diff --git a/byacc.spec b/byacc.spec
index 429a5c1..9b750f6 100644
--- a/byacc.spec
+++ b/byacc.spec
@@ -1,5 +1,5 @@
 Name:           byacc
-Version:        1.9.20200330
+Version:        2.0.20210109
 Release:        1
 Summary:        A parser generator
 License:        public domain
@@ -18,7 +18,7 @@ rejected.
 %package_help
 
 %prep
-%autosetup -n byacc-20200330 -p1
+%autosetup -n byacc-20210109 -p1
 find . -type f -name \*.c -print0 | xargs -0 sed -i 's/YYSTACKSIZE 500/YYSTACKSIZE 10000/g'
 
 %build
@@ -43,6 +43,9 @@ ln -s yacc.1 %{buildroot}%{_mandir}/man1/byacc.1
 %{_mandir}/man1/*
 
 %changelog
+* Mon Feb 1 2021 wangjie<wangjie294@huawei.com> - 2.0.20210109
+- DESC:upgrade 2.0.20210109
+
 * Sta Jul 25 2020 xinghe <xinghe1@huawei.com> - 1.9.20200330-1
 - update version to 1.9.20200330
 
diff --git a/byacc.tar.gz b/byacc.tar.gz
index f6dcd65..8c606da 100644
Binary files a/byacc.tar.gz and b/byacc.tar.gz differ