diff --git a/Dockerfile b/Dockerfile
index 047067600..1357f1361 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,15 @@
 FROM alpine:3.13
 
+RUN apk add curl
+RUN apk add openssl
+
 RUN apk add --no-cache ca-certificates && update-ca-certificates
 
 RUN curl --output /usr/local/share/ca-certificates/SectigoRSADomainValidationSecureServerCA.crt http://crt.sectigo.com/SectigoRSADomainValidationSecureServerCA.crt
 
+RUN openssl x509 -inform DER -in /usr/local/share/ca-certificates/SectigoRSADomainValidationSecureServerCA.crt -out /usr/local/share/ca-certificates/SectigoRSADomainValidationSecureServerCA.pem -text
+RUN update-ca-certificates
+
 COPY guardian .
 
 EXPOSE 8080