diff --git a/util/oauth/tokensource.go b/util/oauth/tokensource.go
index 0cdc2aaf7..f3aaa8dbc 100644
--- a/util/oauth/tokensource.go
+++ b/util/oauth/tokensource.go
@@ -4,7 +4,6 @@ import (
 	"errors"
 	"sync"
 
-	"dario.cat/mergo"
 	"golang.org/x/oauth2"
 )
 
@@ -57,8 +56,3 @@ func (ts *TokenSource) Token() (*oauth2.Token, error) {
 
 	return ts.token, nil
 }
-
-// mergeToken updates a token while preventing wiping the refresh token
-func (ts *TokenSource) mergeToken(t *oauth2.Token) error {
-	return mergo.Merge(ts.token, t, mergo.WithOverride)
-}