diff --git a/utils/ci.Dockerfile b/utils/ci.Dockerfile
index 30ddc7a..c9fc7b2 100644
--- a/utils/ci.Dockerfile
+++ b/utils/ci.Dockerfile
@@ -1,4 +1,14 @@
 FROM alpine
-    MAINTAINER Max Luebke <mluebke@uni-potsdam.de>
+
+LABEL maintainer="Max Luebke <mluebke@uni-potsdam.de"
 
 RUN apk add --no-cache build-base openmp cmake git eigen-dev
+
+RUN git clone https://github.com/doctest/doctest.git /doctest \
+    && cd /doctest \
+    && mkdir build \
+    && cd build \
+    && cmake .. \
+    && make install \
+    && cd / \
+    && rm -rf /doctest