diff --git a/pkgs/development/compilers/mono/5.0.nix b/pkgs/development/compilers/mono/5.0.nix
index e51bbc0c308..911ba0ae02a 100644
--- a/pkgs/development/compilers/mono/5.0.nix
+++ b/pkgs/development/compilers/mono/5.0.nix
@@ -2,6 +2,6 @@
 
 callPackage ./generic-cmake.nix (rec {
   inherit Foundation libobjc;
-  version = "5.0.0.48";
-  sha256 = "13n20wmijkhd7vm41lzz1n774rna67d94prl33bz1lly0idsciq0";
+  version = "5.0.1.1";
+  sha256 = "064pgsmanpybpbhpam9jv9n8aicx6mlyb7a91yzh3kcksmqsxmj8";
 })
diff --git a/pkgs/development/compilers/mono/generic-cmake.nix b/pkgs/development/compilers/mono/generic-cmake.nix
index ab232f07d1b..f6e3f5a0100 100644
--- a/pkgs/development/compilers/mono/generic-cmake.nix
+++ b/pkgs/development/compilers/mono/generic-cmake.nix
@@ -37,7 +37,7 @@ stdenv.mkDerivation rec {
   ];
 
   configurePhase = ''
-    substituteInPlace ./autogen.sh --replace "/usr/bin/env sh" "${stdenv.shell}"
+    patchShebangs ./
     ./autogen.sh --prefix $out
   '';
 
@@ -56,7 +56,6 @@ stdenv.mkDerivation rec {
   # LLVM path to point into the Mono LLVM build, since it's private anyway.
   preBuild = ''
     makeFlagsArray=(INSTALL=`type -tp install`)
-    patchShebangs ./
     substituteInPlace mcs/class/corlib/System/Environment.cs --replace /usr/share "$out/share"
   '' + stdenv.lib.optionalString withLLVM ''
     substituteInPlace mono/mini/aot-compiler.c --replace "llvm_path = g_strdup (\"\")" "llvm_path = g_strdup (\"${llvm}/bin/\")"