diff --git a/rb/build.desc b/rb/build.desc
index 0a6686820f803..ff883a8df23b5 100644
--- a/rb/build.desc
+++ b/rb/build.desc
@@ -1,5 +1,5 @@
 rubygem(
-  version = "2.38.0",
+  version = "2.39.0.dev",
   name = "selenium-webdriver",
   dir = "build/rb",
   deps = [