diff --git a/INSTALL/INSTALL.centos6.txt b/INSTALL/INSTALL.centos6.txt
index 61f4ff523..b311419dc 100644
--- a/INSTALL/INSTALL.centos6.txt
+++ b/INSTALL/INSTALL.centos6.txt
@@ -54,6 +54,7 @@ cd /var/www/MISP/app/files/scripts
 git clone https://github.com/CybOXProject/python-cybox.git
 git clone https://github.com/STIXProject/python-stix.git
 cd /var/www/MISP/app/files/scripts/python-cybox
+git checkout v2.1.0.11
 git config core.filemode false
 # If you umask is has been changed from the default, it is a good idea to reset it to 0022 before installing python modules
 UMASK=$(umask)
diff --git a/INSTALL/INSTALL.centos7.txt b/INSTALL/INSTALL.centos7.txt
index 47df17dd1..b855f9f20 100644
--- a/INSTALL/INSTALL.centos7.txt
+++ b/INSTALL/INSTALL.centos7.txt
@@ -54,6 +54,7 @@ cd /var/www/MISP/app/files/scripts
 git clone https://github.com/CybOXProject/python-cybox.git
 git clone https://github.com/STIXProject/python-stix.git
 cd /var/www/MISP/app/files/scripts/python-cybox
+git checkout v2.1.0.11
 git config core.filemode false
 # If you umask is has been changed from the default, it is a good idea to reset it to 0022 before installing python modules
 UMASK=$(umask)
diff --git a/INSTALL/INSTALL.ubuntu1404.txt b/INSTALL/INSTALL.ubuntu1404.txt
index 7c7d25576..060c9b288 100644
--- a/INSTALL/INSTALL.ubuntu1404.txt
+++ b/INSTALL/INSTALL.ubuntu1404.txt
@@ -47,6 +47,7 @@ cd /var/www/MISP/app/files/scripts
 git clone https://github.com/CybOXProject/python-cybox.git
 git clone https://github.com/STIXProject/python-stix.git
 cd /var/www/MISP/app/files/scripts/python-cybox
+git checkout v2.1.0.11
 python setup.py install
 cd /var/www/MISP/app/files/scripts/python-stix
 python setup.py install