diff --git a/firefox.spec b/firefox.spec
index 0bace7f..61059bd 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -109,7 +109,7 @@ ExcludeArch: s390x
 %if %{?system_nss}
 %global nspr_version 4.21
 %global nspr_build_version %{nspr_version}
-%global nss_version 3.63
+%global nss_version 3.64
 %global nss_build_version %{nss_version}
 %endif