diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 7ff7679577..3eabf4993c 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -242,7 +242,7 @@ GEM
     octokit (4.21.0)
       faraday (>= 0.9)
       sawyer (~> 0.8.0, >= 0.5.3)
-    parallel (1.20.1)
+    parallel (1.21.0)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.6)