diff --git a/pkgs/by-name/af/afflib/package.nix b/pkgs/by-name/af/afflib/package.nix
index 2457279e6b58..2193411b6a63 100644
--- a/pkgs/by-name/af/afflib/package.nix
+++ b/pkgs/by-name/af/afflib/package.nix
@@ -13,14 +13,14 @@
 }:
 
 stdenv.mkDerivation rec {
-  version = "3.7.20";
+  version = "3.7.21";
   pname = "afflib";
 
   src = fetchFromGitHub {
     owner = "sshock";
     repo = "AFFLIBv3";
     rev = "v${version}";
-    sha256 = "sha256-xkqBfTftzn+rgeuoaKfHP7vQmy4VZuaCq8VFlfZTUE4=";
+    sha256 = "sha256-CBDkeUzHnRBkLUYl0JuQcVnQWap0l7dAca1deZVoNDM=";
   };
 
   nativeBuildInputs = [ autoreconfHook ];