diff --git a/promtail/Dockerfile b/promtail/Dockerfile
index beab22a..9ffbba6 100644
--- a/promtail/Dockerfile
+++ b/promtail/Dockerfile
@@ -43,7 +43,8 @@ RUN set -eux; \
     mv /usr/bin/promtail-linux-${BINARCH} /usr/bin/promtail; \
     chmod +x /usr/bin/promtail; \
     rm /tmp/promtail.zip; \
-    mkdir -p /data/promtail
+    mkdir -p /data/promtail; \
+    rm -rf /var/lib/apt/lists/*
 
 COPY rootfs /
 WORKDIR /data/promtail