diff --git a/pkgs/applications/video/mkvtoolnix/default.nix b/pkgs/applications/video/mkvtoolnix/default.nix
index b902b96a7cd..442e9d8eeb3 100644
--- a/pkgs/applications/video/mkvtoolnix/default.nix
+++ b/pkgs/applications/video/mkvtoolnix/default.nix
@@ -10,13 +10,13 @@ with stdenv.lib;
 
 stdenv.mkDerivation rec {
   name = "mkvtoolnix-${version}";
-  version = "14.0.0";
+  version = "15.0.0";
 
   src = fetchFromGitHub {
     owner = "mbunkus";
     repo = "mkvtoolnix";
     rev = "release-${version}";
-    sha256 = "1ygc2qrd074vz2yw4iqml5ir31kkvkv7pz3hcfy423p9s06xi1k2";
+    sha256 = "06n0hbp484zpsjvnzp6p0nzzssym3illxdicn3y1jf8gy971rxi0";
   };
 
   nativeBuildInputs = [ pkgconfig autoconf automake gettext drake ruby docbook_xsl libxslt ];
diff --git a/pkgs/development/libraries/libebml/default.nix b/pkgs/development/libraries/libebml/default.nix
index 40d80329291..4b233301cce 100644
--- a/pkgs/development/libraries/libebml/default.nix
+++ b/pkgs/development/libraries/libebml/default.nix
@@ -1,11 +1,11 @@
 { stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
-  name = "libebml-1.3.4";
+  name = "libebml-1.3.5";
 
   src = fetchurl {
-    url = "http://dl.matroska.org/downloads/libebml/${name}.tar.bz2";
-    sha256 = "11zka6z9ncywyjr1gfm5cnii33ln7y3w6s86kiacchip2g7kw3f5";
+    url = "http://dl.matroska.org/downloads/libebml/${name}.tar.xz";
+    sha256 = "005a0ipqnfbsq47zrc61zszi439jw32q5xd6dc1jyb3lc0zl266q";
   };
 
   meta = with stdenv.lib; {