diff --git a/Gemfile b/Gemfile
index 38381d34b6b..4c4a61bb4e4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -339,7 +339,7 @@ group :development, :test do
   gem 'rubocop', '~> 0.52.0'
   gem 'rubocop-rspec', '~> 1.20.1'
 
-  gem 'scss_lint', '~> 0.54.0', require: false
+  gem 'scss_lint', '~> 0.56.0', require: false
   gem 'haml_lint', '~> 0.26.0', require: false
   gem 'simplecov', '~> 0.14.0', require: false
   gem 'flay', '~> 2.8.0', require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index 2a81c81b0f8..c854cda48ea 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -695,6 +695,9 @@ GEM
       rake
     raindrops (0.18.0)
     rake (12.3.0)
+    rb-fsevent (0.10.2)
+    rb-inotify (0.9.10)
+      ffi (>= 0.5.0, < 2)
     rblineprof (0.3.6)
       debugger-ruby_core_source (~> 1.3)
     rbnacl (4.0.2)
@@ -809,7 +812,11 @@ GEM
     safe_yaml (1.0.4)
     sanitize (2.1.0)
       nokogiri (>= 1.4.4)
-    sass (3.4.22)
+    sass (3.5.5)
+      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)
@@ -819,9 +826,9 @@ GEM
     sawyer (0.8.1)
       addressable (>= 2.3.5, < 2.6)
       faraday (~> 0.8, < 1.0)
-    scss_lint (0.54.0)
+    scss_lint (0.56.0)
       rake (>= 0.9, < 13)
-      sass (~> 3.4.20)
+      sass (~> 3.5.3)
     securecompare (1.0.0)
     seed-fu (2.3.6)
       activerecord (>= 3.1)
@@ -1162,7 +1169,7 @@ DEPENDENCIES
   rugged (~> 0.26.0)
   sanitize (~> 2.0)
   sass-rails (~> 5.0.6)
-  scss_lint (~> 0.54.0)
+  scss_lint (~> 0.56.0)
   seed-fu (= 2.3.6)
   select2-rails (~> 3.5.9)
   selenium-webdriver (~> 3.5)
diff --git a/changelogs/unreleased/41754-update-scss-lint-to-0-56-0.yml b/changelogs/unreleased/41754-update-scss-lint-to-0-56-0.yml
new file mode 100644
index 00000000000..b96dd376cec
--- /dev/null
+++ b/changelogs/unreleased/41754-update-scss-lint-to-0-56-0.yml
@@ -0,0 +1,5 @@
+---
+title: Update scss-lint to 0.56.0
+merge_request: 16278
+author: Takuya Noguchi
+type: other