diff --git a/CI/ubuntu1604.Dockerfile b/CI/ubuntu1604.Dockerfile
index ddcc11cb2..23638cc0c 100644
--- a/CI/ubuntu1604.Dockerfile
+++ b/CI/ubuntu1604.Dockerfile
@@ -11,8 +11,9 @@ FROM ubuntu:16.04
 RUN \
   sed -i 's/# \(.*multiverse$\)/\1/g' /etc/apt/sources.list && \
   apt-get update && \
-  apt-get install -y git cmake qtbase5-dev qttools5-dev build-essential libx11-dev libxtst-dev libgl1-mesa-dev libssl-dev libavahi-compat-libdnssd-dev && \
-  apt-get install -y debhelper devscripts
+  apt-get install -y git cmake qtbase5-dev build-essential libx11-dev libxtst-dev libgl1-mesa-dev libssl-dev libavahi-compat-libdnssd-dev debhelper devscripts && \
+  sudo apt-get -y install qttools5-dev qttools5-dev-tools --no-install-recommends && \
+  rm -rf /var/lib/apt/lists/*
   
 # Set environment variables.
 ENV HOME /root
diff --git a/CI/ubuntu1804.Dockerfile b/CI/ubuntu1804.Dockerfile
index c6369e772..6500e3e13 100644
--- a/CI/ubuntu1804.Dockerfile
+++ b/CI/ubuntu1804.Dockerfile
@@ -11,8 +11,10 @@ FROM ubuntu:18.04
 RUN \
   sed -i 's/# \(.*multiverse$\)/\1/g' /etc/apt/sources.list && \
   apt-get update && \
-  apt-get install -y git cmake qtbase5-dev qttools5-dev build-essential libx11-dev libxtst-dev libgl1-mesa-dev libssl-dev libavahi-compat-libdnssd-dev && \
-  apt-get install -y debhelper devscripts
+  apt-get install -y git cmake qtbase5-dev build-essential libx11-dev libxtst-dev libgl1-mesa-dev libssl-dev libavahi-compat-libdnssd-dev debhelper devscripts && \
+  sudo apt-get -y install qttools5-dev qttools5-dev-tools --no-install-recommends && \
+  rm -rf /var/lib/apt/lists/*
+
 
 # Set environment variables.
 ENV HOME /root
diff --git a/CI/ubuntu1904.Dockerfile b/CI/ubuntu1904.Dockerfile
index 705c2c1cd..ef2473242 100644
--- a/CI/ubuntu1904.Dockerfile
+++ b/CI/ubuntu1904.Dockerfile
@@ -11,8 +11,9 @@ FROM ubuntu:19.04
 RUN \
   sed -i 's/# \(.*multiverse$\)/\1/g' /etc/apt/sources.list && \
   apt-get update && \
-  apt-get install -y git cmake qtbase5-dev qttools5-dev build-essential libx11-dev libxtst-dev libgl1-mesa-dev libssl-dev libavahi-compat-libdnssd-dev && \
-  apt-get install -y debhelper devscripts
+  apt-get install -y git cmake qtbase5-dev build-essential libx11-dev libxtst-dev libgl1-mesa-dev libssl-dev libavahi-compat-libdnssd-dev debhelper devscripts && \
+  sudo apt-get -y install qttools5-dev qttools5-dev-tools --no-install-recommends && \
+  rm -rf /var/lib/apt/lists/*
   
 # Set environment variables.
 ENV HOME /root