diff --git a/b4.spec b/b4.spec
index 87d792e..75d69f7 100644
--- a/b4.spec
+++ b/b4.spec
@@ -29,8 +29,9 @@ Source0:        %{name}-%{version}.tar.xz
 BuildArch:      noarch
 BuildRequires:  %{python_module requests}
 BuildRequires:  %{python_module setuptools}
-BuildRequires:  tar
-Requires:       python3-requests
+Requires:       python3-dkimpy >= 1.0.5
+Requires:       python3-dnspython >= 2.0.0
+Requires:       python3-requests >= 2.24.0
 
 %description
 This is a helper utility to work with patches made available via a