diff --git a/docs/conf.py b/docs/conf.py
index fdd07bc..944e8d1 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -5,3 +5,8 @@
 linkcheck_anchors_ignore = [
     r"diff-.*",
 ]
+
+# Enable version chooser.
+html_context.update({
+    "display_version": True,
+})