thodg/libgit2

diff --git a/ci/docker/bionic b/ci/docker/bionic
index 5918584..9ecb5da 100644
--- a/ci/docker/bionic
+++ b/ci/docker/bionic
@@ -6,7 +6,9 @@ RUN apt-get update && \
         curl \
         gcc \
         git \
+        krb5-user \
         libcurl4-openssl-dev \
+        libkrb5-dev \
         libpcre3-dev \
         libssh2-1-dev \
         libssl-dev \