diff --git a/Dockerfile b/Dockerfile
index e7f2f7f495f..0fd53190dcd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.12
+# syntax=docker/dockerfile:1.18
 
 # This file is designed for production server deployment, not local development work
 # For a containerized local dev environment, see: https://github.com/mastodon/mastodon/blob/main/docs/DEVELOPMENT.md#docker
diff --git a/streaming/Dockerfile b/streaming/Dockerfile
index 0ddde2f8dc6..679425dfcc2 100644
--- a/streaming/Dockerfile
+++ b/streaming/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.12
+# syntax=docker/dockerfile:1.18
 
 # Please see https://docs.docker.com/engine/reference/builder for information about
 # the extended buildx capabilities used in this file.