diff --git a/pkgs/applications/science/electronics/verilator/default.nix b/pkgs/applications/science/electronics/verilator/default.nix
index 5c1cd75fd569..3c01f8f37498 100644
--- a/pkgs/applications/science/electronics/verilator/default.nix
+++ b/pkgs/applications/science/electronics/verilator/default.nix
@@ -1,16 +1,16 @@
-{ stdenv, fetchurl, perl, flex, bison }:
+{ stdenv, fetchurl, perl, flex_2_6_1, bison }:
 
 stdenv.mkDerivation rec {
   name    = "verilator-${version}";
-  version = "3.884";
+  version = "3.900";
 
   src = fetchurl {
     url    = "http://www.veripool.org/ftp/${name}.tgz";
-    sha256 = "1j159dg7m2ych5lwglb1qq1fgqh3kwhaa1r3jx84qdisg0icln2y";
+    sha256 = "0yvbibcysdiw6mphda0lfs56wz6v450px2420x0hbd3rc7k53s2b";
   };
 
   enableParallelBuilding = true;
-  buildInputs = [ perl flex bison ];
+  buildInputs = [ perl flex_2_6_1 bison ];
 
   meta = {
     description = "Fast and robust (System)Verilog simulator/compiler";