diff --git a/Gemfile.lock b/Gemfile.lock
index b9a5eaa..fda6c78 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -107,7 +107,8 @@ GEM
       rack
       rake (>= 0.8.1)
     public_suffix (4.0.3)
-    puma (3.12.2)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.2.1)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -203,7 +204,6 @@ DEPENDENCIES
   selenium-webdriver
   sqlite3
   turbolinks (~> 5)
-  tzinfo-data
   uglifier (>= 1.3.0)
   web-console (>= 3.3.0)