diff --git a/Gemfile b/Gemfile
index cf1e64b74..07a787448 100644
--- a/Gemfile
+++ b/Gemfile
@@ -68,7 +68,7 @@ group :development, :test do
   gem 'i18n-tasks', '~> 0.9.25'
   gem 'knapsack_pro', '~> 0.53.0'
   gem 'launchy', '~> 2.4.3'
-  gem 'letter_opener_web', '~> 1.3.2'
+  gem 'letter_opener_web', '~> 1.3.4'
   gem 'quiet_assets', '~> 1.1.0'
   gem 'spring', '~> 2.0.1'
   gem 'spring-commands-rspec', '~> 1.0.4'
diff --git a/Gemfile.lock b/Gemfile.lock
index db64804eb..0c72b20b1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -240,7 +240,7 @@ GEM
       addressable (~> 2.3)
     letter_opener (1.6.0)
       launchy (~> 2.2)
-    letter_opener_web (1.3.2)
+    letter_opener_web (1.3.4)
       actionmailer (>= 3.2)
       letter_opener (~> 1.0)
       railties (>= 3.2)
@@ -257,7 +257,7 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
     mimemagic (0.3.2)
-    mini_mime (1.0.0)
+    mini_mime (1.0.1)
     mini_portile2 (2.3.0)
     minitest (5.11.3)
     mixlib-cli (1.7.0)
@@ -317,7 +317,7 @@ GEM
       activesupport (>= 4.2)
       arel (>= 6)
     powerpack (0.1.2)
-    public_suffix (3.0.1)
+    public_suffix (3.0.3)
     quiet_assets (1.1.0)
       railties (>= 3.1, < 5.0)
     rack (1.6.10)
@@ -536,7 +536,7 @@ DEPENDENCIES
   kaminari (~> 1.1.1)
   knapsack_pro (~> 0.53.0)
   launchy (~> 2.4.3)
-  letter_opener_web (~> 1.3.2)
+  letter_opener_web (~> 1.3.4)
   mdl (~> 0.5.0)
   newrelic_rpm (~> 4.1.0.333)
   omniauth (~> 1.8.1)