diff --git a/.circleci/config.yml b/.circleci/config.yml
index 4cb70b2..4ad0de5 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -13,6 +13,7 @@ jobs:
         <<: *defaults
         steps:
             - checkout
+            - add_ssh_keys
             - run:
                 name: Set up environment
                 command: ./.circleci/set-up-globals.sh
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2b491d1..a9d747e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,3 +13,27 @@ jobs:
         uses: pantheon-systems/phpcompatibility-action@v1
         with:
           test-versions: 7.4-
+  lint:
+    runs-on: ${{ matrix.operating-system }}
+    name: Lint checks - PHP ${{ matrix.php-versions }} on ${{ matrix.operating-system }}
+    strategy:
+      matrix:
+        operating-system: [ 'macos-latest' ]
+        php-versions: [ '7.4', '8.0', '8.2', '8.4' ]
+      max-parallel: 3
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Setup PHP with PECL extension
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: gd, mbstring, zip, ssh2-1.3.1, pcov
+          coverage: pcov
+          ini-values: error_reporting=E_ALL
+      - name: Full Composer Install
+        run: composer install
+      - name: Lint check
+        run: composer lint
+      - name: Deprecations check
+        run: composer deprecations
diff --git a/composer.json b/composer.json
index 4c384d3..84a1e7a 100644
--- a/composer.json
+++ b/composer.json
@@ -8,13 +8,14 @@
     },
     "extra": {
         "terminus": {
-            "compatible-version": "^1|^2"
+            "compatible-version": "^3 || ^4"
         }
     },
     "scripts": {
         "cs": "phpcs --standard=PSR2 -n src",
         "cbf": "phpcbf --standard=PSR2 -n src",
         "lint": "find src -name '*.php' -print0 | xargs -0 -n1 php -l",
+        "deprecations": "find src -name '*.php' -print0 | xargs -0 -n1 php -l 2>&1 >/dev/null | tee /tmp/deprecations ; [ ! -s /tmp/deprecations ]",
         "unit": "phpunit --colors=always tests",
         "functional": "TERMINUS_PLUGINS_DIR=.. PATH=tools/bin:$PATH bats -p -t tests/functional",
         "install-bats": "if [ ! -f tools/bin/bats ] ; then git clone https://github.com/sstephenson/bats.git tools/bats; tools/bats/install.sh tools; fi",