diff --git a/Gemfile b/Gemfile
index 0338864eaa..53f2a6c953 100644
--- a/Gemfile
+++ b/Gemfile
@@ -140,7 +140,7 @@ gem 'fog', '~> 1.23.0', require: 'fog/aws/storage'
 group :test do
   gem 'rack-test', '~> 0.6.2'
   gem 'shoulda-context', '~> 1.2'
-  gem 'launchy', '~> 2.3.0'
+  gem 'launchy'
 
   # Require factory_girl for usage with openproject plugins testing
   # FactoryGirl needs to be available when loading app otherwise factory
diff --git a/Gemfile.lock b/Gemfile.lock
index fafc2b0941..d56bfcb22d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -135,7 +135,7 @@ GEM
       tzinfo (~> 1.1)
     acts_as_list (0.7.2)
       activerecord (>= 3.0)
-    addressable (2.3.8)
+    addressable (2.4.0)
     airbrake (5.1.0)
       airbrake-ruby (~> 1.1)
     airbrake-ruby (1.2.0)
@@ -308,7 +308,7 @@ GEM
       multi_json (~> 1.0)
       rspec (>= 2.0, < 4.0)
     kgio (2.9.3)
-    launchy (2.3.0)
+    launchy (2.4.3)
       addressable (~> 2.3)
     letter_opener (1.3.0)
       launchy (~> 2.2)
@@ -615,8 +615,8 @@ DEPENDENCIES
   htmldiff
   jruby-openssl
   json_spec
-  launchy (~> 2.3.0)
-  letter_opener
+  launchy
+  letter_opener (~> 1.3.0)
   livingstyleguide (~> 2.0.0.pre.1)
   multi_json (~> 1.11.0)
   mysql2 (~> 0.3.20)