src/cmd/go/testdata/script/mod_readonly.txt | 6 +++---

diff --git a/src/cmd/go/testdata/script/mod_readonly.txt b/src/cmd/go/testdata/script/mod_readonly.txt
index ac581264f1f7ebac285ceb4186ec49fd1dab82f8..a5d49bc771576f0ce20da1746020db1bf40cbe3a 100644
--- a/src/cmd/go/testdata/script/mod_readonly.txt
+++ b/src/cmd/go/testdata/script/mod_readonly.txt
@@ -64,7 +64,7 @@
 -- go.mod --
 module m
 
-go 1.20
+go 1.15
 
 -- x.go --
 package x
@@ -79,7 +79,7 @@ )
 -- go.mod.redundant --
 module m
 
-go 1.20
+go 1.15
 
 require (
 	rsc.io/quote v1.5.2
@@ -89,7 +89,7 @@ )
 -- go.mod.indirect --
 module m
 
-go 1.20
+go 1.15
 
 require (
 	rsc.io/quote v1.5.2 // indirect