diff --git a/pkgs/tools/graphics/lepton/default.nix b/pkgs/tools/graphics/lepton/default.nix
index 2a4f8a310ada5f..a65e57d9a73137 100644
--- a/pkgs/tools/graphics/lepton/default.nix
+++ b/pkgs/tools/graphics/lepton/default.nix
@@ -1,14 +1,14 @@
 { stdenv, fetchFromGitHub, cmake, git, glibc }:
 
 stdenv.mkDerivation rec {
-  version = "1.2.1";
-  pname = "lepton";
+  version = "2019-08-20";
+  pname = "lepton-unstable";
 
   src = fetchFromGitHub {
     repo = "lepton";
     owner = "dropbox";
-    rev = version;
-    sha256 = "1f2vyp0crj4yw27bs53vykf2fqk4w57gv3lh9dp89dh3y7wwh1ba";
+    rev = "3d1bc19da9f13a6e817938afd0f61a81110be4da";
+    sha256 = "0aqs6nvcbq8cbfv8699fa634bsz7csmk0169n069yvv17d1c07fd";
   };
 
   nativeBuildInputs = [ cmake git ];