diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2106f26..7424f1a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -6,7 +6,7 @@ py39:
   stage: test
   image: python:3-alpine
   before_script:
-    - apk add --no-cache libmagic
+    - apk add --no-cache libmagic libxml2-dev libxslt-dev
     - pip install tox --no-cache-dir
   script: tox -e py39
 
diff --git a/tox.ini b/tox.ini
index d9a9ec9..cee3f53 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py38
+    py39
 
     linters
 skipsdist = True