diff --git a/dotnet/selenium-dotnet-version.bzl b/dotnet/selenium-dotnet-version.bzl
index 1a8c8f31a1449..58079d01b5826 100644
--- a/dotnet/selenium-dotnet-version.bzl
+++ b/dotnet/selenium-dotnet-version.bzl
@@ -1,6 +1,6 @@
 # BUILD FILE SYNTAX: STARLARK
 
-SE_VERSION = "4.20.0"
+SE_VERSION = "4.21.0-nightly202404242344"
 ASSEMBLY_VERSION = "4.0.0.0"
 SUPPORTED_NET_STANDARD_VERSIONS = ["netstandard2.0"]