diff --git a/pkgs/development/php-packages/protobuf/default.nix b/pkgs/development/php-packages/protobuf/default.nix
index b24a8f025e50..692fdac22684 100644
--- a/pkgs/development/php-packages/protobuf/default.nix
+++ b/pkgs/development/php-packages/protobuf/default.nix
@@ -3,8 +3,8 @@
 buildPecl {
   pname = "protobuf";
 
-  version = "3.19.4";
-  sha256 = "sha256-ijo+UZz+Hh3F8FUJmcUIbKBLkv4t4CWIrbRUfUp7Zbo=";
+  version = "3.21.4";
+  sha256 = "sha256-vhfoUu63KhndfQTiITtTnaqFVF9OWMCaLf/9PUioKkQ=";
 
   buildInputs = [ pcre2 ];