diff --git a/Gemfile b/Gemfile
index 1a1ed1b269..abcb824ddb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem "rake-compiler"
 gem "ruby_parser"
 gem "test-unit"
 
-platforms :mri, :mswin, :mingw, :x64_mingw do
+platforms :mri, :windows do
   gem "ffi"
   gem "irb"
   gem "ruby_memcheck"
diff --git a/Gemfile.lock b/Gemfile.lock
index be87f10dc9..f3c5fc0e42 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -81,4 +81,4 @@ DEPENDENCIES
   test-unit
 
 BUNDLED WITH
-   2.5.16
+  4.0.4