diff --git a/pkgs/development/tools/analysis/checkstyle/default.nix b/pkgs/development/tools/analysis/checkstyle/default.nix
index 90dab874e18..1904ccc20bb 100644
--- a/pkgs/development/tools/analysis/checkstyle/default.nix
+++ b/pkgs/development/tools/analysis/checkstyle/default.nix
@@ -1,12 +1,12 @@
 { stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
-  version = "6.3";
+  version = "6.4";
   name = "checkstyle-${version}";
 
   src = fetchurl {
     url = "mirror://sourceforge/checkstyle/${version}/${name}-bin.tar.gz";
-    sha256 = "181wm6yxyf9dsp1dgy7bpjz5j72a5fc818293k5mxr8g1gf0s3f4";
+    sha256 = "0qk653i8973ygz630siava3fm54vxmahbw6rikdi9lzjlpvvn74f";
   };
 
   installPhase = ''