diff --git a/provision.sh b/provision.sh
index 8a19f9b2e878fc792d6c9e5b6272670d08bf10e7..e09b43afc594e29d5b876de7baf76c12997bd8cc 100755
--- a/provision.sh
+++ b/provision.sh
@@ -27,7 +27,7 @@ apt-get install -qq -y make build-essential libssl1.0-dev zlib1g-dev libbz2-dev
 sudo -i -u vagrant gpg -q --import /vagrant/provision/python_releases_signing_keys.pub
 
 # Download and build additional Python versions.
-python_versions=("3.4.9" "3.6.7" "3.7.1")
+python_versions=("3.5.9" "3.6.10" "3.7.7")
 work_directory="/home/vagrant/src"
 
 echo "Setting-up work directory."