diff --git a/packaging/rubygems/bin/lefthook b/packaging/rubygems/bin/lefthook
index 47647d67..7873a32c 100755
--- a/packaging/rubygems/bin/lefthook
+++ b/packaging/rubygems/bin/lefthook
@@ -6,6 +6,7 @@ platform = Gem::Platform.new(RUBY_PLATFORM)
 arch =
   case platform.cpu.sub(/\Auniversal\./, '')
   when /\Aarm64/ then "arm64" # Apple reports arm64e on M1 macs
+  when /aarch64/ then "arm64"
   when "x86_64"  then "amd64"
   when "x64"     then "amd64" # Windows with MINGW64 reports RUBY_PLATFORM as "x64-mingw32"
   else raise "Unknown architecture: #{platform.cpu}"