diff --git a/firmware/atmega/Dockerfile b/firmware/atmega/Dockerfile
index 37374b1..f4cd50b 100644
--- a/firmware/atmega/Dockerfile
+++ b/firmware/atmega/Dockerfile
@@ -1,7 +1,9 @@
 FROM ubuntu:22.04
 
+ENV DEBIAN_FRONTEND=noninteractive
+
 RUN apt-get update && \
-    DEBIAN_FRONTEND=noninteractive apt-get install -y \
+    apt-get install -y --no-install-recommends\
     build-essential \
     gcc-avr \
     avrdude \