diff --git a/tools/docker/Makefile b/tools/docker/Makefile
index c25f07881e..a8d5eb62c5 100644
--- a/tools/docker/Makefile
+++ b/tools/docker/Makefile
@@ -307,7 +307,7 @@ distclean_python: clean_python
 ##########################
 ##  MINIZINC CHALLENGE  ##
 ##########################
-MZN_TAG=or-tools-minizinc-challenge:2018v3
+MZN_TAG=or-tools-minizinc-challenge:2019v2
 
 minizinc-challenge-image:
 	docker build -f minizinc-challenge.Dockerfile -t $(MZN_TAG) .
diff --git a/tools/docker/minizinc-challenge.Dockerfile b/tools/docker/minizinc-challenge.Dockerfile
index c3cbd440f2..cf4fd21913 100644
--- a/tools/docker/minizinc-challenge.Dockerfile
+++ b/tools/docker/minizinc-challenge.Dockerfile
@@ -1,4 +1,4 @@
-FROM minizinc/mznc2018:1.0
+FROM minizinc/mznc2019:1.0
 
 ENV SRC_GIT_BRANCH master
 
@@ -15,9 +15,9 @@ RUN git clone -b "$SRC_GIT_BRANCH" --single-branch https://github.com/google/or-
 
 WORKDIR /root/or-tools
 
-RUN make -j 8 third_party
+RUN make -j 4 third_party
 
-RUN make -j 8 cc fz
+RUN make -j 4 cc fz
 
 RUN ln -s /root/or-tools/bin/fz /entry_data/fzn-exec