diff --git a/bin/terminus.php b/bin/terminus.php
index 1b5a18740..211ec107b 100755
--- a/bin/terminus.php
+++ b/bin/terminus.php
@@ -12,10 +12,15 @@
 // Unset memory limit
 ini_set('memory_limit', -1);
 
-if (version_compare(PHP_VERSION, '8.2.0', '<') === true) {
+// Look up minimum PHP version from composer.json.
+$composer_json_contents = file_get_contents(dirname(__DIR__) . '/composer.json');
+$composer_json_data = json_decode($composer_json_contents, true);
+$min_php_version = $composer_json_data['config']['platform']['php'];
+
+if (version_compare(PHP_VERSION, $min_php_version, '<') === true) {
     fwrite(STDERR, "\n");
     fwrite(STDERR, 'Sorry, your PHP version (' . PHP_VERSION . ') is no longer supported.' . "\n");
-    fwrite(STDERR, 'Upgrade to PHP 8.2 or newer to use Terminus 4. For PHP versions prior to 8.2, downgrade to Terminus 3.x.' . "\n\n");
+    fwrite(STDERR, 'Upgrade to PHP ' . $min_php_version . ' or newer to use Terminus 4. For prior PHP versions, downgrade to Terminus 3.x.' . "\n\n");
     fwrite(STDERR, 'For more information, see https://pantheon.io/docs/terminus/updates#php-version-compatibility-matrix' . "\n\n");
     exit(1);
 }
diff --git a/composer.lock b/composer.lock
index bb49e874a..a187dc217 100644
--- a/composer.lock
+++ b/composer.lock
@@ -3351,22 +3351,23 @@
     "packages-dev": [
         {
             "name": "behat/behat",
-            "version": "v3.16.0",
+            "version": "v3.17.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/Behat/Behat.git",
-                "reference": "18f5f44c80d1cf5711ec27019afcb26b8bc6c3b0"
+                "reference": "3eb5ebae08db4e44ca6a458ba0f449dda753c465"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/Behat/Behat/zipball/18f5f44c80d1cf5711ec27019afcb26b8bc6c3b0",
-                "reference": "18f5f44c80d1cf5711ec27019afcb26b8bc6c3b0",
+                "url": "https://api.github.com/repos/Behat/Behat/zipball/3eb5ebae08db4e44ca6a458ba0f449dda753c465",
+                "reference": "3eb5ebae08db4e44ca6a458ba0f449dda753c465",
                 "shasum": ""
             },
             "require": {
                 "behat/gherkin": "^4.10.0",
                 "behat/transliterator": "^1.5",
                 "composer-runtime-api": "^2.2",
+                "composer/xdebug-handler": "^3.0",
                 "ext-mbstring": "*",
                 "php": "8.1.* || 8.2.* || 8.3.* || 8.4.* ",
                 "psr/container": "^1.0 || ^2.0",
@@ -3380,9 +3381,10 @@
             "require-dev": {
                 "herrera-io/box": "~1.6.1",
                 "phpunit/phpunit": "^9.6",
+                "sebastian/diff": "^4.0",
                 "symfony/polyfill-php84": "^1.31",
                 "symfony/process": "^5.4 || ^6.4 || ^7.0",
-                "vimeo/psalm": "^4.8"
+                "vimeo/psalm": "^5.0"
             },
             "suggest": {
                 "ext-dom": "Needed to output test results in JUnit format."
@@ -3401,7 +3403,9 @@
                     "Behat\\Hook\\": "src/Behat/Hook/",
                     "Behat\\Step\\": "src/Behat/Step/",
                     "Behat\\Behat\\": "src/Behat/Behat/",
-                    "Behat\\Testwork\\": "src/Behat/Testwork/"
+                    "Behat\\Config\\": "src/Behat/Config/",
+                    "Behat\\Testwork\\": "src/Behat/Testwork/",
+                    "Behat\\Transformation\\": "src/Behat/Transformation/"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -3433,9 +3437,9 @@
             ],
             "support": {
                 "issues": "https://github.com/Behat/Behat/issues",
-                "source": "https://github.com/Behat/Behat/tree/v3.16.0"
+                "source": "https://github.com/Behat/Behat/tree/v3.17.0"
             },
-            "time": "2024-11-08T12:25:17+00:00"
+            "time": "2024-12-18T10:27:06+00:00"
         },
         {
             "name": "behat/gherkin",