diff --git a/Gemfile b/Gemfile
index 39d532117..07c208c15 100644
--- a/Gemfile
+++ b/Gemfile
@@ -58,7 +58,7 @@ group :development, :test do
   gem 'pry'
   gem 'pry-byebug'
   gem 'capybara', '~> 2.14.0'
-  gem 'selenium-webdriver', '3.4.0'
+  gem 'selenium-webdriver', '3.142.7'
   gem 'launchy', '~> 2.4.3'
   gem "minitest", '~> 5.10.2'
   gem 'rspec-rails', '3.6.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 165fbcd88..1b517f117 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -115,8 +115,7 @@ GEM
       rack (>= 1.0.0)
       rack-test (>= 0.5.4)
       xpath (~> 2.0)
-    childprocess (0.5.6)
-      ffi (~> 1.0, >= 1.0.11)
+    childprocess (3.0.0)
     chronic (0.10.2)
     cliver (0.3.2)
     coderay (1.1.1)
@@ -155,7 +154,6 @@ GEM
     faraday (0.12.1)
       multipart-post (>= 1.2, < 3)
     fastercsv (1.5.5)
-    ffi (1.11.1)
     globalid (0.4.2)
       activesupport (>= 4.2.0)
     hashie (3.5.6)
@@ -390,10 +388,9 @@ GEM
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
     scrub_rb (1.0.1)
-    selenium-webdriver (3.4.0)
-      childprocess (~> 0.5)
-      rubyzip (~> 1.0)
-      websocket (~> 1.0)
+    selenium-webdriver (3.142.7)
+      childprocess (>= 0.5, < 4.0)
+      rubyzip (>= 1.2.2)
     simplecov (0.14.1)
       docile (~> 1.1.0)
       json (>= 1.8, < 3)
@@ -443,7 +440,6 @@ GEM
       raindrops (~> 0.7)
     warden (1.2.6)
       rack (>= 1.0)
-    websocket (1.2.4)
     websocket-driver (0.6.5)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.2)
@@ -503,7 +499,7 @@ DEPENDENCIES
   rubocop-rspec (= 1.15.1)
   rubyzip (= 1.3.0)
   sass-rails (~> 5.0.5)
-  selenium-webdriver (= 3.4.0)
+  selenium-webdriver (= 3.142.7)
   share_notify!
   simplecov (~> 0.14.1)
   sitemap_generator (~> 5.3.1)