1 files changed, 1 insertions, 0 deletions
diff --git a/Gemfile b/Gemfile
index 5205896846..797cd1fa3a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -129,3 +129,4 @@ end
 # A gem necessary for Active Record tests with IBM DB.
 gem 'ibm_db' if ENV['IBM_DB']
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
+gem 'wdm', '>= 0.1.0', platforms: [:mingw, :mswin, :x64_mingw, :mswin64]