diff --git a/Gemfile.lock b/Gemfile.lock
index c1f316b..7b34ba7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -253,7 +253,9 @@ GEM
     mime-types (3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
-    mimemagic (0.3.2)
+    mimemagic (0.4.3)
+      nokogiri (~> 1)
+      rake
     mini_magick (4.5.1)
     mini_portile2 (2.4.0)
     minitest (5.14.0)
@@ -284,7 +286,8 @@ GEM
       ast (~> 2.2)
     pg (0.21.0)
     powerpack (0.1.1)
-    puma (3.9.1)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.2.2)
     rack-test (0.6.3)
       rack (>= 1.0)