diff --git a/pkgs/development/libraries/gmp/default.nix b/pkgs/development/libraries/gmp/default.nix
index 364cb73bbb7..b8d915d1fac 100644
--- a/pkgs/development/libraries/gmp/default.nix
+++ b/pkgs/development/libraries/gmp/default.nix
@@ -1,11 +1,20 @@
 {stdenv, fetchurl, m4}:
 
 stdenv.mkDerivation {
-  name = "gmp-4.2.1";
+  name = "gmp-4.2.2";
+
   src = fetchurl {
-    url = mirror://gnu/gmp/gmp-4.2.1.tar.bz2;
-    md5 = "091c56e0e1cca6b09b17b69d47ef18e3";
+    url = mirror://gnu/gmp/gmp-4.2.2.tar.bz2;
+    sha256 = "0yv593sk62ypn21gg2x570g955lmsi4i6f2bc3s43p52myn0lb1b";
   };
+
   buildInputs = [m4];
+
   doCheck = true;
+
+  meta = {
+    description = "A free library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating point numbers";
+    homepage = http://gmplib.org/;
+    license = "LGPL";
+  };
 }