diff --git a/.travis.yml b/.travis.yml
index c944f922..340b2c7c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,7 @@ language: python
 python:
   - "pypy3"
   - "pypy"
+  - "3.9-dev"
   - "3.8"
   - "3.7"
   - "3.6"
diff --git a/requirements-optional.txt b/requirements-optional.txt
index d8be39ff..b9fe87e6 100644
--- a/requirements-optional.txt
+++ b/requirements-optional.txt
@@ -14,6 +14,4 @@ lxml ; platform_python_implementation == 'CPython'
 
 # DATrie can be used in place of our Python trie implementation for
 # slightly better parsing performance.
-# https://github.com/pytries/datrie/issues/52 although closed is not
-# yet released to https://pypi.org/project/datrie
-datrie ; platform_python_implementation == 'CPython' and python_version < '3.7'
+datrie>=0.8.2 ; platform_python_implementation == 'CPython'