Use debian stretch, closes #91
diff --git a/2.1.2/Dockerfile b/2.1.2/Dockerfile
index 9520b6c..ed9cc38 100644
--- a/2.1.2/Dockerfile
+++ b/2.1.2/Dockerfile
@@ -10,7 +10,7 @@
# License for the specific language governing permissions and limitations under
# the License.
-FROM debian:jessie
+FROM debian:stretch
MAINTAINER CouchDB Developers dev@couchdb.apache.org
@@ -22,9 +22,11 @@
curl \
erlang-nox \
erlang-reltool \
- libicu52 \
+ libicu57 \
libmozjs185-1.0 \
openssl \
+ gpg \
+ dirmngr \
&& rm -rf /var/lib/apt/lists/*
# grab gosu for easy step-down from root and tini for signal handling