diff --git a/util/manibuilder/Dockerfile.alpine b/util/manibuilder/Dockerfile.alpine
index 7f738e1..09a3d6a 100644
--- a/util/manibuilder/Dockerfile.alpine
+++ b/util/manibuilder/Dockerfile.alpine
@@ -1,12 +1,16 @@
 FROM manibase
 
-ARG PROTO=https
+COPY isrgrootx1.pem /etc/ssl/cert.pem
+
 RUN \
 	adduser -D mani mani && \
-	sed -i "s/https/${PROTO}/" /etc/apk/repositories && \
 	apk update && \
-	apk add ca-certificates build-base linux-headers git ccache \
+	apk add build-base linux-headers git ccache \
 		pciutils-dev libusb-compat-dev libusb-dev
+	if [ ! -h /etc/ssl/cert.pem ]; then \
+		rm -f /etc/ssl/certs/*; \
+		ln -sf /etc/ssl/cert.pem /etc/ssl/certs/ca-certificates.crt; \
+	fi
 
 RUN apk add libgpiod-dev || true
 
diff --git a/util/manibuilder/Makefile b/util/manibuilder/Makefile
index 60332c0..a30d08d 100644
--- a/util/manibuilder/Makefile
+++ b/util/manibuilder/Makefile
@@ -27,9 +27,6 @@
 $(foreach tag,$(MULTIARCH_TAGS), \
 	$(eval $(call build_template,$(tag),multiarch)))
 
-$(addsuffix -build,$(filter alpine%v3.7 alpine%v3.8,$(MULTIARCH_TAGS))): \
-	DOCKER_BUILD_ARGS = --build-arg PROTO=http
-
 djgpp\:6.1.0-build: %-build: Dockerfile.djgpp mani-wrapper.sh
 	$(QUIET_SETUP)docker build . -f $< -t mani/$*
 
diff --git a/util/manibuilder/isrgrootx1.pem b/util/manibuilder/isrgrootx1.pem
new file mode 100644
index 0000000..b85c803
--- /dev/null
+++ b/util/manibuilder/isrgrootx1.pem
@@ -0,0 +1,31 @@
+-----BEGIN CERTIFICATE-----
+MIIFazCCA1OgAwIBAgIRAIIQz7DSQONZRGPgu2OCiwAwDQYJKoZIhvcNAQELBQAw
+TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh
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+emyPxgcYxn/eR44/KJ4EBs+lVDR3veyJm+kXQ99b21/+jh5Xos1AnX5iItreGCc=
+-----END CERTIFICATE-----