diff --git a/.travis.yml b/.travis.yml
index b21de242..bf64b222 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,7 @@ dist: xenial
 language: python
 jobs:
   include:
-  - python: 3.6
+  - python: 3.8
     env: TOXENV=coveralls DEPENDENCY_INJECTOR_DEBUG_MODE=1
     install:
       - pip install tox
diff --git a/tox.ini b/tox.ini
index 27bacf45..7c6a41ee 100644
--- a/tox.ini
+++ b/tox.ini
@@ -41,6 +41,9 @@ extras=
     flask
 
 [testenv:pypy]
+extras=
+    yaml
+    flask
 commands=
     unit2 discover -s tests/unit -p test_*_py2_py3.py