diff --git a/Dockerfile b/Dockerfile
index 7a78561..0e00b3c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,8 @@ FROM heroku/heroku:16-build
 WORKDIR /app
 ENV WORKSPACE_DIR="/app/builds" \
     S3_BUCKET="lang-python" \
-    S3_PREFIX="heroku-16/"
+    S3_PREFIX="heroku-16/" \
+    DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update && apt-get install -y python-pip && rm -rf /var/lib/apt/lists/*
 
diff --git a/Dockerfile.heroku-18 b/Dockerfile.heroku-18
index d34e948..466506a 100644
--- a/Dockerfile.heroku-18
+++ b/Dockerfile.heroku-18
@@ -3,7 +3,8 @@ FROM heroku/heroku:18-build
 WORKDIR /app
 ENV WORKSPACE_DIR="/app/builds" \
     S3_BUCKET="lang-python" \
-    S3_PREFIX="heroku-18/"
+    S3_PREFIX="heroku-18/" \
+    DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update && apt-get install -y python-pip && rm -rf /var/lib/apt/lists/*