diff --git a/go.mod b/go.mod
index ec346a0..9e6d0c1 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/plutov/paypal/v4
 
-go 1.22
+go 1.21
 
 require github.com/stretchr/testify v1.9.0