diff --git a/clients/books/README.md b/clients/books/README.md
index dc1720a5ea..ccd779c766 100644
--- a/clients/books/README.md
+++ b/clients/books/README.md
@@ -11,7 +11,7 @@ Install this package from [Hex](https://hex.pm) by adding
 
 ```elixir
 def deps do
-  [{:google_api_books, "~> 0.20"}]
+  [{:google_api_books, "~> 0.21"}]
 end
 ```
 
diff --git a/clients/books/lib/google_api/books/v1/api/mylibrary.ex b/clients/books/lib/google_api/books/v1/api/mylibrary.ex
index b716886d46..5f10d16a8a 100644
--- a/clients/books/lib/google_api/books/v1/api/mylibrary.ex
+++ b/clients/books/lib/google_api/books/v1/api/mylibrary.ex
@@ -256,6 +256,7 @@ defmodule GoogleApi.Books.V1.Api.Mylibrary do
       *   `:quotaUser` (*type:* `String.t`) - Available to use for quota purposes for server-side applications. Can be any arbitrary string assigned to a user, but should not exceed 40 characters.
       *   `:uploadType` (*type:* `String.t`) - Legacy upload protocol for media (e.g. "media", "multipart").
       *   `:upload_protocol` (*type:* `String.t`) - Upload protocol for media (e.g. "raw", "multipart").
+      *   `:source` (*type:* `String.t`) - Optional. String to identify the originator of this request.
   *   `opts` (*type:* `keyword()`) - Call options
 
   ## Returns
@@ -292,7 +293,8 @@ defmodule GoogleApi.Books.V1.Api.Mylibrary do
       :prettyPrint => :query,
       :quotaUser => :query,
       :uploadType => :query,
-      :upload_protocol => :query
+      :upload_protocol => :query,
+      :source => :query
     }
 
     request =
diff --git a/clients/books/lib/google_api/books/v1/metadata.ex b/clients/books/lib/google_api/books/v1/metadata.ex
index 0b4ce555f8..b547466302 100644
--- a/clients/books/lib/google_api/books/v1/metadata.ex
+++ b/clients/books/lib/google_api/books/v1/metadata.ex
@@ -20,7 +20,7 @@ defmodule GoogleApi.Books.V1 do
   API client metadata for GoogleApi.Books.V1.
   """
 
-  @discovery_revision "20220318"
+  @discovery_revision "20240305"
 
   def discovery_revision(), do: @discovery_revision
 end
diff --git a/clients/books/mix.exs b/clients/books/mix.exs
index c274237c52..f0763f6f08 100644
--- a/clients/books/mix.exs
+++ b/clients/books/mix.exs
@@ -18,7 +18,7 @@
 defmodule GoogleApi.Books.Mixfile do
   use Mix.Project
 
-  @version "0.20.1"
+  @version "0.21.0"
 
   def project() do
     [