diff --git a/.github/workflows/plugin-linting.yml b/.github/workflows/plugin-linting.yml
index c807794..6d2bb97 100644
--- a/.github/workflows/plugin-linting.yml
+++ b/.github/workflows/plugin-linting.yml
@@ -55,3 +55,12 @@ jobs:
       - name: Rubocop
         if: ${{ !cancelled() }}
         run: bundle exec rubocop .
+
+      - name: Syntax Tree
+        if: ${{ !cancelled() }}
+        run: |
+          if test -f .streerc; then
+            bundle exec stree check Gemfile $(git ls-files '*.rb') $(git ls-files '*.rake')
+          else
+            echo "Stree config not detected for this repository. Skipping."
+          fi
diff --git a/.github/workflows/plugin-tests.yml b/.github/workflows/plugin-tests.yml
index 9d390bc..f30a5be 100644
--- a/.github/workflows/plugin-tests.yml
+++ b/.github/workflows/plugin-tests.yml
@@ -80,7 +80,7 @@ jobs:
 
       - name: Get yarn cache directory
         id: yarn-cache-dir
-        run: echo "::set-output name=dir::$(yarn cache dir)"
+        run: echo "dir=$(yarn cache dir)" >> $GITHUB_OUTPUT
 
       - name: Yarn cache
         uses: actions/cache@v3
@@ -130,7 +130,7 @@ jobs:
         shell: bash
         run: |
           if [ 0 -lt $(find plugins/${{ github.event.repository.name }}/spec -type f -name "*.rb" 2> /dev/null | wc -l) ]; then
-            echo "::set-output name=files_exist::true"
+            echo "files_exist=true" >> $GITHUB_OUTPUT
           fi
 
       - name: Plugin RSpec
@@ -142,7 +142,7 @@ jobs:
         shell: bash
         run: |
           if [ 0 -lt $(find plugins/${{ github.event.repository.name }}/test/javascripts -type f \( -name "*.js" -or -name "*.es6" \) 2> /dev/null | wc -l) ]; then
-            echo "::set-output name=files_exist::true"
+            echo "files_exist=true" >> $GITHUB_OUTPUT
           fi
 
       - name: Plugin QUnit
diff --git a/.rubocop.yml b/.rubocop.yml
index d46296c..fb14dfa 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,2 +1,2 @@
 inherit_gem:
-  rubocop-discourse: default.yml
+  rubocop-discourse: stree-compat.yml
diff --git a/.streerc b/.streerc
new file mode 100644
index 0000000..0bc4379
--- /dev/null
+++ b/.streerc
@@ -0,0 +1,2 @@
+--print-width=100
+--plugins=plugin/trailing_comma
diff --git a/Gemfile b/Gemfile
index a5648b4..31d8bf7 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,4 +4,5 @@ source "https://rubygems.org"
 
 group :development do
   gem "rubocop-discourse"
+  gem "syntax_tree"
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 87ff84d..348ff70 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,6 +6,7 @@ GEM
     parallel (1.22.1)
     parser (3.1.2.1)
       ast (~> 2.4.1)
+    prettier_print (1.2.0)
     rainbow (3.1.1)
     regexp_parser (2.6.0)
     rexml (3.2.5)
@@ -27,6 +28,8 @@ GEM
     rubocop-rspec (2.13.2)
       rubocop (~> 1.33)
     ruby-progressbar (1.11.0)
+    syntax_tree (5.1.0)
+      prettier_print (>= 1.2.0)
     unicode-display_width (2.3.0)
 
 PLATFORMS
@@ -34,6 +37,7 @@ PLATFORMS
 
 DEPENDENCIES
   rubocop-discourse
+  syntax_tree
 
 BUNDLED WITH
    2.1.4
diff --git a/lib/auth/steam_authenticator.rb b/lib/auth/steam_authenticator.rb
index 3711209..f05a0d6 100644
--- a/lib/auth/steam_authenticator.rb
+++ b/lib/auth/steam_authenticator.rb
@@ -2,7 +2,7 @@
 
 class Auth::SteamAuthenticator < ::Auth::ManagedAuthenticator
   def name
-    'steam'
+    "steam"
   end
 
   def enabled?
@@ -14,9 +14,11 @@ class Auth::SteamAuthenticator < ::Auth::ManagedAuthenticator
   end
 
