diff --git a/pkgs/development/tools/icestorm/default.nix b/pkgs/development/tools/icestorm/default.nix
index 2bac15403038..adcacde14cf1 100644
--- a/pkgs/development/tools/icestorm/default.nix
+++ b/pkgs/development/tools/icestorm/default.nix
@@ -11,7 +11,7 @@
 
 stdenv.mkDerivation rec {
   pname = "icestorm";
-  version = "2019.08.15";
+  version = "2019.08.31";
 
   pythonPkg = if usePyPy then pypy3 else python3;
   pythonInterp = pythonPkg.interpreter;
@@ -19,8 +19,8 @@ stdenv.mkDerivation rec {
   src = fetchFromGitHub {
     owner  = "cliffordwolf";
     repo   = "icestorm";
-    rev    = "95949315364f8d9b0c693386aefadf44b28e2cf6";
-    sha256 = "05q1vxlf9l5z9mam8jbv58jqj7nsd8v7ssy753sharpgzzgdc8a2";
+    rev    = "04f1eb78ed8fd50516aee50102675041a8fd40cd";
+    sha256 = "10jdiw4mw0afcjq7xl3xs8z733mlrx927x620vs2yz91p757jxbd";
   };
 
   nativeBuildInputs = [ pkgconfig ];