diff --git a/pkgs/development/libraries/ffmpeg-full/default.nix b/pkgs/development/libraries/ffmpeg-full/default.nix
index 45a4f48fd33..78d291e86fa 100644
--- a/pkgs/development/libraries/ffmpeg-full/default.nix
+++ b/pkgs/development/libraries/ffmpeg-full/default.nix
@@ -238,11 +238,11 @@ assert opensslExtlib -> gnutls == null && openssl != null && nonfreeLicensing;
 
 stdenv.mkDerivation rec {
   pname = "ffmpeg-full";
-  version = "4.2";
+  version = "4.2.1";
 
   src = fetchurl {
     url = "https://www.ffmpeg.org/releases/ffmpeg-${version}.tar.xz";
-    sha256 = "1mgcxm7sqkajx35px05szsmn9mawwm03cfpmk3br7bcp3a1i0gq2";
+    sha256 = "1m5nkc61ihgcf0b2wabm0zyqa8sj3c0w8fi6kr879lb0kdzciiyf";
   };
 
   patches = [ ./prefer-libdav1d-over-libaom.patch ];
diff --git a/pkgs/development/libraries/ffmpeg/4.nix b/pkgs/development/libraries/ffmpeg/4.nix
index 670f51000a6..a0b95cecaab 100644
--- a/pkgs/development/libraries/ffmpeg/4.nix
+++ b/pkgs/development/libraries/ffmpeg/4.nix
@@ -5,8 +5,8 @@
 }@args:
 
 callPackage ./generic.nix (args // rec {
-  version = branch;
+  version = "4.2.1";
   branch = "4.2";
-  sha256 = "1f3glany3p2j832a9wia5vj8ds9xpm0xxlyia91y17hy85gxwsrh";
+  sha256 = "090naa6rj46pzkgh03bf51hbqdz356qqckr2pw6pykc6ysiryak8";
   darwinFrameworks = [ Cocoa CoreMedia VideoToolbox ];
 })