diff --git a/requirements.txt b/requirements.txt
index be5004a..c9621d1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 schema-salad >= 1.14
 typing>=3.6,<3.7; python_version < '3.5'
 futures >= 3.0.5; python_version == '2.7'
-subprocess32; python_version < '3'
+subprocess32 == 3.5.0rc1; python_version < '3'
 junit-xml >= 1.8
diff --git a/setup.py b/setup.py
index 99d0301..4fde0c7 100755
--- a/setup.py
+++ b/setup.py
@@ -48,6 +48,6 @@
       zip_safe=True,
       cmdclass={'egg_info': tagger},
       extras_require={':python_version<"3"': [
-                      'futures >= 3.0.5', 'subprocess32'],
+                      'futures >= 3.0.5', 'subprocess32 == 3.5.0rc1'],
                       ':python_version<"3.5"': ['typing >= 3.5.2'] }
 )