diff --git a/migrations/m151005_151946_install.php b/migrations/m151005_151946_install.php
index 5b58110..9757985 100644
--- a/migrations/m151005_151946_install.php
+++ b/migrations/m151005_151946_install.php
@@ -9,7 +9,7 @@
  */
 class m151005_151946_install extends Migration
 {
-    public function up()
+    public function up(): void
     {
         $tableOptions = null;
         if ($this->db->driverName === 'mysql') {
@@ -75,7 +75,7 @@ public function up()
         );
     }
 
-    public function down()
+    public function down(): void
     {
         $this->dropTable(Constants::TABLE_ROLE_PERMISSIONS);
         $this->dropTable(Constants::TABLE_PERMISSIONS);
diff --git a/migrations/m170914_110639_alter_roles_permissions.php b/migrations/m170914_110639_alter_roles_permissions.php
index cf1ce67..c875aa2 100644
--- a/migrations/m170914_110639_alter_roles_permissions.php
+++ b/migrations/m170914_110639_alter_roles_permissions.php
@@ -9,7 +9,7 @@
  */
 class m170914_110639_alter_roles_permissions extends Migration
 {
-    public function up()
+    public function up(): void
     {
         //PERMISSIONS
         $this->alterColumn(
@@ -38,7 +38,7 @@ public function up()
         );
     }
 
-    public function down()
+    public function down(): void
     {
         $this->dropIndex(
             'k_' . Constants::TABLE_ROLES . '_status',
diff --git a/src/BasePermissionManager.php b/src/BasePermissionManager.php
index 14f7dca..cd617ca 100644
--- a/src/BasePermissionManager.php
+++ b/src/BasePermissionManager.php
@@ -5,19 +5,21 @@
 
 namespace cottacush\rbac;
 
+use Exception;
 use Yii;
 use yii\base\Component;
 use yii\helpers\ArrayHelper;
 
 abstract class BasePermissionManager extends Component implements ManagerInterface
 {
-    protected $sessionPrefix = 'cottacush_rbac';
+    protected string $sessionPrefix = 'cottacush_rbac';
 
     /**
+     * @throws Exception
      * @author Adegoke Obasa <goke@cottacush.com>
      * @inheritdoc
      */
-    public function canAccess($permissionKey)
+    public function canAccess($permissionKey): bool
     {
         $permissions = $this->getPermissions();
         foreach ($permissions as $permission) {
@@ -30,9 +32,10 @@ public function canAccess($permissionKey)
 
     /**
      * @param $roleKey
+     * @return mixed
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function setRoleByKey($roleKey)
+    public function setRoleByKey($roleKey): void
     {
         $role = $this->getRole($roleKey);
         Yii::$app->session->set($this->sessionPrefix . '::user_role', $role);
@@ -43,7 +46,7 @@ public function setRoleByKey($roleKey)
      * @return void
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function setRoleById($roleId)
+    public function setRoleById($roleId): void
     {
         $role = $this->getRoleById($roleId);
         Yii::$app->session->set($this->sessionPrefix . '::user_role', $role);
diff --git a/src/DbPermissionManager.php b/src/DbPermissionManager.php
index 688f3d5..bfd024f 100644
--- a/src/DbPermissionManager.php
+++ b/src/DbPermissionManager.php
@@ -9,63 +9,65 @@
 use cottacush\rbac\models\Permission;
 use cottacush\rbac\models\Role;
 use Yii;
+use yii\base\InvalidConfigException;
+use yii\db\ActiveRecord;
 
 class DbPermissionManager extends BasePermissionManager
 {
     /**
-     * @return mixed
+     * @return array
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function getRoles()
+    public function getRoles(): array
     {
         return Role::find()->asArray()->all();
     }
 
     /**
      * @param $key
-     * @return Role
+     * @return array|Role|ActiveRecord
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function getRole($key)
+    public function getRole($key): Role|array|ActiveRecord
     {
         return Role::find()->where(['key' => $key, 'status' => Constants::STATUS_ACTIVE])->limit(1)->one();
     }
 
     /**
      * @param $roleId
-     * @return Role
+     * @return array|Role|ActiveRecord
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function getRoleById($roleId)
+    public function getRoleById($roleId): Role|array|ActiveRecord
     {
         return Role::find()->where(['id' => $roleId, 'status' => Constants::STATUS_ACTIVE])->limit(1)->one();
     }
 
     /**
-     * @return mixed
+     * @return array
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function getPermissions()
+    public function getPermissions(): array
     {
         return Permission::find()->asArray()->all();
     }
 
     /**
      * @param $key
-     * @return Permission
+     * @return array|Permission|ActiveRecord
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function getPermission($key)
+    public function getPermission($key): array|ActiveRecord|Permission
     {
         return Permission::find()->where(['key' => $key, 'status' => Constants::STATUS_ACTIVE])->limit(1)->one();
     }
 
     /**
      * @param $permissionId
-     * @return Permission
+     * @return array|Permission|ActiveRecord
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function getPermissionById($permissionId)
+    public function getPermissionById($permissionId): array|ActiveRecord|Permission
     {
         return Permission::find()->where(['id' => $permissionId, 'status' => Constants::STATUS_ACTIVE])
             ->limit(1)->one();
@@ -75,18 +77,17 @@ public function getPermissionById($permissionId)
      * @return mixed
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function getUserRole()
+    public function getUserRole(): mixed
     {
-        $role = Yii::$app->session->get($this->sessionPrefix . '::user_role');
-        return $role;
+        return Yii::$app->session->get($this->sessionPrefix . '::user_role');
     }
 
     /**
      * @inheritdoc
-     * @throws \yii\base\InvalidConfigException
+     * @throws InvalidConfigException
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function getUserPermissions()
+    public function getUserPermissions(): mixed
     {
         /**
          * @var Role $role
diff --git a/src/ManagerInterface.php b/src/ManagerInterface.php
index 0e594dc..c78b3e8 100644
--- a/src/ManagerInterface.php
+++ b/src/ManagerInterface.php
@@ -14,71 +14,71 @@ interface ManagerInterface
      * @return mixed
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function canAccess($permissionKey);
+    public function canAccess($permissionKey): mixed;
 
     /**
      * @return mixed
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function getRoles();
+    public function getRoles(): mixed;
 
     /**
      * @return mixed
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function getUserRole();
+    public function getUserRole(): mixed;
 
     /**
      * @param $key
      * @return mixed
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function getRole($key);
+    public function getRole($key): mixed;
 
     /**
      * @param $roleId
      * @return mixed
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function getRoleById($roleId);
+    public function getRoleById($roleId): mixed;
 
     /**
      * @return mixed
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function getPermissions();
+    public function getPermissions(): mixed;
 
     /**
      * @param $key
      * @return mixed
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function getPermission($key);
+    public function getPermission($key): mixed;
 
     /**
      * @param $permissionId
      * @return mixed
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function getPermissionById($permissionId);
+    public function getPermissionById($permissionId): mixed;
 
     /**
      * @param $roleKey
      * @return mixed
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function setRoleByKey($roleKey);
+    public function setRoleByKey($roleKey): void;
 
     /**
      * @param $roleId
      * @return mixed
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function setRoleById($roleId);
+    public function setRoleById($roleId): void;
 
     /**
      * @return mixed
      * @author Adegoke Obasa <goke@cottacush.com>
      */
-    public function getUserPermissions();
+    public function getUserPermissions(): mixed;
 }
\ No newline at end of file