diff --git a/.travis.yml b/.travis.yml
index 524f0998..e7b949f0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,7 @@ python:
   - "3.6"
   - "3.7"
   - "3.8"
+  - "3.9"
 
 # command to install dependencies
 install:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 128a892d..a5eba75f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 NEWS for Python X Library
 
+Version 0.29
+============
+
+Extensions
+--------------------
+
+- Drawable & XInput: Avoid using array.array.tostring() which wiil be removed in Python 3.9 (thanks @t-wissmann).
+
+---
 Version 0.28
 ============
 
diff --git a/Xlib/__init__.py b/Xlib/__init__.py
index e38da5ea..2ff7aabc 100644
--- a/Xlib/__init__.py
+++ b/Xlib/__init__.py
@@ -19,7 +19,7 @@
 #    Suite 330,
 #    Boston, MA 02111-1307 USA
 
-__version__ = (0, 28)
+__version__ = (0, 29)
 
 __version_extra__ = ''
 
diff --git a/Xlib/ext/xinput.py b/Xlib/ext/xinput.py
index fee0d93c..e219bffe 100644
--- a/Xlib/ext/xinput.py
+++ b/Xlib/ext/xinput.py
@@ -236,7 +236,7 @@ def fun(val):
         else:
             mask_seq.extend(val)
 
-        return mask_seq.tostring(), len(mask_seq), None
+        return rq.encode_array(mask_seq), len(mask_seq), None
 
 EventMask = rq.Struct(
     DEVICE('deviceid'),