diff --git a/resources/com/cadoles/tamarin/Dockerfile b/resources/com/cadoles/tamarin/Dockerfile
index afb04be..5a36a00 100644
--- a/resources/com/cadoles/tamarin/Dockerfile
+++ b/resources/com/cadoles/tamarin/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.8
+FROM alpine:3.12
 
 ARG HTTP_PROXY=
 ARG HTTPS_PROXY=
@@ -7,7 +7,20 @@ ARG https_proxy=
 
 ARG TAMARIN_VERSION=develop
 
-RUN apk add --no-cache git docker python3 bash
+RUN apk add --no-cache git docker python3 bash openssl
+
+ADD https://letsencrypt.org/certs/isrgrootx1.pem.txt /usr/local/share/ca-certificates/isrgrootx1.pem
+ADD https://letsencrypt.org/certs/isrg-root-x2.pem  /usr/local/share/ca-certificates/isrg-root-x2.pem
+ADD https://letsencrypt.org/certs/trustid-x3-root.pem.txt /usr/local/share/ca-certificates/trustid-x3-root.pem
+ADD https://letsencrypt.org/certs/letsencryptauthorityx3.pem /usr/local/share/ca-certificates/letsencryptauthorityx3.pem 
+
+RUN cd /usr/local/share/ca-certificates \
+ && openssl x509 -in isrgrootx1.pem -inform PEM -out isrgrootx1.crt \
+ && openssl x509 -in trustid-x3-root.pem -inform PEM -out trustid-x3-root.crt \
+ && openssl x509 -in letsencryptauthorityx3.pem -inform PEM -out letsencryptauthorityx3.crt \
+ && openssl x509 -in isrg-root-x2.pem -inform PEM -out isrg-root-x2.crt
+
+RUN update-ca-certificates  
 
 RUN git clone http://forge.cadoles.com/Cadoles/Tamarin /tamarin\
   && cd /tamarin\
@@ -23,4 +36,4 @@ VOLUME /dist
 ADD run-tamarin.sh /usr/local/bin/run-tamarin
 RUN chmod +x /usr/local/bin/run-tamarin
 
-CMD /usr/local/bin/run-tamarin
\ No newline at end of file
+CMD /usr/local/bin/run-tamarin