diff --git a/pkgs/development/libraries/dlib/default.nix b/pkgs/development/libraries/dlib/default.nix
index a7d68d62f2a..3f59368c278 100644
--- a/pkgs/development/libraries/dlib/default.nix
+++ b/pkgs/development/libraries/dlib/default.nix
@@ -8,13 +8,13 @@
 
 stdenv.mkDerivation rec {
   pname = "dlib";
-  version = "19.20";
+  version = "19.21";
 
   src = fetchFromGitHub {
     owner = "davisking";
     repo = "dlib";
     rev ="v${version}";
-    sha256 = "10b5hrprlls0nhljx18ys8cms7bgqirvhxlx6gbvbprbi6q16f9r";
+    sha256 = "00jwklnl21l3hlvb0bjc6rl3hgi88vxb41dsn4m0kh436c9v0rl3";
   };
 
   postPatch = ''