diff --git a/server/certificates/certificates.go b/server/certificates/certificates.go
index 42620b1..11cf0df 100644
--- a/server/certificates/certificates.go
+++ b/server/certificates/certificates.go
@@ -117,6 +117,7 @@ func TLSConfig(mainDomainSuffix string,
 		},
 		PreferServerCipherSuites: true,
 		NextProtos: []string{
+			"h2",
 			"http/1.1",
 			tlsalpn01.ACMETLS1Protocol,
 		},