diff --git a/byacc-20210808.tgz b/byacc-20210808.tgz
new file mode 100644
index 0000000..168a837
Binary files /dev/null and b/byacc-20210808.tgz differ
diff --git a/byacc.spec b/byacc.spec
index 9b750f6..b58a3e2 100644
--- a/byacc.spec
+++ b/byacc.spec
@@ -1,10 +1,12 @@
+%define byaccdate 20210808
+
 Name:           byacc
-Version:        2.0.20210109
+Version:        2.0.%{byaccdate}
 Release:        1
 Summary:        A parser generator
 License:        public domain
 URL:            https://invisible-island.net/byacc/byacc.html
-Source0:        https://invisible-island.net/datafiles/release/byacc.tar.gz
+Source0:        https://invisible-island.net/datafiles/release/byacc-%{byaccdate}.tgz
 
 BuildRequires:  gcc
 
@@ -18,7 +20,7 @@ rejected.
 %package_help
 
 %prep
-%autosetup -n byacc-20210109 -p1
+%autosetup -n byacc-20210808 -p1
 find . -type f -name \*.c -print0 | xargs -0 sed -i 's/YYSTACKSIZE 500/YYSTACKSIZE 10000/g'
 
 %build
@@ -43,6 +45,9 @@ ln -s yacc.1 %{buildroot}%{_mandir}/man1/byacc.1
 %{_mandir}/man1/*
 
 %changelog
+* Sat Dec 25 2021 tianwei<tianwei12@huawei.com> - 2.0.20210808
+- DESC:upgrade to 2.0.20210808
+
 * Mon Feb 1 2021 wangjie<wangjie294@huawei.com> - 2.0.20210109
 - DESC:upgrade 2.0.20210109
 
diff --git a/byacc.tar.gz b/byacc.tar.gz
deleted file mode 100644
index 8c606da..0000000
Binary files a/byacc.tar.gz and /dev/null differ