diff --git a/test-requirements-cpython.txt b/test-requirements-cpython.txt
index 51061ff7d41..db74d13ce46 100644
--- a/test-requirements-cpython.txt
+++ b/test-requirements-cpython.txt
@@ -1,4 +1,4 @@
 jupyter
 line_profiler
-# transitive dependency of jupyter (18.0.0 is broken)
-pyzmq<18
+# transitive dependency of jupyter (17.0+ lacks wheels for Py3.4)
+pyzmq<17