diff --git a/Gemfile.lock b/Gemfile.lock
index 5e4510f..689d485 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -17,6 +17,7 @@ GEM
       xml-simple
     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 +25,18 @@ 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 (0.9.5)
+      concurrent-ruby (~> 1.0)
+    mail (2.7.1)
+      mini_mime (>= 0.1.1)
     method_source (0.8.1)
     mime (0.1)
-    mime-types (1.19)
+    mime-types (3.2.2)
+      mime-types-data (~> 3.2015)
+    mime-types-data (3.2019.0331)
+    mini_mime (1.0.1)
     multi_json (1.3.7)
     oauth (0.4.7)
-    polyglot (0.3.3)
     pry (0.9.10)
       coderay (~> 1.0.5)
       method_source (~> 0.8)
@@ -60,9 +62,6 @@ GEM
     shoulda-matchers (1.4.1)
       activesupport (>= 3.0.0)
     slop (3.3.3)
-    treetop (1.4.12)
-      polyglot
-      polyglot (>= 0.3.1)
     xml-simple (1.1.2)
 
 PLATFORMS