diff --git a/resources/com/cadoles/tamarin/Dockerfile b/resources/com/cadoles/tamarin/Dockerfile
index ef78181..0fb6ad5 100644
--- a/resources/com/cadoles/tamarin/Dockerfile
+++ b/resources/com/cadoles/tamarin/Dockerfile
@@ -7,10 +7,9 @@ ARG https_proxy=
 
 ARG TAMARIN_VERSION=develop
 
-RUN apk add --no-cache git docker python3 bash openssl
+RUN apk add --no-cache git docker python3 bash openssl curl
 
-COPY add-letsencrypt-ca.sh /usr/local/bin/add-letsencrypt-ca
-RUN chmod +x /usr/local/bin/add-letsencrypt-ca && /usr/local/bin/add-letsencrypt-ca
+RUN curl -k https://forge.cadoles.com/Cadoles/Jenkins/raw/branch/master/resources/com/cadoles/common/add-letsencrypt-ca.sh | bash
 
 RUN git clone http://forge.cadoles.com/Cadoles/Tamarin /tamarin\
   && cd /tamarin\