diff --git a/Gemfile.lock b/Gemfile.lock
index 1b80be7..a0a741f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -248,7 +248,9 @@ GEM
     mime-types (3.2.2)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.0331)
-    mimemagic (0.3.3)
+    mimemagic (0.4.3)
+      nokogiri (~> 1)
+      rake
     mini_magick (4.9.4)
     mini_mime (1.0.1)
     mini_portile2 (2.4.0)
@@ -262,6 +264,7 @@ GEM
     multi_xml (0.6.0)
     multipart-post (2.1.0)
     nenv (0.3.0)
+    nio4r (2.5.2)
     nokogiri (1.10.7)
       mini_portile2 (~> 2.4.0)
     notiffany (0.1.1)
@@ -293,7 +296,8 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (3.0.3)
-    puma (3.12.2)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     rack (1.6.12)
     rack-test (0.6.3)
       rack (>= 1.0)