diff --git a/pkgs/applications/video/mkvtoolnix/default.nix b/pkgs/applications/video/mkvtoolnix/default.nix
index 39d2f1e21ce..d26acfd7c0b 100644
--- a/pkgs/applications/video/mkvtoolnix/default.nix
+++ b/pkgs/applications/video/mkvtoolnix/default.nix
@@ -13,13 +13,13 @@ with lib;
 
 stdenv.mkDerivation rec {
   pname = "mkvtoolnix";
-  version = "53.0.0";
+  version = "55.0.0";
 
   src = fetchFromGitLab {
     owner  = "mbunkus";
     repo   = "mkvtoolnix";
     rev    = "release-${version}";
-    sha256 = "04wjs3sgb3gn85gl8y1svx177d1213hswx37zdsj80giw1k5df79";
+    sha256 = "129azp4cpdd05f6072gkxdjj811aqs29nbw6v6qm8vv47gfvjcf7";
   };
 
   nativeBuildInputs = [
@@ -51,6 +51,7 @@ stdenv.mkDerivation rec {
   ];
 
   CXXFLAGS = optional stdenv.cc.isClang "-std=c++17";
+  LDFLAGS = optional stdenv.cc.isClang "-lc++fs";
 
   dontWrapQtApps = true;
   postFixup = optionalString withGUI ''
@@ -60,7 +61,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     description = "Cross-platform tools for Matroska";
     homepage    = "http://www.bunkus.org/videotools/mkvtoolnix/";
-    license     = licenses.gpl2;
+    license     = licenses.gpl2Only;
     maintainers = with maintainers; [ codyopel rnhmjoj ];
     platforms   = platforms.linux
       ++ optionals (!withGUI) platforms.darwin;
diff --git a/pkgs/development/libraries/libebml/default.nix b/pkgs/development/libraries/libebml/default.nix
index e7a877962cc..6a042012132 100644
--- a/pkgs/development/libraries/libebml/default.nix
+++ b/pkgs/development/libraries/libebml/default.nix
@@ -2,19 +2,20 @@
 
 stdenv.mkDerivation rec {
   pname = "libebml";
-  version = "1.4.1";
+  version = "1.4.2";
 
   src = fetchFromGitHub {
     owner  = "Matroska-Org";
     repo   = "libebml";
     rev    = "release-${version}";
-    sha256 = "04bn1i7g4vwmkv3hv26rmcb59zkl2rh37qnfjm52j560bjlyd7im";
+    sha256 = "1hiilnabar826lfxsaflqjhgsdli6hzzhjv8q2nmw36fvvlyks25";
   };
 
   nativeBuildInputs = [ cmake pkg-config ];
 
   cmakeFlags = [
     "-DBUILD_SHARED_LIBS=YES"
+    "-DCMAKE_INSTALL_PREFIX="
   ];
 
   meta = with lib; {
diff --git a/pkgs/development/libraries/libmatroska/default.nix b/pkgs/development/libraries/libmatroska/default.nix
index 1d3cf4032dd..a89bf9fc4ab 100644
--- a/pkgs/development/libraries/libmatroska/default.nix
+++ b/pkgs/development/libraries/libmatroska/default.nix
@@ -3,13 +3,13 @@
 
 stdenv.mkDerivation rec {
   pname = "libmatroska";
-  version = "1.6.2";
+  version = "1.6.3";
 
   src = fetchFromGitHub {
     owner  = "Matroska-Org";
     repo   = "libmatroska";
     rev    = "release-${version}";
-    sha256 = "0yhr9hhgljva1fx3b0r4s3wkkypdfgsysbl35a4g3krkbhaa9rsd";
+    sha256 = "01dg12ndxfdqgjx5v2qy4mff6xjdxglywyg82sr3if5aw6rp3dji";
   };
 
   nativeBuildInputs = [ cmake pkg-config ];
@@ -18,6 +18,7 @@ stdenv.mkDerivation rec {
 
   cmakeFlags = [
     "-DBUILD_SHARED_LIBS=YES"
+    "-DCMAKE_INSTALL_PREFIX="
   ];
 
   meta = with lib; {