diff --git a/.env.example b/.env.example
index d84511e..0769e42 100644
--- a/.env.example
+++ b/.env.example
@@ -6,7 +6,7 @@
 # Please refer to our documentation to see all possible variables:
 #   https://www.openproject.org/docs/installation-and-operations/configuration/environment/
 #
-TAG=15-slim
+TAG=16-slim
 OPENPROJECT_HTTPS=false
 OPENPROJECT_HOST__NAME=localhost
 PORT=127.0.0.1:8080