diff --git a/composer.json b/composer.json
index 64761fe4da4..3a3211a9f66 100644
--- a/composer.json
+++ b/composer.json
@@ -62,7 +62,9 @@
     "require-dev": {
         "phpunit/phpunit": "^9.6",
         "silverstripe/versioned": "^2",
-        "squizlabs/php_codesniffer": "^3.7"
+        "squizlabs/php_codesniffer": "^3.7",
+        "silverstripe/standards": "^1",
+        "phpstan/extension-installer": "^1.3"
     },
     "conflict": {
         "egulias/email-validator": "^2",
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
new file mode 100644
index 00000000000..beb9de3c577
--- /dev/null
+++ b/phpstan.neon.dist
@@ -0,0 +1,3 @@
+parameters:
+  paths:
+    - src
diff --git a/src/Security/Group.php b/src/Security/Group.php
index cfc5a8098d5..ce9f6310eca 100755
--- a/src/Security/Group.php
+++ b/src/Security/Group.php
@@ -49,7 +49,6 @@
  *
  * @mixin Hierarchy
  * @method HasManyList<Group> Groups()
- * @method ManyManyList<Member> Members()
  * @method Group Parent()
  * @method HasManyList<Permission> Permissions()
  * @method ManyManyList<PermissionRole> Roles()
diff --git a/src/Security/Member.php b/src/Security/Member.php
index 023b96caa5d..3a0308a7335 100644
--- a/src/Security/Member.php
+++ b/src/Security/Member.php
@@ -60,7 +60,6 @@
  * @property int $FailedLoginCount
  * @property string $DateFormat
  * @property string $TimeFormat
- * @method ManyManyList<Group> Groups()
  * @method HasManyList<MemberPassword> LoggedPasswords()
  * @method HasManyList<RememberLoginHash> RememberLoginHashes()
  */