diff --git a/go.mod b/go.mod
index d0b47c1..7bd7b51 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module google.golang.org/protobuf
 
-go 1.17
+go 1.21
 
 require (
 	github.com/golang/protobuf v1.5.0
diff --git a/integration_test.go b/integration_test.go
index 0060904..fddce21 100644
--- a/integration_test.go
+++ b/integration_test.go
@@ -37,13 +37,10 @@
 	protobufVersion = "27.0-rc1"
 
 	golangVersions = func() []string {
-		// Version policy: same version as is in the x/ repos' go.mod.
+		// Version policy: oldest supported version of Go.
 		return []string{
-			"1.17.13",
-			"1.18.10",
-			"1.19.13",
-			"1.20.12",
-			"1.21.5",
+			"1.21.10",
+			"1.22.3",
 		}
 	}()
 	golangLatest = golangVersions[len(golangVersions)-1]