diff --git a/Dockerfile.nipapd b/Dockerfile.nipapd
index ac3bcd8e5..b7731c1ac 100644
--- a/Dockerfile.nipapd
+++ b/Dockerfile.nipapd
@@ -49,7 +49,8 @@ RUN apt-get update -qy && apt-get upgrade -qy \
     python3-dev \
     python3-pip \
     software-properties-common \
- && apt-get clean
+ && apt-get clean \
+ && rm -rf /var/lib/apt/lists/*
 
 # Install any additional CA certs from ca_certs folder required by corp proxies etc
 RUN mkdir /ca_certs
diff --git a/Dockerfile.www b/Dockerfile.www
index cf8ed2fdb..f81787deb 100644
--- a/Dockerfile.www
+++ b/Dockerfile.www
@@ -46,7 +46,8 @@ RUN apt-get update -qy && apt-get upgrade -qy \
     python3-pip \
     python3-dev \
  && pip3 --no-input install --no-cache-dir envtpl==0.7.2 \
- && apt-get clean
+ && apt-get clean \
+ && rm -rf /var/lib/apt/lists/*
 
 # Install any additional CA certs from ca_certs folder required by corp proxies etc
 RUN mkdir /ca_certs