1 files changed, 3 insertions, 4 deletions
diff --git a/Makefile b/Makefile
index afc5c71..fa830c4 100644
--- a/Makefile
+++ b/Makefile
@@ -13,13 +13,12 @@ $(MANUAL_FILES): $(BUILDDIR)/%: $(BUILDDIR)/%.md
 
 # used for validation, see https://letsencrypt.org/certificates/
 $(BUILDDIR)/certs/ca-certificates.crt: \
-        certs/letsencryptauthorityx[34].pem \
-        certs/lets-encrypt-x[34]-cross-signed.pem \
+        certs/isrgrootx1.pem \
+        certs/isrg-root-x2.pem \
         certs/lets-encrypt-r[34].pem \
-        certs/lets-encrypt-r[34]-cross-signed.pem \
         certs/lets-encrypt-e[12].pem
 	mkdir -pv -- $(BUILDDIR)/certs
-	cat $^ >$@
+	cat -- $^ >$@
 
 prefix ?= $(DESTDIR)
 exec_prefix ?= $(prefix)