diff --git a/Gemfile.lock b/Gemfile.lock
index 080caa2..9c00298 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,18 +1,19 @@
 GIT
-  remote: git://github.com/fgrehm/letter_opener_web.git
-  revision: ab50ad09a2af5350bdca9c079bba73523e64f4cd
+  remote: https://github.com/fgrehm/letter_opener_web.git
+  revision: 026d5e0594221143126b9118222aa458eb8f4e3c
   specs:
-    letter_opener_web (1.3.3)
-      actionmailer (>= 3.2)
-      letter_opener (~> 1.0)
-      railties (>= 3.2)
+    letter_opener_web (2.0.0)
+      actionmailer (>= 5.2)
+      letter_opener (~> 1.7)
+      railties (>= 5.2)
+      rexml
 
 GIT
-  remote: git://github.com/thoughtbot/shoulda-matchers.git
-  revision: 7f070cbab458d4a1a00e9566611f5a94f7704464
+  remote: https://github.com/thoughtbot/shoulda-matchers.git
+  revision: 3e9d69ba7b6cc37251deb08f1a8866c97cf2bc0c
   specs:
-    shoulda-matchers (3.1.2)
-      activesupport (>= 4.2.0)
+    shoulda-matchers (5.0.0)
+      activesupport (>= 5.2.0)
 
 GEM
   remote: https://rubygems.org/
@@ -102,7 +103,7 @@ GEM
     coderay (1.1.2)
     coercible (1.0.0)
       descendants_tracker (~> 0.0.1)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.10)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
     crass (1.0.4)
@@ -139,8 +140,8 @@ GEM
     foreman (0.85.0)
       thor (~> 0.19.1)
     gli (2.17.2)
-    globalid (0.4.1)
-      activesupport (>= 4.2.0)
+    globalid (1.0.1)
+      activesupport (>= 5.0)
     google-protobuf (3.6.1)
     googleapis-common-protos-types (1.0.2)
       google-protobuf (~> 3.0)
@@ -151,7 +152,7 @@ GEM
     hashie (3.6.0)
     hitimes (1.3.0)
     htmlentities (4.3.4)
-    i18n (1.1.0)
+    i18n (1.12.0)
       concurrent-ruby (~> 1.0)
     ice_nine (0.11.2)
     inflecto (0.0.2)
@@ -159,8 +160,8 @@ GEM
     json (2.1.0)
     launchy (2.4.3)
       addressable (~> 2.3)
-    letter_opener (1.6.0)
-      launchy (~> 2.2)
+    letter_opener (1.8.1)
+      launchy (>= 2.2, < 3)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -173,10 +174,12 @@ GEM
     marcel (0.3.2)
       mimemagic (~> 0.3.2)
     method_source (0.9.0)
-    mimemagic (0.3.2)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.1)
     mini_portile2 (2.3.0)
-    minitest (5.11.3)
+    minitest (5.17.0)
     multipart-post (2.0.0)
     nio4r (2.3.1)
     nokogiri (1.8.4)
@@ -232,6 +235,7 @@ GEM
     responders (2.4.0)
       actionpack (>= 4.2.0, < 5.3)
       railties (>= 4.2.0, < 5.3)
+    rexml (3.2.5)
     rspec-core (3.8.0)
       rspec-support (~> 3.8.0)
     rspec-expectations (3.8.1)
@@ -292,7 +296,7 @@ GEM
     thread_safe (0.3.6)
     timers (4.1.2)
       hitimes
-    tzinfo (1.2.5)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     unicode-display_width (1.4.0)
     vcr (4.0.0)