for robustness, optimality, and clarity";
     homepage = https://ziglang.org/;
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 243883874fc3..bd50b042028e 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -14275,7 +14275,7 @@ in
   zmqpp = callPackage ../development/libraries/zmqpp { };
 
   zig = callPackage ../development/compilers/zig {
-    llvmPackages = llvmPackages_8;
+    llvmPackages = llvmPackages_9;
   };
 
   zimlib = callPackage ../development/libraries/zimlib { };