diff --git a/.travis.yml b/.travis.yml
index 612a3099c..bf09f8c3d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,6 +18,7 @@ addons:
   apt:
     packages:
       - cmake
+      - python3.5
       - python3-pip
       - libbz2-dev
       - ccache
diff --git a/ChangeLog b/ChangeLog
index 22351472d..ae34ddec0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+kiwix-lib 4.0.0
+===============
+
+ * [API break] Remove support for external index.
+ * Move to the mustache templating system instead of ctpp2.
+ * Make meson.build works for meson>=0.43.0
+ * [API break] Move the basic tools from the `common` directory to `tools`.
+
 kiwix-lib 3.1.1
 ===============
 
diff --git a/meson.build b/meson.build
index 88b1d9836..45c463817 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('kiwix-lib', 'cpp',
-  version : '3.1.1',
+  version : '4.0.0',
   license : 'GPL',
   default_options : ['c_std=c11', 'cpp_std=c++11', 'werror=true'])
 
diff --git a/travis/install_deps.sh b/travis/install_deps.sh
index 7687d07b7..9c30e6a65 100755
--- a/travis/install_deps.sh
+++ b/travis/install_deps.sh
@@ -9,12 +9,16 @@ ARCHIVE_NAME=deps_${TRAVIS_OS_NAME}_${PLATFORM}_${REPO_NAME}.tar.gz
 cd $HOME
 if [[ "$TRAVIS_OS_NAME" == "osx" ]]
 then
-  pip3 install meson==0.43.0
+  pip3 install meson
 
   wget https://github.com/ninja-build/ninja/releases/download/v1.8.2/ninja-mac.zip
   unzip ninja-mac.zip ninja
 else
-  pip3 install --user meson==0.43.0
+  wget https://bootstrap.pypa.io/get-pip.py
+  python3.5 get-pip.py --user
+
+  python3.5 -m pip install --user --upgrade pip
+  python3.5 -m pip install --user meson
 
   wget https://github.com/ninja-build/ninja/releases/download/v1.8.2/ninja-linux.zip
   unzip ninja-linux.zip ninja