diff --git a/src/ui/Gemfile.lock b/src/ui/Gemfile.lock
index c42c4a1..643aa82 100644
--- a/src/ui/Gemfile.lock
+++ b/src/ui/Gemfile.lock
@@ -42,11 +42,10 @@ GEM
     sucker_punch (2.0.4)
       concurrent-ruby (~> 1.0.0)
     temple (0.8.0)
-    thread_safe (0.3.6)
     thrift (0.9.3.0)
     tilt (2.0.8)
-    tzinfo (1.2.3)
-      thread_safe (~> 0.1)
+    tzinfo (2.0.5)
+      concurrent-ruby (~> 1.0)
     tzinfo-data (1.2017.3)
       tzinfo (>= 1.0.0)
     zipkin-tracer (0.27.1)