diff --git a/Dockerfile b/Dockerfile
index f7ce6ee..c47849e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,6 +11,7 @@ RUN curl -s https://bootstrap.pypa.io/get-pip.py | python
 RUN pip install \
     awscli \
     pep8 \
+    pipenv \
     pytest \
     pytest-cov \
     pytest-mock \
diff --git a/Dockerfile-python3 b/Dockerfile-python3
index 2b9bb8b..8579a62 100644
--- a/Dockerfile-python3
+++ b/Dockerfile-python3
@@ -11,6 +11,7 @@ RUN curl -s https://bootstrap.pypa.io/get-pip.py | python
 RUN pip install \
     awscli \
     pep8 \
+    pipenv \
     pytest \
     pytest-cov \
     pytest-mock \
diff --git a/Makefile b/Makefile
index 9c74607..ee36c80 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 NAME = verypossible/serverless
-VERSION = 1.21.0
+VERSION = 1.22.0
 
 .PHONY:	all py2 py3 shell
 
diff --git a/README.md b/README.md
index edb335f..fa50824 100644
--- a/README.md
+++ b/README.md
@@ -5,10 +5,14 @@ Automated Docker build for the Serverless framework
 There are two `Dockerfile`s which are nearly the same.  One uses Python 2 base image and the other
 Python 3.
 
-These images are build from Docker Cloud.  The Serverless version to build is specified as a build
+These images are built in Docker Cloud.  The Serverless version to build is specified as a build
 `ARG` (build argument) which is set using `--build-arg` during the `docker build` command.  To pass
 this argument, we need a Docker Cloud build hook which resides in `hooks/build`. 
 
+In order to bump the Serverless version, the only real requirement is to change the version in the
+`hooks/build` file.  The `Makefile` also has references to the Serverless version, but this is
+really for testing the build locally.
+
 See the following for more information on Docker Cloud build hooks:
 
 https://docs.docker.com/docker-cloud/builds/advanced/#source-repository--branch-clones
diff --git a/hooks/build b/hooks/build
index 6f6ac62..c827ca8 100644
--- a/hooks/build
+++ b/hooks/build
@@ -10,6 +10,6 @@ fi
 echo "Using $DOCKERFILE for build"
 
 docker build \
-        --build-arg SERVERLESS_VERSION=1.21.0 \
+        --build-arg SERVERLESS_VERSION=1.22.0 \
         -f $DOCKERFILE \
         -t $IMAGE_NAME .