diff --git a/ruby-sdk/Gemfile b/ruby-sdk/Gemfile
index 87778260..2583d062 100644
--- a/ruby-sdk/Gemfile
+++ b/ruby-sdk/Gemfile
@@ -12,6 +12,6 @@ end
 group :development do
   gem "rake", "~> 13.3"
   gem "rake-compiler"
-  gem "rb_sys", "~> 0.9.124"
+  gem "rb_sys", "~> 0.9.128"
   gem "rubocop", "~> 1.82"
 end
diff --git a/ruby-sdk/Gemfile.lock b/ruby-sdk/Gemfile.lock
index bfb0dca9..0184a113 100644
--- a/ruby-sdk/Gemfile.lock
+++ b/ruby-sdk/Gemfile.lock
@@ -24,9 +24,9 @@ GEM
     rake (13.3.1)
     rake-compiler (1.3.1)
       rake
-    rake-compiler-dock (1.11.0)
-    rb_sys (0.9.124)
-      rake-compiler-dock (= 1.11.0)
+    rake-compiler-dock (1.12.0)
+    rb_sys (0.9.128)
+      rake-compiler-dock (= 1.12.0)
     regexp_parser (2.11.3)
     rspec (3.13.2)
       rspec-core (~> 3.13.0)
@@ -67,7 +67,7 @@ DEPENDENCIES
   eppo-server-sdk!
   rake (~> 13.3)
   rake-compiler
-  rb_sys (~> 0.9.124)
+  rb_sys (~> 0.9.128)
   rspec (~> 3.13)
   rubocop (~> 1.82)