diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5240776..0de7abf 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,6 +14,7 @@ jobs:
           - "2.5"
           - "2.6"
           - "2.7"
+          - "3.0"
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby
diff --git a/Gemfile b/Gemfile
index d1172e4..0ef1cf1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,3 @@ source 'https://rubygems.org'
 gemspec
 
 gem 'rack', RUBY_VERSION < '2.2.2' ? '~> 1.6' : '>= 2.0'
-
-platforms :rbx do
-  gem 'rubysl', '~> 2.0'
-end
diff --git a/README.md b/README.md
index db001b7..be77d89 100644
--- a/README.md
+++ b/README.md
@@ -152,7 +152,7 @@ If you use the server-side flow, Facebook will give you back a longer lived acce
 
 ## Supported Rubies
 
-- Ruby MRI (2.3, 2.4, 2.5, 2.6)
+- Ruby MRI (2.5, 2.6, 2.7, 3.0)
 
 ## License