diff --git a/.circleci/config.yml b/.circleci/config.yml
index 9517e8dd9..7a357339f 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -31,7 +31,7 @@ jobs:
         brew update
         python --version
         sudo -H pip install --upgrade virtualenv
-        brew install pyenv
+        brew install pyenv -v 1.2.13
         echo 'eval "$(pyenv init -)"' >> ~/.bash_profile
         source ~/.bash_profile
         pyenv install 3.4.8
diff --git a/setup.py b/setup.py
index 58c66cae7..c6a2e233e 100755
--- a/setup.py
+++ b/setup.py
@@ -30,11 +30,13 @@ def test_suite():
     test_suite='setup.test_suite',
     install_requires=[
         'ply',
+        'pyparsing<=1.5.7;python_version<="2.8"',
         'rdflib',
         'six',
         'pyyaml',
         'xmltodict',
     ],
+    python_requires='>=2.7',
     entry_points={
         'console_scripts': [
             'spdx-tv2rdf = spdx.tv_to_rdf:main',