diff --git a/manifest.toml b/manifest.toml
index 197aaf2..feb7864 100644
--- a/manifest.toml
+++ b/manifest.toml
@@ -60,7 +60,7 @@ ram.runtime = "50M"
     main.url = "/"
 
     [resources.apt]
-    packages = "mariadb-server, php8.2-mysql, php8.2-gd"
+    packages = "mariadb-server, php8.2-mysql, php8.2-gd, php8.2-mbstring"
 
     [resources.database]
     type = "mysql"