diff --git a/docker/Dockerfile.linux.amd64 b/docker/Dockerfile.linux.amd64
index 11571ec..8dec631 100644
--- a/docker/Dockerfile.linux.amd64
+++ b/docker/Dockerfile.linux.amd64
@@ -14,7 +14,7 @@ ENV DRONE_PLATFORM_OS linux
 ENV DRONE_PLATFORM_ARCH amd64
 
 COPY --from=alpine /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
-COPY --from=alpine /bin/tmate /bin
+COPY --from=alpine /bin/tmate /bin/
 
 LABEL com.centurylinklabs.watchtower.stop-signal="SIGINT"
 
diff --git a/docker/Dockerfile.linux.arm b/docker/Dockerfile.linux.arm
index c1c7335..3f4d586 100644
--- a/docker/Dockerfile.linux.arm
+++ b/docker/Dockerfile.linux.arm
@@ -6,7 +6,7 @@ RUN tar -xf tmate-2.4.0-static-linux-arm32v7.tar.xz
 RUN mv tmate-2.4.0-static-linux-arm32v7/tmate /bin/
 RUN chmod +x /bin/tmate
 
-FROM alpine:3
+FROM scratch
 EXPOSE 3000
 
 ENV GODEBUG netdns=go
@@ -14,6 +14,7 @@ ENV DRONE_PLATFORM_OS linux
 ENV DRONE_PLATFORM_ARCH arm
 
 COPY --from=alpine /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=alpine /bin/tmate /bin/
 
 LABEL com.centurylinklabs.watchtower.stop-signal="SIGINT"
 
diff --git a/docker/Dockerfile.linux.arm64 b/docker/Dockerfile.linux.arm64
index a660d8c..8e5b54e 100644
--- a/docker/Dockerfile.linux.arm64
+++ b/docker/Dockerfile.linux.arm64
@@ -6,7 +6,7 @@ RUN tar -xf tmate-2.4.0-static-linux-arm64v8.tar.xz
 RUN mv tmate-2.4.0-static-linux-arm64v8/tmate /bin/
 RUN chmod +x /bin/tmate
 
-FROM alpine:3
+FROM scratch
 EXPOSE 3000
 
 ENV GODEBUG netdns=go
@@ -14,6 +14,7 @@ ENV DRONE_PLATFORM_OS linux
 ENV DRONE_PLATFORM_ARCH arm64
 
 COPY --from=alpine /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=alpine /bin/tmate /bin/
 
 LABEL com.centurylinklabs.watchtower.stop-signal="SIGINT"