diff --git a/docs/0.12.1/Gemfile.lock b/docs/0.12.1/Gemfile.lock
index d0251dfa5..0afe88080 100644
--- a/docs/0.12.1/Gemfile.lock
+++ b/docs/0.12.1/Gemfile.lock
@@ -22,7 +22,7 @@ GEM
     coffee-script-source (1.12.2)
     colorator (1.1.0)
     commonmarker (0.23.10)
-    concurrent-ruby (1.3.4)
+    concurrent-ruby (1.3.7)
     connection_pool (2.4.1)
     dnsruby (1.72.2)
       simpleidn (~> 0.2.1)