diff --git a/docker/LCM/Dockerfile b/docker/LCM/Dockerfile
index f7bcf09aef1ae272326a59064e8d68e2ce27cfb2..7a5e376812e09b3754f8bb30d57305276e4276f6 100644
--- a/docker/LCM/Dockerfile
+++ b/docker/LCM/Dockerfile
@@ -68,7 +68,8 @@ FROM ubuntu:18.04
 RUN DEBIAN_FRONTEND=noninteractive apt-get --yes update && \
     DEBIAN_FRONTEND=noninteractive apt-get --yes install \
     python3-minimal=3.6.* \
-    ca-certificates
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
 
 COPY --from=INSTALL /usr/lib/python3/dist-packages /usr/lib/python3/dist-packages
 COPY --from=INSTALL /usr/local/lib/python3.6/dist-packages  /usr/local/lib/python3.6/dist-packages
diff --git a/docker/MON/Dockerfile b/docker/MON/Dockerfile
index 7daa774e3a4645a0c32c4f407f2a3962276c62f8..719d633ab8c47190657bf462d8eaf1ea4e038e47 100644
--- a/docker/MON/Dockerfile
+++ b/docker/MON/Dockerfile
@@ -55,7 +55,8 @@ FROM ubuntu:20.04 as FINAL
 RUN DEBIAN_FRONTEND=noninteractive apt-get --yes update && \
     DEBIAN_FRONTEND=noninteractive apt-get --yes install \
     python3-minimal=3.8.* \
-    ca-certificates
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
 
 COPY --from=INSTALL /usr/lib/python3/dist-packages /usr/lib/python3/dist-packages
 COPY --from=INSTALL /usr/local/lib/python3.8/dist-packages  /usr/local/lib/python3.8/dist-packages
diff --git a/docker/NBI/Dockerfile b/docker/NBI/Dockerfile
index 3b5025675cbfc0ea9a8980f7c3504077dc8a64c0..4ac2a495c8d7fdd5293c937fcbf41eeef9b0e330 100644
--- a/docker/NBI/Dockerfile
+++ b/docker/NBI/Dockerfile
@@ -48,7 +48,8 @@ RUN pip3 install \
 FROM ubuntu:18.04 as FINAL
 
 RUN DEBIAN_FRONTEND=noninteractive apt-get --yes update && \
-    DEBIAN_FRONTEND=noninteractive apt-get --yes install python3-minimal=3.6.*
+    DEBIAN_FRONTEND=noninteractive apt-get --yes install python3-minimal=3.6.* \
+    && rm -rf /var/lib/apt/lists/*
 
 COPY --from=INSTALL /usr/lib/python3/dist-packages /usr/lib/python3/dist-packages
 COPY --from=INSTALL /usr/local/lib/python3.6/dist-packages  /usr/local/lib/python3.6/dist-packages
diff --git a/docker/NG-UI/Dockerfile b/docker/NG-UI/Dockerfile
index b7ca8f7b12eb320e0493a75e1a64a292e113b332..163441fbb1495c8d84dedf62d94bb80872b93911 100644
--- a/docker/NG-UI/Dockerfile
+++ b/docker/NG-UI/Dockerfile
@@ -27,7 +27,8 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get --yes update && \
 RUN curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add - && \
     echo "deb https://deb.nodesource.com/node_10.x xenial main" | tee -a /etc/apt/sources.list.d/nodesource.list && \
     apt-get update && \
-    apt-get install -y nodejs=10.24.*
+    apt-get install -y nodejs=10.24.* \
+    && rm -rf /var/lib/apt/lists/*
 
 ARG OSM_NGUI_URL
 
diff --git a/docker/PLA/Dockerfile b/docker/PLA/Dockerfile
index 712a095a34a95abf4fb32f9190f9fd07e2561484..8d4350bcfab4be42f78576e42656a47106adc917 100644
--- a/docker/PLA/Dockerfile
+++ b/docker/PLA/Dockerfile
@@ -46,7 +46,8 @@ FROM ubuntu:18.04
 LABEL authors="Lars-Göran Magnusson"
 
 RUN DEBIAN_FRONTEND=noninteractive apt-get --yes update && \
-    DEBIAN_FRONTEND=noninteractive apt-get --yes install python3-minimal=3.6.*
+    DEBIAN_FRONTEND=noninteractive apt-get --yes install python3-minimal=3.6.* \
+    && rm -rf /var/lib/apt/lists/*
 
 COPY --from=INSTALL /usr/lib/python3/dist-packages /usr/lib/python3/dist-packages
 COPY --from=INSTALL /usr/local/lib/python3.6/dist-packages  /usr/local/lib/python3.6/dist-packages
diff --git a/docker/POL/Dockerfile b/docker/POL/Dockerfile
index f78283a566628111828086842d3ad324a7b830fd..3e708b7392fae7e4672e8b2461d59ca3c8c2d13d 100644
--- a/docker/POL/Dockerfile
+++ b/docker/POL/Dockerfile
@@ -48,7 +48,8 @@ RUN pip3 install \
 FROM ubuntu:20.04 as FINAL
 
 RUN DEBIAN_FRONTEND=noninteractive apt-get --yes update && \
-    DEBIAN_FRONTEND=noninteractive apt-get --yes install python3-minimal=3.8.*
+    DEBIAN_FRONTEND=noninteractive apt-get --yes install python3-minimal=3.8.* \
+    && rm -rf /var/lib/apt/lists/*
 
 COPY --from=INSTALL /usr/lib/python3/dist-packages /usr/lib/python3/dist-packages
 COPY --from=INSTALL /usr/local/lib/python3.8/dist-packages  /usr/local/lib/python3.8/dist-packages
diff --git a/docker/RO/Dockerfile b/docker/RO/Dockerfile
index ba7d54d1515eb191d9d6d4b32e43650e365de4e1..04f7c4c77581aefc611eab6624e7151fba824f31 100644
--- a/docker/RO/Dockerfile
+++ b/docker/RO/Dockerfile
@@ -81,7 +81,8 @@ RUN pip3 install \
 FROM ubuntu:18.04
 
 RUN DEBIAN_FRONTEND=noninteractive apt-get --yes update && \
-    DEBIAN_FRONTEND=noninteractive apt-get --yes install python3-minimal=3.6.*
+    DEBIAN_FRONTEND=noninteractive apt-get --yes install python3-minimal=3.6.* \
+    && rm -rf /var/lib/apt/lists/*
 
 COPY --from=INSTALL /usr/lib/python3/dist-packages /usr/lib/python3/dist-packages
 COPY --from=INSTALL /usr/local/lib/python3.6/dist-packages  /usr/local/lib/python3.6/dist-packages