diff --git a/bin/template/Gemfile b/bin/template/Gemfile
index 28f2d10..b27edc9 100644
--- a/bin/template/Gemfile
+++ b/bin/template/Gemfile
@@ -13,7 +13,7 @@ gem 'rubypants'
 gem 'sass'
 
 # references
-gem 'i18n', '< 1.14.9'
+gem 'i18n', '< 1.15.3'
 gem 'latex-decode'
 gem 'unicode_utils'
 gem 'citeproc-ruby', '>= 1.1.6'
diff --git a/bin/template/Gemfile.lock b/bin/template/Gemfile.lock
index 2dc73fb..273422a 100644
--- a/bin/template/Gemfile.lock
+++ b/bin/template/Gemfile.lock
@@ -23,7 +23,7 @@ GEM
       csl (~> 2.0)
       observer (< 1.0)
     coderay (1.1.3)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.8)
     cri (2.15.12)
     csl (2.2.1)
       forwardable (~> 1.3)
@@ -75,7 +75,7 @@ GEM
       guard (~> 2.3)
       spoon
     http_parser.rb (0.8.1)
-    i18n (1.14.8)
+    i18n (1.15.2)
       concurrent-ruby (~> 1.0)
     immutable-ruby (0.2.0)
       concurrent-ruby (~> 1.1)
@@ -233,7 +233,7 @@ DEPENDENCIES
   guard-livereload
   guard-nanoc (~> 2.1.11)
   guard-rack
-  i18n (< 1.14.9)
+  i18n (< 1.15.3)
   kramdown
   latex-decode
   nanoc (~> 4.14, >= 4.14.7)