diff --git a/Dockerfile.base.alpine b/Dockerfile.base.alpine
index da1d7ae..ac1d93c 100644
--- a/Dockerfile.base.alpine
+++ b/Dockerfile.base.alpine
@@ -29,7 +29,7 @@
 
 # Install app dependencies
 RUN apk add build-base gcc abuild binutils python-dev libffi-dev openssl-dev git linux-headers && \
-    pip install cython enum34 six && \
+    pip install cython==0.24.1 enum34 six && \
     pip install -r /tmp/requirements.txt && \
     apk del --purge build-base gcc abuild binutils python-dev libffi-dev openssl-dev git linux-headers
 
diff --git a/compose/docker-compose-system-test.yml b/compose/docker-compose-system-test.yml
index 3ef7b03..ad23313 100644
--- a/compose/docker-compose-system-test.yml
+++ b/compose/docker-compose-system-test.yml
@@ -137,7 +137,7 @@
       "-v",
       "--consul=${DOCKER_HOST_IP}:8500",
       "--fluentd=fluentd:24224",
-      "--controller=localhost:6633",
+      "--controller=${DOCKER_HOST_IP}:6633",
       "--grpc-endpoint=@voltha-grpc",
       "--instance-id-is-container-name",
       "-v"
diff --git a/requirements.txt b/requirements.txt
index 6e785bd..389c862 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 argparse==1.2.1
 colorama>=0.2.5
-cython
+cython==0.24.1
 decorator>=3.4.0
 docker-py
 fluent-logger>=0.4.3