   def register_middleware(omniauth)
-    omniauth.provider :steam, setup: lambda { |env|
-      strategy = env["omniauth.strategy"]
-      strategy.options[:api_key] = SiteSetting.steam_web_api_key
-    }
+    omniauth.provider :steam,
+                      setup:
+                        lambda { |env|
+                          strategy = env["omniauth.strategy"]
+                          strategy.options[:api_key] = SiteSetting.steam_web_api_key
+                        }
   end
 end
diff --git a/lib/validators/enable_steam_logins_validator.rb b/lib/validators/enable_steam_logins_validator.rb
index 771a4bc..55f857d 100644
--- a/lib/validators/enable_steam_logins_validator.rb
+++ b/lib/validators/enable_steam_logins_validator.rb
@@ -6,14 +6,14 @@ class EnableSteamLoginsValidator
   end
 
   def valid_value?(val)
-    return true if val == 'f'
+    return true if val == "f"
     return false if SiteSetting.steam_web_api_key.blank?
     true
   end
 
   def error_message
     if SiteSetting.steam_web_api_key.blank?
-      I18n.t('site_settings.errors.steam_web_api_key_is_empty')
+      I18n.t("site_settings.errors.steam_web_api_key_is_empty")
     end
   end
 end
diff --git a/plugin.rb b/plugin.rb
index 9933c58..765c012 100644
--- a/plugin.rb
+++ b/plugin.rb
@@ -6,21 +6,21 @@
 # author: J. de Faye, tgxworld
 
 # omniauth-openid is not included in core since v2.4.0.beta10
-unless defined? OmniAuth::Strategies::OpenID
-  gem 'ruby-openid', '2.9.2', require: false
-  gem 'rack-openid', '1.3.1', require: false
-  gem 'omniauth-openid', '1.0.1'
+unless defined?(OmniAuth::Strategies::OpenID)
+  gem "ruby-openid", "2.9.2", require: false
+  gem "rack-openid", "1.3.1", require: false
+  gem "omniauth-openid", "1.0.1"
 end
 
-gem 'omniauth-steam', '1.0.6'
+gem "omniauth-steam", "1.0.6"
 
 register_svg_icon "fab-steam" if respond_to?(:register_svg_icon)
 
-register_asset 'stylesheets/steam-login.scss'
+register_asset "stylesheets/steam-login.scss"
 
-[
-  "../lib/auth/steam_authenticator.rb",
-  "../lib/validators/enable_steam_logins_validator.rb"
+%w[
+  ../lib/auth/steam_authenticator.rb
+  ../lib/validators/enable_steam_logins_validator.rb
 ].each { |path| load File.expand_path(path, __FILE__) }
 
-auth_provider authenticator: Auth::SteamAuthenticator.new, icon: 'fab-steam'
+auth_provider authenticator: Auth::SteamAuthenticator.new, icon: "fab-steam"
diff --git a/spec/components/validators/enable_steam_logins_validator_spec.rb b/spec/components/validators/enable_steam_logins_validator_spec.rb
index 8a2a192..bcc5f12 100644
--- a/spec/components/validators/enable_steam_logins_validator_spec.rb
+++ b/spec/components/validators/enable_steam_logins_validator_spec.rb
@@ -1,36 +1,34 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
+require "rails_helper"
 
 RSpec.describe EnableSteamLoginsValidator do
   subject { described_class.new }
 
-  describe '#valid_value?' do
-    describe 'when steam_web_api_key has not been set' do
+  describe "#valid_value?" do
+    describe "when steam_web_api_key has not been set" do
       it "should return true when value is false" do
-        expect(subject.valid_value?('f')).to eq(true)
+        expect(subject.valid_value?("f")).to eq(true)
       end
 
       it "should return false when value is true" do
-        expect(subject.valid_value?('t')).to eq(false)
+        expect(subject.valid_value?("t")).to eq(false)
 
-        expect(subject.error_message).to eq(I18n.t(
-          'site_settings.errors.steam_web_api_key_is_empty'
-        ))
+        expect(subject.error_message).to eq(
+          I18n.t("site_settings.errors.steam_web_api_key_is_empty"),
+        )
       end
     end
 
-    describe 'when steam_web_api_key has been set' do
-      before do
-        SiteSetting.steam_web_api_key = "somekey"
-      end
+    describe "when steam_web_api_key has been set" do
+      before { SiteSetting.steam_web_api_key = "somekey" }
 
       it "should return true when value is false" do
-        expect(subject.valid_value?('f')).to eq(true)
+        expect(subject.valid_value?("f")).to eq(true)
       end
 
