diff --git a/Gemfile.lock b/Gemfile.lock
index 2f7cbe7..a9f274c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -179,7 +179,7 @@ GEM
     term-ansicolor (1.3.0)
       tins (~> 1.0)
     thor (0.19.1)
-    thread_safe (0.3.3)
+    thread_safe (0.3.4)
     tilt (1.4.1)
     tins (1.3.0)
     treetop (1.4.15)