diff --git a/Gemfile.lock b/Gemfile.lock
index 5e4510f..ea60fd0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,15 +8,20 @@ PATH
 GEM
   remote: http://rubygems.org/
   specs:
-    activesupport (3.2.9)
-      i18n (~> 0.6)
-      multi_json (~> 1.0)
+    activesupport (5.2.3)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
     aws-s3 (0.6.3)
       builder
       mime-types
       xml-simple
+    bourne (1.1.2)
+      mocha (= 0.10.5)
     builder (3.1.4)
     coderay (1.0.8)
+    concurrent-ruby (1.1.5)
     diff-lcs (1.3)
     gmail (0.4.0)
       gmail_xoauth (>= 0.3.0)
@@ -24,17 +29,21 @@ GEM
       mime (>= 0.1)
     gmail_xoauth (0.4.1)
       oauth (>= 0.3.6)
-    i18n (0.6.1)
-    mail (2.5.2)
-      i18n (>= 0.4.0)
-      mime-types (~> 1.16)
-      treetop (~> 1.4.8)
+    i18n (1.6.0)
+      concurrent-ruby (~> 1.0)
+    mail (2.7.1)
+      mini_mime (>= 0.1.1)
+    metaclass (0.0.4)
     method_source (0.8.1)
     mime (0.1)
-    mime-types (1.19)
-    multi_json (1.3.7)
+    mime-types (3.2.2)
+      mime-types-data (~> 3.2015)
+    mime-types-data (3.2019.0331)
+    mini_mime (1.0.1)
+    minitest (5.11.3)
+    mocha (0.10.5)
+      metaclass (~> 0.0.1)
     oauth (0.4.7)
-    polyglot (0.3.3)
     pry (0.9.10)
       coderay (~> 1.0.5)
       method_source (~> 0.8)
@@ -57,12 +66,13 @@ GEM
       shoulda-context (~> 1.0.1)
       shoulda-matchers (~> 1.4.1)
     shoulda-context (1.0.1)
-    shoulda-matchers (1.4.1)
+    shoulda-matchers (1.4.2)
       activesupport (>= 3.0.0)
+      bourne (~> 1.1.2)
     slop (3.3.3)
-    treetop (1.4.12)
-      polyglot
-      polyglot (>= 0.3.1)
+    thread_safe (0.3.6)
+    tzinfo (1.2.5)
+      thread_safe (~> 0.1)
     xml-simple (1.1.2)
 
 PLATFORMS