diff --git a/Gemfile.lock b/Gemfile.lock
index 68fcf16..744d436 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -45,7 +45,7 @@ GEM
       fast-stemmer (~> 1.0)
       matrix (~> 0.4)
     colorator (1.1.0)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (3.0.2)
     crass (1.0.6)
     csl (2.2.1)
@@ -322,7 +322,7 @@ CHECKSUMS
   citeproc-ruby (2.1.8) sha256=192ce6525235adaa60d1dbc3f1b10b0839e86d98a94278736b807e234b3572e9
   classifier-reborn (2.3.0) sha256=e2236322de42b9c8d45d88a951cb0d76e210afa3bb8658b7b5802e2df41ef61c
   colorator (1.1.0) sha256=e2f85daf57af47d740db2a32191d1bdfb0f6503a0dfbc8327d0c9154d5ddfc38
-  concurrent-ruby (1.3.6) sha256=6b56837e1e7e5292f9864f34b69c5a2cbc75c0cf5338f1ce9903d10fa762d5ab
+  concurrent-ruby (1.3.7) sha256=4412caec3a5ea2e5fdc52076724c071a81f2c0593d83b2ac8cbb8ca63b3151b0
   connection_pool (3.0.2) sha256=33fff5ba71a12d2aa26cb72b1db8bba2a1a01823559fb01d29eb74c286e62e0a
   crass (1.0.6) sha256=dc516022a56e7b3b156099abc81b6d2b08ea1ed12676ac7a5657617f012bd45d
   csl (2.2.1) sha256=624352f1f6f51f1e0b155bd2501ce423f03264495ec259e65c26e00872a195a2