diff --git a/app/Dockerfile b/app/Dockerfile
index 68711629..f349b033 100644
--- a/app/Dockerfile
+++ b/app/Dockerfile
@@ -9,7 +9,9 @@ ENV PYTHONUNBUFFERED 1
 
 # install psycopg2 dependencies
 RUN apt-get update \
-    && apt-get install --no-install-recommends -y python3-dev libpq-dev unixodbc-dev
+    && apt-get install --no-install-recommends -y python3-dev libpq-dev unixodbc-dev \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
 # install dependencies
 RUN pip install --upgrade pip setuptools