diff --git a/pkgs/development/compilers/gcc/4.9/default.nix b/pkgs/development/compilers/gcc/4.9/default.nix
index f00c42e421ad..ab7732a68eb2 100644
--- a/pkgs/development/compilers/gcc/4.9/default.nix
+++ b/pkgs/development/compilers/gcc/4.9/default.nix
@@ -52,7 +52,7 @@ assert langGo -> langCC;
 with stdenv.lib;
 with builtins;
 
-let version = "4.9.0";
+let version = "4.9.1";
 
     # Whether building a cross-compiler for GNU/Hurd.
     crossGNU = cross != null && cross.config == "i586-pc-gnu";
@@ -209,7 +209,7 @@ stdenv.mkDerivation ({
 
   src = fetchurl {
     url = "mirror://gnu/gcc/gcc-${version}/gcc-${version}.tar.bz2";
-    sha256 = "0mqjxpw2klskls00lwx1k24pnyzm3whqxg3hk74c3sddgfllgc5r";
+    sha256 = "0zki3ngi0gsidnmsp88mjl2868cc7cm5wm1vwqw6znja28d7hd6k";
   };
 
   inherit patches;