diff --git a/pkgs/development/python-modules/lark-parser/default.nix b/pkgs/development/python-modules/lark-parser/default.nix
index b81cc132a2d..a1b58a4eb05 100644
--- a/pkgs/development/python-modules/lark-parser/default.nix
+++ b/pkgs/development/python-modules/lark-parser/default.nix
@@ -6,13 +6,13 @@
 
 buildPythonPackage rec {
   pname = "lark-parser"; # PyPI name
-  version = "2017-12-10";
+  version = "2017-12-18";
 
   src = fetchFromGitHub {
     owner = "erezsh";
     repo = "lark";
-    rev = "852607b978584ecdec68ac115dd8554cdb0a2305";
-    sha256 = "1clzmvbp1b4zamcm6ldak0hkw46n3lhw4b28qq9xdl0n4va6zig7";
+    rev = "9d6cde9b1ba971f02ea8106fa3b71a934e83d6fa";
+    sha256 = "0nv6nxd8wx9dwhn37m94fkc10gknckrjs1hzajxygla3dpql455j";
   };
 
   checkPhase = ''