diff --git a/google/appengine.go b/google/appengine.go
deleted file mode 100644
index 564920b..0000000
--- a/google/appengine.go
+++ /dev/null
@@ -1,40 +0,0 @@
-// Copyright 2014 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package google
-
-import (
-	"context"
-	"log"
-	"sync"
-
-	"golang.org/x/oauth2"
-)
-
-var logOnce sync.Once // only spam about deprecation once
-
-// AppEngineTokenSource returns a token source that fetches tokens from either
-// the current application's service account or from the metadata server,
-// depending on the App Engine environment. See below for environment-specific
-// details. If you are implementing a 3-legged OAuth 2.0 flow on App Engine that
-// involves user accounts, see oauth2.Config instead.
-//
-// The current version of this library requires at least Go 1.17 to build,
-// so first generation App Engine runtimes (<= Go 1.9) are unsupported.
-// Previously, on first generation App Engine runtimes, AppEngineTokenSource
-// returned a token source that fetches tokens issued to the
-// current App Engine application's service account. The provided context must have
-// come from appengine.NewContext.
-//
-// Second generation App Engine runtimes (>= Go 1.11) and App Engine flexible:
-// AppEngineTokenSource is DEPRECATED on second generation runtimes and on the
-// flexible environment. It delegates to ComputeTokenSource, and the provided
-// context and scopes are not used. Please use DefaultTokenSource (or ComputeTokenSource,
-// which DefaultTokenSource will use in this case) instead.
-func AppEngineTokenSource(ctx context.Context, scope ...string) oauth2.TokenSource {
-	logOnce.Do(func() {
-		log.Print("google: AppEngineTokenSource is deprecated on App Engine standard second generation runtimes (>= Go 1.11) and App Engine flexible. Please use DefaultTokenSource or ComputeTokenSource.")
-	})
-	return ComputeTokenSource("")
-}