diff --git a/docs/source/_static/js/custom.js b/docs/source/_static/js/custom.js
index 591c2904758..f47035b4550 100644
--- a/docs/source/_static/js/custom.js
+++ b/docs/source/_static/js/custom.js
@@ -4,7 +4,7 @@ const stableVersion = "v4.2.0"
 // Dictionary doc folder to label. The last stable version should have an empty key.
 const versionMapping = {
     "master": "master",
-    "": "v4.2.0 (stable)",
+    "": "v4.2.0/v4.2.1 (stable)",
     "v4.1.1": "v4.1.0/v4.1.1",
     "v4.0.1": "v4.0.0/v4.0.1",
     "v3.5.1": "v3.5.0/v3.5.1",