diff --git a/pkgs/development/compilers/rustc/head.nix b/pkgs/development/compilers/rustc/head.nix
index 00e87f30e2cd..383632b2ce08 100644
--- a/pkgs/development/compilers/rustc/head.nix
+++ b/pkgs/development/compilers/rustc/head.nix
@@ -2,15 +2,15 @@
 callPackage ./makeRustcDerivation.nix {
   shortVersion = "1.0.0-dev";
   isRelease = false;
-  # src rev for master on 2015-04-15
-  srcRev = "a691f1eefea586f154700be6ee1b991158f82b7f";
-  srcSha = "1afypvxahhwhva9rssagm2q08wgidv6xcjrx85lqwzy6abyl1hsz";
-  snapshotHashLinux686 = "1ef82402ed16f5a6d2f87a9a62eaa83170e249ec";
-  snapshotHashLinux64 = "ef2154372e97a3cb687897d027fd51c8f2c5f349";
-  snapshotHashDarwin686 = "0310b1a970f2da7e61770fd14dbbbdca3b518234";
-  snapshotHashDarwin64 = "5f35d9c920b8083a7420ef8cf5b00d5ef3085dfa";
-  snapshotDate = "2015-03-27";
-  snapshotRev = "5520801";
+  # src rev for master on 2015-05-09
+  srcRev = "95400c51c31877ea4699adc051477edccb5cfbca";
+  srcSha = "1ldgc5nd42pcbr650rpyvpnc8h6bky6gmb116fwy1g6x2ql66djw";
+  snapshotHashLinux686 = "0bc8cffdce611fb71fd7d3d8e7cdbfaf748a4f16";
+  snapshotHashLinux64 = "94089740e48167c5975c92c139ae9c286764012f";
+  snapshotHashDarwin686 = "54cc35e76497e6e94fddf38d6e40e9d168491ddb";
+  snapshotHashDarwin64 = "43a1c1fba0d1dfee4c2ca310d506f8f5f51b3f6f";
+  snapshotDate = "2015-04-27";
+  snapshotRev = "857ef6e";
   patches = [
     ./patches/head.patch
   ] ++ stdenv.lib.optional stdenv.needsPax ./patches/grsec.patch;