diff --git a/Gemfile.lock b/Gemfile.lock
index 5d34459..c08fafc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,7 +9,7 @@ GEM
     data_uri (0.1.0)
     domain_name (0.5.25)
       unf (>= 0.0.5, < 1.0.0)
-    ffi (1.9.17)
+    ffi (1.9.25)
     ffi-rzmq (2.0.4)
       ffi-rzmq-core (>= 1.0.1)
     ffi-rzmq-core (1.0.5)
@@ -22,9 +22,15 @@ GEM
       mimemagic (~> 0.3)
       multi_json (~> 1.11)
     mime-types (2.99)
-    mimemagic (0.3.2)
+    mimemagic (0.4.3)
+      nokogiri (~> 1)
+      rake
+    mini_portile2 (2.4.0)
     multi_json (1.12.1)
     netrc (0.11.0)
+    nokogiri (1.9.1)
+      mini_portile2 (~> 2.4.0)
+    rake (13.0.6)
     rest-client (1.8.0)
       http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 3.0)