-      it 'should return true when value is true' do
-        expect(subject.valid_value?('t')).to eq(true)
+      it "should return true when value is true" do
+        expect(subject.valid_value?("t")).to eq(true)
       end
     end
   end
diff --git a/spec/integration/steam_auth_spec.rb b/spec/integration/steam_auth_spec.rb
index 2ca385f..97140f8 100644
--- a/spec/integration/steam_auth_spec.rb
+++ b/spec/integration/steam_auth_spec.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-describe 'Steam OpenID 2.0' do
+describe "Steam OpenID 2.0" do
   let(:web_api_key) { "abcdef11223344" }
   let(:steam_user_id) { "894923402340234" }
 
@@ -11,16 +11,12 @@ describe 'Steam OpenID 2.0' do
     SiteSetting.enable_steam_logins = true
 
     cert = OpenSSL::X509::Certificate.new
-    cert.add_extension(OpenSSL::X509::Extension.new(
-      "subjectAltName",
-      "DNS:steamcommunity.com"
-    ))
+    cert.add_extension(OpenSSL::X509::Extension.new("subjectAltName", "DNS:steamcommunity.com"))
     StubSocket::StubIO.any_instance.stubs(:peer_cert).returns(cert)
 
-    stub_request(:get, "http://steamcommunity.com/openid")
-      .to_return(
-        status: 200,
-        body: <<~XML,
+    stub_request(:get, "http://steamcommunity.com/openid").to_return(
+      status: 200,
+      body: <<~XML,
           <?xml version="1.0" encoding="UTF-8"?>
           <xrds:XRDS xmlns:xrds="xri://$xrds" xmlns="xri://$xrd*($v*2.0)">
             <XRD>
@@ -31,25 +27,23 @@ describe 'Steam OpenID 2.0' do
             </XRD>
           </xrds:XRDS>
         XML
-        headers: {
-          "Content-Type" => "text/xml"
-        }
-      )
-    stub_request(:post, "https://steamcommunity.com/openid/login")
-      .to_return(
-        status: 200,
-        body: <<~BODY,
+      headers: {
+        "Content-Type" => "text/xml",
+      },
+    )
+    stub_request(:post, "https://steamcommunity.com/openid/login").to_return(
+      status: 200,
+      body: <<~BODY,
           ns:http://specs.openid.net/auth/2.0
           is_valid:true
         BODY
-        headers: {
-          "Content-Type" => "text/plain"
-        }
-      )
-    stub_request(:get, "https://steamcommunity.com/openid/id/#{steam_user_id}")
-      .to_return(
-        status: 200,
-        body: <<~BODY
+      headers: {
+        "Content-Type" => "text/plain",
+      },
+    )
+    stub_request(:get, "https://steamcommunity.com/openid/id/#{steam_user_id}").to_return(
+      status: 200,
+      body: <<~BODY,
           <?xml version="1.0" encoding="UTF-8"?>
           <xrds:XRDS xmlns:xrds="xri://$xrds" xmlns="xri://$xrd*($v*2.0)">
             <XRD>
@@ -60,16 +54,14 @@ describe 'Steam OpenID 2.0' do
             </XRD>
           </xrds:XRDS>
         BODY
-      )
-    stub_request(:get, "https://api.steampowered.com/ISteamUser/GetPlayerSummaries/v0002/?key=#{web_api_key}&steamids=#{steam_user_id}")
-      .with(
-        headers: {
-          "Host" => "api.steampowered.com"
-        }
-      )
-      .to_return(
-        status: 200,
-        body: JSON.dump(
+    )
+    stub_request(
+      :get,
+      "https://api.steampowered.com/ISteamUser/GetPlayerSummaries/v0002/?key=#{web_api_key}&steamids=#{steam_user_id}",
+    ).with(headers: { "Host" => "api.steampowered.com" }).to_return(
+      status: 200,
+      body:
+        JSON.dump(
           response: {
             players: [
               {
@@ -78,20 +70,23 @@ describe 'Steam OpenID 2.0' do
                 profilestate: 1,
                 personaname: "SteamyPlayer",
                 profileurl: "https://steamcommunity.com/id/SteamyPlayer/",
-                avatar: "https://avatars.akamai.steamstatic.com/734096e84a118c839422fa213faa6885c093374d.jpg",
-                avatarmedium: "https://avatars.akamai.steamstatic.com/734096e84a118c839422fa213faa6885c093374d_medium.jpg",
-                avatarfull: "https://avatars.akamai.steamstatic.com/734096e84a118c839422fa213faa6885c093374d_full.jpg",
+                avatar:
+                  "https://avatars.akamai.steamstatic.com/734096e84a118c839422fa213faa6885c093374d.jpg",
+                avatarmedium:
+                  "https://avatars.akamai.steamstatic.com/734096e84a118c839422fa213faa6885c093374d_medium.jpg",
+                avatarfull:
+                  "https://avatars.akamai.steamstatic.com/734096e84a118c839422fa213faa6885c093374d_full.jpg",
                 avatarhash: "734096e84a118c839422fa213faa6885c093374d",
-                lastlogoff: 1659365725,
+                lastlogoff: 1_659_365_725,
                 personastate: 0,
                 primaryclanid: "103588791859221341",
-                timecreated: 1524883291,
-                personastateflags: 0
-              }
-            ]
-          }
-        )
-      )
+                timecreated: 1_524_883_291,
+                personastateflags: 0,
+              },
+            ],
+          },
+        ),
+    )
   end
 
