diff --git a/docker/shared.env b/docker/shared.env
index 17abdd8..3601a07 100644
--- a/docker/shared.env
+++ b/docker/shared.env
@@ -1,4 +1,5 @@
 PYTHON_VERSIONS=(
+    cp39-cp39
     cp38-cp38
     cp37-cp37m
     cp36-cp36m