diff --git a/.gitignore b/.gitignore
index c38d050..c8761e9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,5 @@ htmlcov
 .coverage
 *.swo
 .tox
+build/
+dist/
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index 56daa94..659056d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:2.7-stretch
+FROM python:3.7.17-buster
 
 RUN mkdir -p /usr/src/app
 WORKDIR /usr/src/app
diff --git a/tox.ini b/tox.ini
index a8add48..1e8aa40 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27, py35
+envlist = py27, py37
 
 [testenv]
 commands=python setup.py test