diff --git a/lib/Dockerfile.php-sql-munge b/lib/Dockerfile.php-sql-munge
index 43f3148..8cfd11c 100644
--- a/lib/Dockerfile.php-sql-munge
+++ b/lib/Dockerfile.php-sql-munge
@@ -1,4 +1,4 @@
-FROM php:5.6
+FROM php:8.1
 
 WORKDIR /