   it "retrieves user details from the Steam API after the authentication flow is complete" do
@@ -99,19 +94,21 @@ describe 'Steam OpenID 2.0' do
     expect(response.status).to eq(303)
     expect(response.location).to start_with("https://steamcommunity.com/openid/login")
 
-    post "/auth/steam/callback", params: {
-      _method: "post",
-      "openid.ns": "http://specs.openid.net/auth/2.0",
-      "openid.mode": "id_res",
-      "openid.op_endpoint": "https://steamcommunity.com/openid/login",
-      "openid.claimed_id": "https://steamcommunity.com/openid/id/#{steam_user_id}",
-      "openid.identity": "https://steamcommunity.com/openid/id/#{steam_user_id}",
-      "openid.return_to": "http://test.localhost/auth/steam/callback?_method=post",
-      "openid.response_nonce": "#{1.minute.ago.iso8601}aZq7eHv92/2Mg4OsPKiKcTgI0j4=",
-      "openid.assoc_handle": "1234567890",
-      "openid.signed": "signed,op_endpoint,claimed_id,identity,return_to,response_nonce,assoc_handle",
-      "openid.sig": "ZseI1sqVHGU/f5Ye7Tcn7T3QMIg=",
-    }
+    post "/auth/steam/callback",
+         params: {
+           _method: "post",
+           "openid.ns": "http://specs.openid.net/auth/2.0",
+           "openid.mode": "id_res",
+           "openid.op_endpoint": "https://steamcommunity.com/openid/login",
+           "openid.claimed_id": "https://steamcommunity.com/openid/id/#{steam_user_id}",
+           "openid.identity": "https://steamcommunity.com/openid/id/#{steam_user_id}",
+           "openid.return_to": "http://test.localhost/auth/steam/callback?_method=post",
+           "openid.response_nonce": "#{1.minute.ago.iso8601}aZq7eHv92/2Mg4OsPKiKcTgI0j4=",
+           "openid.assoc_handle": "1234567890",
+           "openid.signed":
+             "signed,op_endpoint,claimed_id,identity,return_to,response_nonce,assoc_handle",
+           "openid.sig": "ZseI1sqVHGU/f5Ye7Tcn7T3QMIg=",
+         }
     expect(response.status).to eq(302)
     expect(response.location).to eq("http://test.localhost/")
     expect(session[:current_user_id]).to be_blank
diff --git a/spec/lib/auth/steam_authenticator_spec.rb b/spec/lib/auth/steam_authenticator_spec.rb
index 8350637..897f62c 100644
--- a/spec/lib/auth/steam_authenticator_spec.rb
+++ b/spec/lib/auth/steam_authenticator_spec.rb
@@ -1,14 +1,14 @@
 # frozen_string_literal: true
 
 describe Auth::SteamAuthenticator do
-  describe '#can_revoke?' do
-    it 'should be false be default' do
+  describe "#can_revoke?" do
+    it "should be false be default" do
       authenticator = Auth::SteamAuthenticator.new
 
       expect(authenticator.can_revoke?).to eq(false)
     end
 
-    it 'should be true when steam_logins_allow_revoke site settings is enabled' do
+    it "should be true when steam_logins_allow_revoke site settings is enabled" do
       SiteSetting.steam_logins_allow_revoke = true
 
       authenticator = Auth::SteamAuthenticator.new