diff --git a/Gemfile b/Gemfile
index 6683d70df..f4fbbe7f0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -35,7 +35,7 @@ gem 'capistrano-rbenv', '~> 2.1.1'
 gem 'capistrano-bundler', '~> 1.2.0'
 
 gem "unicode", '0.4.4.3', :platforms => [:mri_18, :mri_19]
-gem "i18n", '~> 0.8.1'
+gem "i18n", '~> 0.9.3'
 gem "bootstrap-sass", '~> 2.3.2.2' # locked because blacklight 4.7
 gem "bower-rails", "~> 0.11.0"
 gem "responders", "~> 2.4.0"
diff --git a/Gemfile.lock b/Gemfile.lock
index d5794666d..347eb0c26 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -116,6 +116,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.10.0)
+    concurrent-ruby (1.0.5)
     coveralls (0.8.21)
       json (>= 1.8, < 3)
       simplecov (~> 0.14.1)
@@ -173,7 +174,8 @@ GEM
       hydra-access-controls (= 6.5.2)
       hydra-core (= 6.5.2)
       rails (>= 3.2.6)
-    i18n (0.8.1)
+    i18n (0.9.3)
+      concurrent-ruby (~> 1.0)
     jettywrapper (2.0.3)
       activesupport (>= 3.0.0)
       childprocess
@@ -452,7 +454,7 @@ DEPENDENCIES
   devise (~> 3.5.5)
   equivalent-xml (~> 0.6.0)
   hydra-head (~> 6.5.2)
-  i18n (~> 0.8.1)
+  i18n (~> 0.9.3)
   jquery-rails (~> 4.3.1)
   kaminari (~> 0.15.1)
   launchy (~> 2.4.3)