diff --git a/requirements/testing/extra.txt b/requirements/testing/extra.txt
index 248e86b53e27..8d314a141218 100644
--- a/requirements/testing/extra.txt
+++ b/requirements/testing/extra.txt
@@ -1,5 +1,6 @@
 # Extra pip requirements for the Python 3.8+ builds
 
+--prefer-binary
 ipykernel
 nbconvert[execute]!=6.0.0,!=6.0.1
 nbformat!=5.0.0,!=5.0.1