diff --git a/pkgs/development/compilers/mono/5.nix b/pkgs/development/compilers/mono/5.nix
index 2b987b08364c..0db13308a5af 100644
--- a/pkgs/development/compilers/mono/5.nix
+++ b/pkgs/development/compilers/mono/5.nix
@@ -2,7 +2,7 @@
 
 callPackage ./generic.nix (rec {
   inherit Foundation libobjc;
-  version = "5.16.0.220";
-  sha256 = "1qwdmxssplfdb5rq86f1j8lskvr9dfk5c8hqz9ic09ml69r8c87l";
-  enableParallelBuilding = false;
+  version = "5.20.1.27";
+  sha256 = "15rpwxw642ad1na93k5nj7d2lb24f21kncr924gxr00178a9x0jy";
+  enableParallelBuilding = true;
 })