diff --git a/templates/sinatra_app/Gemfile.lock b/templates/sinatra_app/Gemfile.lock
index 1ff7a08..61c470b 100644
--- a/templates/sinatra_app/Gemfile.lock
+++ b/templates/sinatra_app/Gemfile.lock
@@ -14,9 +14,9 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
+    amazing_print (1.2.1)
     ansi (1.5.0)
     arel (6.0.4)
-    amazing_print (1.6.1)
     backports (3.6.8)
     builder (3.2.3)
     concurrent-ruby (1.1.5)
@@ -42,8 +42,10 @@ GEM
       ruby-progressbar
     multi_json (1.12.1)
     netrc (0.11.0)
+    nio4r (2.5.2)
     pg (0.18.4)
-    puma (3.4.0)
+    puma (5.3.1)
+      nio4r (~> 2.0)
     rack (1.6.11)
     rack-protection (1.5.5)
       rack