diff --git a/Makefile b/Makefile
index f563ad6..daf0230 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,11 @@
 
 COMPOSE := docker compose
 
+# Force BuildKit so `RUN --mount=type=cache` works everywhere (older/Linux
+# Docker engines otherwise fall back to the legacy builder and fail the build).
+export DOCKER_BUILDKIT := 1
+export COMPOSE_DOCKER_CLI_BUILD := 1
+
 .DEFAULT_GOAL := help
 .PHONY: help env up build rebuild down stop restart ps logs logs-api logs-webui \
         sh-api sh-webui db-shell redis-cli migrate makemigration downgrade \