diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 39ae0619..31f643cd 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -122,7 +122,7 @@ GEM
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
     coderay (1.1.3)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (3.0.2)
     crass (1.0.6)
     cssbundling-rails (1.4.3)