diff --git a/pkgs/by-name/au/autoprefixer/package.nix b/pkgs/by-name/au/autoprefixer/package.nix
index f3efe088f21f..3713dd359c3d 100644
--- a/pkgs/by-name/au/autoprefixer/package.nix
+++ b/pkgs/by-name/au/autoprefixer/package.nix
@@ -9,13 +9,13 @@
 }:
 stdenv.mkDerivation (finalAttrs: {
   pname = "autoprefixer";
-  version = "10.4.20";
+  version = "10.4.21";
 
   src = fetchFromGitHub {
     owner = "postcss";
     repo = "autoprefixer";
     rev = finalAttrs.version;
-    hash = "sha256-CGAUv6qzpcjDPcW7Vsak0iYC6GOJAkKLciVnxYcOeus=";
+    hash = "sha256-25FVNUXMEuzPJtpld/GHEppspa2ns7fAuniBCltSync=";
   };
 
   nativeBuildInputs = [
@@ -25,7 +25,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   pnpmDeps = pnpm_9.fetchDeps {
     inherit (finalAttrs) pname version src;
-    hash = "sha256-Gu2DRDx0YRlSb+EInOfmAOYKvOba6Lq1wkOW9t9fnbA=";
+    hash = "sha256-zb/BwL//i0oly5HEXN20E3RzZXdaOn+G2yIWRas3PB4=";
   };
 
   installPhase = ''