diff --git a/pkgs/development/libraries/vapoursynth/default.nix b/pkgs/development/libraries/vapoursynth/default.nix
index 46c97e0dae97b..043bfb007a3d6 100644
--- a/pkgs/development/libraries/vapoursynth/default.nix
+++ b/pkgs/development/libraries/vapoursynth/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchFromGitHub, pkgconfig, autoreconfHook, makeWrapper
 , zimg, libass, python3, libiconv
-, ApplicationServices, nasm
+, ApplicationServices
 , ocrSupport ?  false, tesseract ? null
 , imwriSupport? true,  imagemagick7 ? null
 }:
@@ -12,16 +12,16 @@ with stdenv.lib;
 
 stdenv.mkDerivation rec {
   pname = "vapoursynth";
-  version = "R48";
+  version = "R49";
 
   src = fetchFromGitHub {
     owner  = "vapoursynth";
     repo   = "vapoursynth";
     rev    = version;
-    sha256 = "1i6163bidlp0p9zcnxpsphr44ayfzd51fig4ri7vbrbl9lw9jaih";
+    sha256 = "1d298mlb24nlc2x7pixfbkd0qbpv4c706c32idsgpi96z1spkhvl";
   };
 
-  nativeBuildInputs = [ pkgconfig autoreconfHook nasm makeWrapper ];
+  nativeBuildInputs = [ pkgconfig autoreconfHook makeWrapper ];
   buildInputs = [
     zimg libass
     (python3.withPackages (ps: with ps; [ sphinx cython ]))