diff --git a/certs/Makefile b/certs/Makefile
index 3ccad6e2..35a50c81 100644
--- a/certs/Makefile
+++ b/certs/Makefile
@@ -13,7 +13,7 @@ DOMAINS_DUAL = \
 	dns.google/GTS-Root-R4 \
 	dns.quad9.net/DigiCert-Global-Root-G3 \
 	git.eworm.de/ISRG-Root-X2 \
-	lists.blocklist.de/Certum-Trusted-Network-CA \
+	lists.blocklist.de/GTS-Root-R4 \
 	matrix.org/GTS-Root-R4 \
 	raw.githubusercontent.com/USERTrust-RSA-Certification-Authority \
 	rsc.eworm.de/ISRG-Root-X2 \
diff --git a/global-config.rsc b/global-config.rsc
index 25254123..19787a8d 100644
--- a/global-config.rsc
+++ b/global-config.rsc
@@ -119,7 +119,7 @@
     { url="https://www.dshield.org/block.txt"; cidr="/24";
       cert="ISRG Root X1" };
     { url="https://lists.blocklist.de/lists/strongips.txt";
-      cert="Certum Trusted Network CA" };
+      cert="GTS Root R4" };
 #    { url="https://www.spamhaus.org/drop/drop_v4.json";
 #      cert="GTS Root R4" };
 #    { url="https://www.spamhaus.org/drop/drop_v6.json";