diff --git a/deploy-guide/source/overview-requirements.rst b/deploy-guide/source/overview-requirements.rst
index b89649e1f8..2c4bb6629b 100644
--- a/deploy-guide/source/overview-requirements.rst
+++ b/deploy-guide/source/overview-requirements.rst
@@ -6,7 +6,7 @@ following minimum requirements:
 
 * Debian
 
-  * Debian 9 (stretch)
+  * Debian 10 (buster)
 
   * Linux kernel version ``4.9.0-0-amd64`` or later is required.
 
@@ -34,7 +34,7 @@ following minimum requirements:
 * Network Time Protocol (NTP) client for time synchronization (such as
   ``ntpd`` or ``chronyd``)
 
-* Python 2.7.*x*
+* Python 3.6.*x* or 3.7.*x*
 
 * en_US.UTF-8 as the locale
 
diff --git a/deploy-guide/source/targethosts-prepare.rst b/deploy-guide/source/targethosts-prepare.rst
index f139cc313f..77449a7918 100644
--- a/deploy-guide/source/targethosts-prepare.rst
+++ b/deploy-guide/source/targethosts-prepare.rst
@@ -12,8 +12,9 @@ Install one of the following supported operating systems on the
 target host:
 
 * Ubuntu server 18.04 (Bionic Beaver) LTS 64-bit
+* Debian 10 64-bit
 * Centos 7 64-bit
-* openSUSE 42.X 64-bit
+* openSUSE 15.X 64-bit
 
 Configure at least one network interface to access the Internet or
 suitable local repositories.