diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 3233d8b975..8965fcddba 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -17,8 +17,8 @@ Changelog
 .. Release notes for existing releases are MUTABLE! If there is something that
    was missed or can be improved, feel free to change it!
 
-[unreleased]
-------------
+[3.0.0] - 2020-03-23
+--------------------
 
 Added
 ~~~~~
@@ -26,6 +26,11 @@ Added
 * CI for covering unit and functional tests against Python 3.8 environment.
   Everything works, so we have proved Python 3.8 support
 
+* Add CI job for testing installation of Rally at Centos 8.
+
+* Updating a *latest* tag of `docker image
+  <https://hub.docker.com/r/xrally/xrally>`_ on every merged commit.
+
 Changed
 ~~~~~~~
 
diff --git a/DOCKER_README.md b/DOCKER_README.md
index 584ffd124b..dd437c7c38 100644
--- a/DOCKER_README.md
+++ b/DOCKER_README.md
@@ -17,7 +17,7 @@ additional plugins:
     #   for rally user is used.
     #
     # Tags of the image are the same as releases of xRally/Rally
-    FROM xrally/xrally:2.1.0
+    FROM xrally/xrally:3.0.0
     
     # "rally" user (which is selected by-default) is owner of "/rally" directory,
     #   so there is no need to call chown or switch the user
@@ -26,7 +26,8 @@ additional plugins:
     
     # to install package system-wide, we need to temporary switch to root user
     USER root
-    RUN pip install .
+    # disabling cache since we do not expect to install other packages
+    RUN pip3 install . --no-cache-dir
     
     # switch back to rally user for avoid permission conflicts
     USER rally
@@ -39,8 +40,8 @@ details)
 First of all, you need to pull the container. We suggest to use the last
 tagged version:
 
-    # pull the 2.1.0 image (the latest release at the point of writing the note)
-    $ docker pull xrally/xrally:2.1.0
+    # pull the 3.0.0 image (the latest release at the point of writing the note)
+    $ docker pull xrally/xrally:3.0.0
 
 **WARNING: never attach folders and volumes to `/rally` inside the container. It can break everything.**
 
@@ -56,7 +57,7 @@ docker volumes or mount the directory.
 * use docker volumes. It is the easiest way. You just need to do something like:
 
       $ docker volume create --name rally_volume
-      $ docker run -v rally_volume:/home/rally/.rally xrally/xrally:2.1.0 env create --name "foo"
+      $ docker run -v rally_volume:/home/rally/.rally xrally/xrally:3.0.0 env create --name "foo"
 
 
 * mount outer directory inside the container
diff --git a/Dockerfile b/Dockerfile
index 3119dc8eca..f45677e1d5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,6 +3,7 @@ FROM ubuntu:18.04
 RUN sed -i s/^deb-src.*// /etc/apt/sources.list
 
 RUN apt-get update && apt-get install --yes sudo python3-dev python3-pip vim git-core && \
+    apt clean && \
     pip3 install --upgrade pip && \
     useradd -u 65500 -m rally && \
     usermod -aG sudo rally && \
@@ -12,14 +13,11 @@ RUN apt-get update && apt-get install --yes sudo python3-dev python3-pip vim git
 COPY ./ /rally/source
 WORKDIR /rally/source
 
-RUN pip3 install . --constraint upper-constraints.txt && \
-    pip3 install pymysql && \
-    pip3 install psycopg2-binary && \
+RUN pip3 install . --constraint upper-constraints.txt --no-cache-dir && \
+    pip3 install pymysql psycopg2-binary --no-cache-dir && \
     mkdir -p /etc/rally && \
     echo "[database]" > /etc/rally/rally.conf && \
     echo "connection=sqlite:////home/rally/.rally/rally.db" >> /etc/rally/rally.conf
-# Cleanup pip
-RUN rm -rf /root/.cache/
 
 COPY ./etc/motd_for_docker /etc/motd
 RUN echo '[ ! -z "$TERM" -a -r /etc/motd ] && cat /etc/motd' >> /etc/bash.bashrc