diff --git a/go.mod b/go.mod
index 86ead94..a9f733e 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,5 @@
 module github.com/tetafro/godot
 
-go 1.16
+go 1.21
 
 require gopkg.in/yaml.v2 v2.4.0
diff --git a/testdata/check/main.go b/testdata/check/main.go
index 0f5b978..f2f51f7 100644
--- a/testdata/check/main.go
+++ b/testdata/check/main.go
@@ -92,6 +92,11 @@ type Message struct {
 	Type string
 }
 
+// Generic type [PASS].
+type Array[T int64 | float64] struct {
+	Elements []T
+}
+
 // Declaration multiline comment
 // second line
 // third line with a period [PASS].