diff --git a/certs/Makefile b/certs/Makefile
index 870cb542..39627e5f 100644
--- a/certs/Makefile
+++ b/certs/Makefile
@@ -12,9 +12,9 @@ DOMAINS = \
 	dns.quad9.net/DigiCert-Global-Root-G3 \
 	feodotracker.abuse.ch/GlobalSign \
 	git.eworm.de/ISRG-Root-X2 \
+	github.com/USERTrust-ECC-Certification-Authority \
 	ipv4.showipv6.de/ISRG-Root-X1 \
 	ipv4.tunnelbroker.net/Starfield-Root-Certificate-Authority-G2 \
-	ipv6.showipv6.de/ISRG-Root-X1 \
 	lists.blocklist.de/Certum-Trusted-Network-CA \
 	matrix.org/GTS-Root-R4 \
 	mkcert.org/ISRG-Root-X1 \
@@ -24,9 +24,12 @@ DOMAINS = \
 	www.dshield.org/ISRG-Root-X1 \
 	www.spamhaus.org/GTS-Root-R4
 
-.PHONY: $(DOMAINS)
+DOMAINSIPV6 = \
+	ipv6.showipv6.de/ISRG-Root-X1
 
-all: $(DOMAINS)
+.PHONY: $(DOMAINS) $(DOMAINSIPV6)
 
-$(DOMAINS):
+all: $(DOMAINS) $(DOMAINSIPV6)
+
+$(DOMAINS) $(DOMAINSIPV6) :
 	curl --output /dev/null --silent --connect-timeout 5 --cacert $(notdir $@).pem https://$(dir $@)
diff --git a/certs/USERTrust-ECC-Certification-Authority.pem b/certs/USERTrust-ECC-Certification-Authority.pem
new file mode 100644
index 00000000..8c9cecd5
--- /dev/null
+++ b/certs/USERTrust-ECC-Certification-Authority.pem
@@ -0,0 +1,16 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----