diff --git a/packaging/sunshine.rb b/packaging/sunshine.rb
index 81e42b09..ecd8ff3e 100644
--- a/packaging/sunshine.rb
+++ b/packaging/sunshine.rb
@@ -65,6 +65,7 @@ class @PROJECT_NAME@ < Formula
 
     args = %W[
       -DBUILD_WERROR=ON
+      -DCMAKE_CXX_STANDARD=20
       -DCMAKE_INSTALL_PREFIX=#{prefix}
       -DHOMEBREW_ALLOW_FETCHCONTENT=ON
       -DOPENSSL_ROOT_DIR=#{Formula["openssl"].opt_prefix}