diff --git a/python-dns.spec b/python-dns.spec
index 8358a4449ecb461a15f239ac0792f59f95f07aa4..583b28ec928d383996a3673dabcb966dc1a79edb 100644
--- a/python-dns.spec
+++ b/python-dns.spec
@@ -14,7 +14,7 @@ messages, names, and records.
 Name:           python-dns
 Summary:        %{sum}
 Version:        1.16.0
-Release:        3
+Release:        4
 License:        MIT
 URL:            http://www.dnspython.org/
 Source0: 	http://www.dnspython.org/kits/%{version}/dnspython-%{version}.tar.gz
@@ -23,9 +23,9 @@ BuildArch:      noarch
 Patch0:         unicode_label_escapify.patch
 Patch1:         collections_abc.patch
 Patch2:         base64.patch
-Patch3:         fix-failed-tests.patch 
+Patch3:         fix-failed-tests.patch
 
-BuildRequires:  python3-devel python3-setuptools python3-pycryptodome python3-ecdsa
+BuildRequires:  python3-devel python3-setuptools
 
 %description
 %{_description}
@@ -62,6 +62,9 @@ find examples -type f | xargs chmod a-x
 %doc examples
 
 %changelog
+* Thu Mar 03 2022 zhaoshuang<zhaoshuang@uniontech.com> - 1.16.0-4
+- remove unnecessary buildrequires
+
 * Tue Nov 17 2020 jinzhimin<jinzhimin2@huawei.com> - 1.16.0-3
 - fix tests failed