diff --git a/Gemfile.lock b/Gemfile.lock
index 1bd74c35..a3bc6c59 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -56,7 +56,7 @@ GEM
       citeproc (~> 1.0, >= 1.0.9)
       csl (~> 2.0)
       observer (< 1.0)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (2.5.5)
     crack (1.0.1)
       bigdecimal