diff --git a/noxfile.py b/noxfile.py
index 9ae6b1219..d6357b3dd 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -1,6 +1,9 @@
 """Release time helpers, executed using nox.
 """
 
+import io
+import subprocess
+
 import nox