diff --git a/Dockerfile b/Dockerfile
index 7b7b4873..ceeae714 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,11 @@
 FROM alpine:3.24@sha256:28bd5fe8b56d1bd048e5babf5b10710ebe0bae67db86916198a6eec434943f8b
+
+# GoReleaser's dockers_v2 multi-platform build stages each binary under a
+# ${TARGETPLATFORM} path (e.g. linux/amd64/rtbeat) in the build context, so the
+# COPY must be platform-qualified.
+ARG TARGETPLATFORM
 RUN apk --no-cache add ca-certificates
-COPY rtbeat /rtbeat
+COPY ${TARGETPLATFORM}/rtbeat /rtbeat
 WORKDIR /
 EXPOSE 8081
 ENTRYPOINT ["/rtbeat"]