diff --git a/default.nix b/default.nix
index 1f46704f..c9d2b78a 100644
--- a/default.nix
+++ b/default.nix
@@ -9,9 +9,9 @@ with pkgs;
 let
   rustcSrc = fetchgit {
     url = https://github.com/rust-lang/rust.git;
-    # master of 2019-08-18
-    rev = "ea52be482ab4945fda63cb65b6a198309a041e3c";
-    sha256 = "1spifrkvyyrh1gazqrby29fjqsdbwvajv9k9f6mk2ldrdghlsd21";
+    # master of 2019-09-25
+    rev = "37538aa1365d1f8a10770a7d15c95b3167c8db57";
+    sha256 = "1nvddkxwvrsvyx187s5mwj4fwsf26xd4vr6ba1kfy7m2fj7w79hq";
     fetchSubmodules = true;
   };
   targets = [