diff --git a/package.json b/package.json
index a002fff82b44..2d2c3be91476 100644
--- a/package.json
+++ b/package.json
@@ -95,6 +95,7 @@
     "@percy/cypress": "^3.1.0",
     "@semantic-release/changelog": "5.0.1",
     "@semantic-release/git": "9.0.0",
+    "@toycode/markdown-it-class": "^1.0.0",
     "@types/bluebird": "3.5.29",
     "@types/chai-enzyme": "0.6.7",
     "@types/classnames": "2.2.9",
diff --git a/yarn.lock b/yarn.lock
index ed3d22a7fae6..8dc699914e81 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -8313,7 +8313,7 @@
   resolved "https://registry.yarnpkg.com/@tootallnate/once/-/once-1.1.2.tgz#ccb91445360179a04e7fe6aff78c00ffc1eeaf82"
   integrity sha512-RbzJvlNzmRq5c3O09UipeuXno4tA1FE6ikOjxZK0tuxVv3412l64l5t1W5pj4+rJq9vpkm/kwiR07aZXnsKPxw==
 
-"@toycode/markdown-it-class@1.2.4":
+"@toycode/markdown-it-class@1.2.4", "@toycode/markdown-it-class@^1.0.0":
   version "1.2.4"
   resolved "https://registry.yarnpkg.com/@toycode/markdown-it-class/-/markdown-it-class-1.2.4.tgz#6d9bc162d0b980695a2e6b2622f49eb1c3f349c8"
   integrity sha512-hA4gHBK8moObkOYdWTjhy1wYcYy0MJeM3JjSKbsXHRpRMvIKhk6Jm+t3bXsSScTdz/byWqQbs8YIwVYjHp+SlQ==