diff --git a/Formula/portable-ruby.rb b/Formula/portable-ruby.rb
index 46f3fcd..b0c86ba 100644
--- a/Formula/portable-ruby.rb
+++ b/Formula/portable-ruby.rb
@@ -24,8 +24,8 @@ class PortableRuby < PortableFormula
   end
 
   resource "msgpack" do
-    url "https://rubygems.org/downloads/msgpack-1.7.2.gem"
-    sha256 "59ab62fd8a4d0dfbde45009f87eb6f158ab2628a7c48886b0256f175166baaa8"
+    url "https://rubygems.org/downloads/msgpack-1.7.3.gem"
+    sha256 "edb751dc3378020296365fef3197e5eeab8a7d9a571a25d046464d71b97d3012"
 
     livecheck do
       url "https://rubygems.org/api/v1/versions/msgpack.json"