diff --git a/zulip_bots/zulip_bots/bots/dropbox_share/requirements.txt b/zulip_bots/zulip_bots/bots/dropbox_share/requirements.txt
index c9fe58e..2e3fc1e 100644
--- a/zulip_bots/zulip_bots/bots/dropbox_share/requirements.txt
+++ b/zulip_bots/zulip_bots/bots/dropbox_share/requirements.txt
@@ -1 +1,2 @@
-dropbox
+# Tests fail with Dropbox >= 11.
+dropbox==10.*