diff --git a/Dockerfile b/Dockerfile
index 4c6deb3..78a65f0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,17 +1,17 @@
-FROM python:3.6.6
+FROM python:3.7.3
 
-RUN curl -sL https://deb.nodesource.com/setup_8.x | bash -
+RUN curl -sL https://deb.nodesource.com/setup_10.x | bash -
 RUN apt-get install -y \
     groff \
     nodejs
 
 RUN mkdir /root/.aws
 
-RUN curl -s https://bootstrap.pypa.io/get-pip.py | python
 RUN pip install \
     awscli \
     pep8 \
     pipenv \
+    poetry \
     pytest \
     pytest-cov \
     pytest-mock \
@@ -25,11 +25,5 @@ RUN npm install -g \
 ARG YARN_VERSION
 RUN curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version ${YARN_VERSION}
 
-RUN echo "alias ll='ls -alFh --color=auto'" >> /root/.bashrc
-RUN echo "alias l='ls -alFh --color=auto'" >> /root/.bashrc
-
-# assuming that your serverless python libs live here
-RUN echo "export PYTHONPATH=/code/serverless/lib" >> /root/.bashrc
-
 RUN mkdir /code
 WORKDIR /code
diff --git a/Makefile b/Makefile
index e8e080e..5d092ad 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 NAME = verypossible/serverless
 SERVERLESS_VERSION = 1.35.1
-YARN_VERSION = 1.12.3
+YARN_VERSION = 1.15.2
 
 .PHONY:	all py3 shell
 
diff --git a/hooks/build b/hooks/build
index 3d44057..87d5ac0 100755
--- a/hooks/build
+++ b/hooks/build
@@ -7,6 +7,6 @@ echo "Using $DOCKERFILE for build"
 
 docker build \
         --build-arg SERVERLESS_VERSION=1.35.1 \
-        --build-arg YARN_VERSION=1.12.3 \
+        --build-arg YARN_VERSION=1.15.2 \
         -f $DOCKERFILE \
         -t $IMAGE_NAME .