diff --git a/Gemfile b/Gemfile
index 6529e988..f85c2afc 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,6 +9,7 @@ gem "rake", "~> 13.0"
 group :release do
   gem "git", "~> 1.8"
   gem "semver2", "~> 3.4"
+  gem "yard", "~> 0.9.26"
 end
 
 group :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index ee330272..28180ec4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -159,6 +159,7 @@ DEPENDENCIES
   simplecov (~> 0.21.2)
   simplecov-console (~> 0.9.1)
   solargraph (~> 0.40.4)
+  yard (~> 0.9.26)
 
 BUNDLED WITH
    2.2.15