diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 690f11bb..8df12fdd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,6 +1,6 @@
 name: ci
 
-on: push
+on: [push, pull_request]
 
 jobs:
     suite:
@@ -10,7 +10,7 @@ jobs:
             fail-fast: false
             matrix:
                 os: [ubuntu-latest]
-                php: ["8.0", "8.1", "8.2"]
+                php: ["8.0", "8.1", "8.2", "8.3"]
 
         steps:
             - name: Set up PHP
diff --git a/src/Prismic/Variation.php b/src/Prismic/Variation.php
index e14d8f66..d1114aaa 100644
--- a/src/Prismic/Variation.php
+++ b/src/Prismic/Variation.php
@@ -17,7 +17,7 @@ class Variation
      * Variation Release Ref
      * @var string
      */
-    private $ref;
+    private $ref = "";
 
     /**
      * Variation Label