diff --git a/dnf-plugin-spacewalk.spec b/dnf-plugin-spacewalk.spec
index e20e59f..24a5b5d 100644
--- a/dnf-plugin-spacewalk.spec
+++ b/dnf-plugin-spacewalk.spec
@@ -12,7 +12,7 @@
 Summary: DNF plugin for Spacewalk
 Name: dnf-plugin-spacewalk
 Version: 2.8.5
-Release: 7%{?dist}
+Release: 8%{?dist}
 License: GPLv2
 Source0: https://github.com/spacewalkproject/spacewalk/archive/%{name}-%{version}.tar.gz
 URL:     https://github.com/spacewalkproject/spacewalk
@@ -24,9 +24,11 @@ Requires: dnf-plugins-core
 Requires: librepo >= 1.7.15
 %if 0%{?fedora}
 Obsoletes: yum-rhn-plugin < 2.7
+Requires: dnf >= 4.0.9
 %endif
 %if 0%{?rhel} >= 8
 Provides: yum-rhn-plugin = %{version}
+Requires: dnf >= 4.0.9
 %endif
 
 %description
@@ -111,6 +113,9 @@ install -m 644 actions/errata.py %{buildroot}%{python3_sitelib}/rhn/actions/
 %endif
 
 %changelog
+* Mon Dec 10 2018 Michael Mraka <michael.mraka@redhat.com> 2.8.5-8
+- Resolves: #1637980 - use new api for http headers (michael.mraka@redhat.com)
+
 * Wed Oct 31 2018 Tomas Kasparek <tkasparek@redhat.com> 2.8.5-7
 - Resolves: rhbz#1633298 - librepo dependency is not added automatically (michael.mraka@redhat.com)
 
diff --git a/spacewalk.py b/spacewalk.py
index e0b418b..61bc5d8 100644
--- a/spacewalk.py
+++ b/spacewalk.py
@@ -242,11 +242,11 @@ class  SpacewalkRepo(dnf.repo.Repo):
         else:
             self.disable()
 
-        if hasattr(self, '_repo'):
-            # dnf > 3.6.0
+        if hasattr(self, 'set_http_headers'):
+            # dnf > 4.0.9  on RHEL 8, Fedora 29/30
             http_headers = self.create_http_headers()
             if http_headers:
-                self._repo.setHttpHeaders(http_headers)
+                self.set_http_headers(http_headers)
 
     def create_http_headers(self):
         http_headers = []