diff --git a/.github/hooks/pre-push b/.github/hooks/pre-push
new file mode 100755
index 0000000..661e72b
--- /dev/null
+++ b/.github/hooks/pre-push
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+elixir scripts/validate_version.exs
+
+if [ $? -ne 0 ]; then
+    exit 1
+fi
diff --git a/CHANGES.txt b/CHANGES.txt
index fb909ee..c4a33fd 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,6 @@
+0.2.1 (February 24, 2025):
+ - Fixed the SDK language version to correctly reflect the package version when it's installed from hex.pm.
+
 0.2.0 (February 14, 2025):
  - Added new variations of the get treatment functions to support evaluating flags in given flag set/s: `Split.get_treatments_by_flag_set/3`, `Split.get_treatments_by_flag_sets/3`, `Split.get_treatments_with_config_by_flag_set/3`, and `Split.get_treatments_with_config_by_flag_sets/3`.
  - Updated the `:socket_path` option for `Split.Supervisor.start_link/1` to be optional, defaulting to `"/var/run/splitd.sock"`.
diff --git a/lib/split/rpc/message.ex b/lib/split/rpc/message.ex
index 3a74147..4dbd5cc 100644
--- a/lib/split/rpc/message.ex
+++ b/lib/split/rpc/message.ex
@@ -5,7 +5,7 @@ defmodule Split.RPC.Message do
   use Split.RPC.Opcodes
 
   @protocol_version 0x01
-  @client_id "Splitd_Elixir-" <> to_string(Application.spec(:split, :vsn))
+  @client_id "Splitd_Elixir-0.2.1-rc.0"
 
   @type opcode :: unquote(Enum.reduce(@opcodes, &{:|, [], [&1, &2]}))
   @type protocol_version :: unquote(@protocol_version)
@@ -37,7 +37,7 @@ defmodule Split.RPC.Message do
   ## Examples
 
       iex> Message.register()
-      %Message{v: 1, o: 0, a: ["123", "Splitd_Elixir-", 1]}
+      %Message{v: 1, o: 0, a: ["123", "Splitd_Elixir-0.2.1-rc.0", 1]}
   """
   @spec register() :: t()
   def register, do: %__MODULE__{o: @register_opcode, a: ["123", @client_id, 1]}
diff --git a/mix.exs b/mix.exs
index 2caeccf..409c057 100644
--- a/mix.exs
+++ b/mix.exs
@@ -4,7 +4,7 @@ defmodule SplitThinElixir.MixProject do
   def project do
     [
       app: :split,
-      version: "0.2.0",
+      version: "0.2.1-rc.0",
       elixir: "~> 1.14",
       elixirc_paths: elixirc_paths(Mix.env()),
       start_permanent: Mix.env() == :prod,
diff --git a/scripts/validate_version.exs b/scripts/validate_version.exs
new file mode 100644
index 0000000..fe9cfe0
--- /dev/null
+++ b/scripts/validate_version.exs
@@ -0,0 +1,22 @@
+#!/usr/bin/env elixir
+
+# Read mix.exs version
+{:ok, mix_content} = File.read("mix.exs")
+version = Regex.run(~r/version: "([^"]+)"/, mix_content)
+|> Enum.at(1)
+
+# Read message.ex @client_id
+{:ok, message_content} = File.read("lib/split/rpc/message.ex")
+client_id_version = Regex.run(~r/@client_id "Splitd_Elixir-([^"]+)"/, message_content)
+|> Enum.at(1)
+
+if version != client_id_version do
+  IO.puts :stderr, """
+  Error: Version mismatch!
+  mix.exs version: #{version}
+  message.ex @client_id version: #{client_id_version}
+
+  Please update the @client_id in lib/split/rpc/message.ex to match the version in mix.exs
+  """
+  System.halt(1)
+end