diff --git a/.go-version b/.go-version
index d2ab029d32..2844977405 100644
--- a/.go-version
+++ b/.go-version
@@ -1 +1 @@
-1.21
+1.21.1
diff --git a/internal/prometheus/prometheus_test.go b/internal/prometheus/prometheus_test.go
index 0d871d176e..bc9d0a934a 100644
--- a/internal/prometheus/prometheus_test.go
+++ b/internal/prometheus/prometheus_test.go
@@ -136,6 +136,7 @@ func TestJSONSerialization(t *testing.T) {
 			"go_godebug_non_default_behavior_x509sha1_events_total",
 			"go_godebug_non_default_behavior_x509usefallbackroots_events_total",
 			"go_godebug_non_default_behavior_zipinsecurepath_events_total",
+			"go_godebug_non_default_behavior_tlsmaxrsasize_events_total",
 		},
 		"SUMMARY": {
 			"go_gc_duration_seconds",