diff --git a/.phive/phars.xml b/.phive/phars.xml
index a6a3cbe..d311bfa 100644
--- a/.phive/phars.xml
+++ b/.phive/phars.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phive xmlns="https://phar.io/phive">
-  <phar name="phpstan" version="1.12.6" installed="1.12.6" location="./tools/phpstan" copy="false"/>
+  <phar name="phpstan" version="2.0.1" installed="2.0.1" location="./tools/phpstan" copy="false"/>
   <phar name="psalm" version="5.26.1" installed="5.26.1" location="./tools/psalm" copy="false"/>
 </phive>
diff --git a/src/Twig/Extension/TimeExtension.php b/src/Twig/Extension/TimeExtension.php
index 077df5e..f92553a 100644
--- a/src/Twig/Extension/TimeExtension.php
+++ b/src/Twig/Extension/TimeExtension.php
@@ -32,7 +32,7 @@
  */
 class TimeExtension extends AbstractExtension
 {
-    private ?CoreExtension $coreExt;
+    private ?CoreExtension $coreExt = null;
 
     /**
      * Get declared filters.