diff --git a/Gemfile b/Gemfile
index 978f0a8..fe2c41b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ group :test do
   gem "sinatra", "~> 1.4"
   gem "rspec",   "~> 3.0"
   gem "webmock", "~> 3.7"
-  gem "rspec-mocks", "3.9.0"
+  gem "rspec-mocks", "3.12.6"
   gem "simplecov", "~> 0.18.5" # Pin until we drop ruby support 2.4
   gem "simplecov-console"
   gem "rake"