diff --git a/Gemfile b/Gemfile
index 68c7b3dcb08..e3e7ef2aa27 100644
--- a/Gemfile
+++ b/Gemfile
@@ -342,7 +342,7 @@ group :development, :test do
 
   gem 'capybara', '~> 2.15'
   gem 'capybara-screenshot', '~> 1.0.0'
-  gem 'selenium-webdriver', '~> 3.5'
+  gem 'selenium-webdriver', '~> 3.12'
 
   gem 'spring', '~> 2.0.0'
   gem 'spring-commands-rspec', '~> 1.0.4'
diff --git a/Gemfile.lock b/Gemfile.lock
index 2efd89bf40d..767472a8a7a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -115,7 +115,7 @@ GEM
       mime-types (>= 1.16)
     cause (0.1)
     charlock_holmes (0.7.6)
-    childprocess (0.7.0)
+    childprocess (0.9.0)
       ffi (~> 1.0, >= 1.0.11)
     chronic (0.10.2)
     chronic_duration (0.10.6)
@@ -828,9 +828,9 @@ GEM
       activesupport (>= 3.1)
     select2-rails (3.5.9.3)
       thor (~> 0.14)
-    selenium-webdriver (3.5.0)
+    selenium-webdriver (3.12.0)
       childprocess (~> 0.5)
-      rubyzip (~> 1.0)
+      rubyzip (~> 1.2)
     sentry-raven (2.7.2)
       faraday (>= 0.7.6, < 1.0)
     settingslogic (2.0.9)
@@ -1154,7 +1154,7 @@ DEPENDENCIES
   scss_lint (~> 0.56.0)
   seed-fu (~> 2.3.7)
   select2-rails (~> 3.5.9)
-  selenium-webdriver (~> 3.5)
+  selenium-webdriver (~> 3.12)
   sentry-raven (~> 2.7)
   settingslogic (~> 2.0.9)
   sham_rack (~> 1.3.6)
diff --git a/changelogs/unreleased/47183-update-selenium-webdriver-to-3-12-0.yml b/changelogs/unreleased/47183-update-selenium-webdriver-to-3-12-0.yml
new file mode 100644
index 00000000000..b0d51d810f2
--- /dev/null
+++ b/changelogs/unreleased/47183-update-selenium-webdriver-to-3-12-0.yml
@@ -0,0 +1,5 @@
+---
+title: Update selenium-webdriver to 3.12.0
+merge_request: 19351
+author: Takuya Noguchi
+type: other