diff --git a/rebuild_src_rpm.sh b/rebuild_src_rpm.sh
index 07682b3..a7f5429 100755
--- a/rebuild_src_rpm.sh
+++ b/rebuild_src_rpm.sh
@@ -7,7 +7,7 @@ type -P docker >/dev/null && DOCKER=$(which docker)
 type -P podman >/dev/null && DOCKER=$(which podman)
 
 ICINGA2_VERSION=2.13.7
-ICINGA2_SPECSOURCE='https://git.icinga.com/packaging/rpm-icinga2/-/raw/master/icinga2.spec'
+ICINGA2_SPECSOURCE='https://archive.softwareheritage.org/browse/content/sha1_git:6ad9b69b021045c50ada3f1b19f746bbeb51d949/raw/?filename=icinga2.spec'
 ICINGA_SELINUX_COMMON_SOURCE='https://packages.icinga.com/fedora/36/release/src/icinga-selinux-common/icinga-selinux-common-1.0.0-1.fc36.icinga.src.rpm'
 
 ARCH=$(${DOCKER} run --rm docker.io/library/rockylinux:8 uname -i)
@@ -24,7 +24,7 @@ useradd -m dontbuildasroot -s /bin/bash
 runuser -l dontbuildasroot -c 'mkdir -p ~/rpmbuild/{BUILD,RPMS,SOURCES,SPECS,SRPMS}'
 runuser -l dontbuildasroot -c 'rpm2cpio ${ICINGA_SELINUX_COMMON_SOURCE} | cpio -idmvD ~/rpmbuild/SPECS/'
 runuser -l dontbuildasroot -c 'curl -sSL -o ~/rpmbuild/SPECS/icinga2.spec ${ICINGA2_SPECSOURCE}'
-runuser -l dontbuildasroot -c 'sed -i "s|Version:        2.11.4|Version:        ${ICINGA2_VERSION}|g" ~/rpmbuild/SPECS/icinga2.spec'
+runuser -l dontbuildasroot -c 'sed -i "s|Version:        2.13.5|Version:        ${ICINGA2_VERSION}|g" ~/rpmbuild/SPECS/icinga2.spec'
 runuser -l dontbuildasroot -c 'spectool -g -R ~/rpmbuild/SPECS/icinga2.spec'
 runuser -l dontbuildasroot -c 'rpmbuild -ba ~/rpmbuild/SPECS/icinga-selinux-common.spec'
 runuser -l dontbuildasroot -c 'rpmbuild -ba ~/rpmbuild/SPECS/icinga2.spec'