diff --git a/Gemfile b/Gemfile
index c0970bea0..e2c69cdc5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -23,7 +23,7 @@ gem 'nokogiri'
 
 # style
 gem 'bootstrap-sass', '~> 3.4'
-gem 'sass-rails',     '5.0.6'   # sass style
+gem 'sass-rails',     '6.0.0'   # sass style
 gem 'coffee-rails', '~> 4.2'
 gem 'jquery-rails'
 gem 'selectize-rails', '0.12.1' # include selectize.js for select
diff --git a/Gemfile.lock b/Gemfile.lock
index 8d171c86c..87cf0503f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -349,9 +349,6 @@ GEM
       activesupport (>= 5.2.1)
       i18n
       polyamorous (= 2.3.2)
-    rb-fsevent (0.10.3)
-    rb-inotify (0.10.1)
-      ffi (~> 1.0)
     rbtree3 (0.6.0)
     rdoc (4.3.0)
     regexp_parser (1.6.0)
@@ -381,19 +378,16 @@ GEM
     ruby2_keywords (0.0.2)
     rubyzip (2.2.0)
     safe_yaml (1.0.5)
-    sass (3.7.4)
-      sass-listen (~> 4.0.0)
-    sass-listen (4.0.0)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
-    sass-rails (5.0.6)
-      railties (>= 4.0.0, < 6)
-      sass (~> 3.1)
-      sprockets (>= 2.8, < 4.0)
-      sprockets-rails (>= 2.0, < 4.0)
-      tilt (>= 1.1, < 3)
+    sass-rails (6.0.0)
+      sassc-rails (~> 2.1, >= 2.1.1)
     sassc (2.2.1)
       ffi (~> 1.9)
+    sassc-rails (2.1.2)
+      railties (>= 4.0.0)
+      sassc (>= 2.0)
+      sprockets (> 3.0)
+      sprockets-rails
+      tilt
     savon (2.12.0)
       akami (~> 1.2)
       builder (>= 2.1.2)
@@ -516,7 +510,7 @@ DEPENDENCIES
   rails-settings-cached (= 0.7.2)
   ransack (~> 2.3)
   rest-client
-  sass-rails (= 5.0.6)
+  sass-rails (= 6.0.0)
   sdoc (= 0.4.1)
   select2-rails (= 3.5.9.3)
   selectize-rails (= 0.12.1)