diff --git a/transport-site/Dockerfile b/transport-site/Dockerfile
index 5a94c37..beb4a61 100644
--- a/transport-site/Dockerfile
+++ b/transport-site/Dockerfile
@@ -1,12 +1,14 @@
 # see https://hub.docker.com/_/elixir
-FROM elixir:1.10.4-alpine
+FROM elixir:1.11.3-alpine
 
-RUN apk add nodejs-npm curl yarn bash build-base wget libtool
+RUN apk add nodejs-npm curl yarn bash build-base wget libtool git
 
 # Install app dependencies
 RUN mix local.hex --force
 RUN mix local.rebar --force
 
+# NOTE: development at https://git.savannah.gnu.org/gitweb/?p=libiconv.git
+# and publication at https://ftp.gnu.org/pub/gnu/libiconv
 RUN wget https://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.16.tar.gz
 RUN tar -xf libiconv-1.16.tar.gz
 RUN cd libiconv-1.16 && ./configure --prefix= && make && make install