diff --git a/tests/requirements.txt b/tests/requirements.txt
index c1576a2e7..790f29d34 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -10,4 +10,4 @@ brotlipy
 testfixtures
 # optional for shell wrapper tests
 bpython
-ipython
+ipython<6.0