diff --git a/README.md b/README.md
index c45596e..df6c922 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ folder and execute the build command.
 Make sure that you have the Python header files installed. If those are not present, install those:
 
     Ubuntu: Install the package via: apt-get install python-dev
-    OSX:    Install the latest [Python 2.7](http://www.python.org/getit/)
+    OSX:    Install Python 2.7.9 from http://www.python.org/getit/
 
 ### Windows
 Due to missing automation capabilities of the installer files (at least for the
@@ -19,10 +19,10 @@ Python installer), you are forced to manually setup the python installation.
 Follow the steps below to glue all the pieces together:
 
 #### Steps
-1. Install Python: "msiexec /i python-2.7.5.msi /passive ADDLOCAL=Extensions ALLUSERS=1"
+1. Install Python: "msiexec /i python-2.7.9.msi /passive ADDLOCAL=Extensions ALLUSERS=1"
 2. Execute the 'build.py' script with the version of Mozmill as parameter
 3. Answer the questions of the MSYS installer with 'y' and 'n'.
-4. Uninstall Python: "msiexec /x python-2.7.5.msi /passive"
+4. Uninstall Python: "msiexec /x python-2.7.9.msi /passive"
 
 ## Assets
 We don't want to be dependent on the download of most of the external tools and
diff --git a/linux/build.sh b/linux/build.sh
index 3f482d9..f28bd3a 100755
--- a/linux/build.sh
+++ b/linux/build.sh
@@ -6,8 +6,8 @@ URL_VIRTUALENV=https://codeload.github.com/pypa/virtualenv/zip/
 VERSION_PYTHON=$(python -c "import sys;print sys.version[:3]")
 VERSION_MOZMILL_AUTOMATION=$1
 
-VERSION_MERCURIAL=2.6.2
-VERSION_MOZDOWNLOAD=1.9
+VERSION_MERCURIAL=3.2.4
+VERSION_MOZDOWNLOAD=1.12
 VERSION_VIRTUALENV=1.10.1
 
 DIR_BASE=$(cd $(dirname ${BASH_SOURCE}); pwd)
diff --git a/mac/build.sh b/mac/build.sh
index 5f176f2..ee63482 100755
--- a/mac/build.sh
+++ b/mac/build.sh
@@ -6,8 +6,8 @@ URL_VIRTUALENV=https://codeload.github.com/pypa/virtualenv/zip/
 VERSION_PYTHON=$(python -c "import sys;print sys.version[:3]")
 VERSION_MOZMILL_AUTOMATION=$1
 
-VERSION_MERCURIAL=2.6.2
-VERSION_MOZDOWNLOAD=1.9
+VERSION_MERCURIAL=3.2.4
+VERSION_MOZDOWNLOAD=1.12
 VERSION_VIRTUALENV=1.10.1
 
 DIR_BASE=$(cd $(dirname ${BASH_SOURCE}); pwd)
diff --git a/windows/build.py b/windows/build.py
index 367189b..7005777 100755
--- a/windows/build.py
+++ b/windows/build.py
@@ -16,8 +16,8 @@ import zipfile
 # Link to the folder which contains the zip archives of virtualenv
 URL_VIRTUALENV = 'https://codeload.github.com/pypa/virtualenv/zip/'
 
-VERSION_MERCURIAL = '2.6.2'
-VERSION_MOZDOWNLOAD = '1.9'
+VERSION_MERCURIAL = '3.2.4'
+VERSION_MOZDOWNLOAD = '1.12'
 VERSION_VIRTUALENV = '1.10.1'
 
 dir_base = os.path.abspath(os.path.dirname(__file__))