diff --git a/Dockerfile b/Dockerfile
index 83842db..6bc4fe6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,6 +12,10 @@ ENV DEVEL_KIT_MODULE_VERSION 0.3.0
 ENV LUAJIT_LIB=/usr/lib
 ENV LUAJIT_INC=/usr/include/luajit-2.0
 
+# resolves #166
+ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so php
+RUN apk add --no-cache --repository http://dl-3.alpinelinux.org/alpine/edge/testing gnu-libiconv
+
 RUN GPG_KEYS=B0F4253373F8F6F510D42178520A9993A1C052F8 \
   && CONFIG="\
     --prefix=/etc/nginx \
@@ -62,7 +66,7 @@ RUN GPG_KEYS=B0F4253373F8F6F510D42178520A9993A1C052F8 \
     --add-module=/usr/src/lua-nginx-module-$LUA_MODULE_VERSION \
   " \
   && addgroup -S nginx \
-  && adduser -D -S -h /var/cache/nginx -s /sbin/nologin -G nginx nginx \
+  && adduser -D -S -h /var/cache/nginx -s /sbin/nologin -G nginx nginx \ 
   && apk add --no-cache --virtual .build-deps \
     autoconf \
     gcc \
diff --git a/docs/versioning.md b/docs/versioning.md
index 53029d3..6631587 100644
--- a/docs/versioning.md
+++ b/docs/versioning.md
@@ -30,6 +30,7 @@ The latest tag will always follow the master branch in git. the other versions w
 | 1.2.5 | 1.2.5 |1.13.4 | 7.1.8 | 3.4 | 0.2.10 | 
 | 1.2.6 | 1.2.6 |1.13.4 | 7.1.8 | 3.4 | 0.2.11 | 
 | 1.3.0 | 1.3.0 |1.13.4 | 7.1.8 | 3.4 | 0.3.0 | 
+| 1.3.1 | 1.3.1 |1.13.4 | 7.1.8 | 3.4 | 0.3.1 | 
 
 These tags will be created as releases on GitHub and as tags in docker hub.