diff --git a/Gemfile.lock b/Gemfile.lock
index 3f0ce7b..5480150 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -49,7 +49,7 @@ GEM
     concurrent-ruby (1.1.5)
     crass (1.0.4)
     erubi (1.8.0)
-    ffi (1.11.0)
+    ffi (1.15.5)
     globalid (0.4.2)
       activesupport (>= 4.2.0)
     i18n (1.6.0)
@@ -65,7 +65,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.1)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
@@ -140,7 +142,7 @@ GEM
       concurrent-ruby (~> 1.0)
     thor (0.20.3)
     thread_safe (0.3.6)
-    tzinfo (1.2.5)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     websocket-driver (0.7.0)
       websocket-extensions (>= 0.1.0)