diff --git a/gems/faraday/2.5/_test/test.rb b/gems/faraday/2.5/_test/test.rb
index 3658abc29..6df82ce48 100644
--- a/gems/faraday/2.5/_test/test.rb
+++ b/gems/faraday/2.5/_test/test.rb
@@ -85,6 +85,11 @@
 response.body
 response.success?
 
+uri = conn.build_url('/path')
+uri = conn.build_url('/path', { key: 'value' })
+uri = conn.build_url
+uri.path
+
 Faraday::FlatParamsEncoder.sort_params = true
 Faraday::FlatParamsEncoder.sort_params
 Faraday::FlatParamsEncoder.encode(a: :x)
diff --git a/gems/faraday/2.5/faraday.rbs b/gems/faraday/2.5/faraday.rbs
index be56b3c9a..2e0b64466 100644
--- a/gems/faraday/2.5/faraday.rbs
+++ b/gems/faraday/2.5/faraday.rbs
@@ -125,6 +125,8 @@ module Faraday
     def post: (?String | URI url, ?untyped body, ?untyped headers) ?{ (Faraday::Request) -> void } -> Faraday::Response
     def put: (?String | URI url, ?untyped body, ?untyped headers) ?{ (Faraday::Request) -> void } -> Faraday::Response
     def patch: (?String | URI url, ?untyped body, ?untyped headers) ?{ (Faraday::Request) -> void } -> Faraday::Response
+
+    def build_url: (?String | URI | nil url, ?Hash[Symbol | String, untyped]? extra_params) -> URI::HTTP
   end
 
   class SSLOptions