diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index d14651c48..64bac5130 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -47,7 +47,7 @@ jobs:
         uses: ramsey/composer-install@v2
 
       - name: "Run phan"
-        run: php vendor/bin/phan
+        run: php vendor/bin/phan --target-php-version=${{ matrix.php-version }}
 
 
   build-docs:
diff --git a/.phan/config.php b/.phan/config.php
index 6f19c1fb1..ccd457662 100644
--- a/.phan/config.php
+++ b/.phan/config.php
@@ -14,7 +14,8 @@ return [
 	// Note that the **only** effect of choosing `'5.6'` is to infer
 	// that functions removed in php 7.0 exist.
 	// (See `backward_compatibility_checks` for additional options)
-	'target_php_version' => '7.4',
+	'target_php_version' => null,
+	'minimum_target_php_version' => '7.4',
 
 	// A list of directories that should be parsed for class and
 	// method information. After excluding the directories