diff --git a/.travis.yml b/.travis.yml
index 3af7f48..248ac25 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,9 @@
+dist: xenial
 language: python
 python:
   - "2.7"
-  - "3.3"
-  - "3.4"
-  - "3.5"
   - "3.6"
+  - "3.7"
 # command to install dependencies
 install:
  - "pip install nose"
diff --git a/lambda_packages/__init__.py b/lambda_packages/__init__.py
index 525d2c2..bc3ece1 100644
--- a/lambda_packages/__init__.py
+++ b/lambda_packages/__init__.py
@@ -18,12 +18,16 @@
     },
     'cryptography': {
         'python2.7': {
-            'version': '2.3.1',
-            'path': os.path.join(PACKAGES_DIR, 'cryptography', 'python2.7-cryptography-2.3.1.tar.gz')
+            'version': '2.6.1',
+            'path': os.path.join(PACKAGES_DIR, 'cryptography', 'python2.7-cryptography-2.6.1.tar.gz')
         },
         'python3.6': {
-            'version': '2.3.1',
-            'path': os.path.join(PACKAGES_DIR, 'cryptography', 'python3.6-cryptography-2.3.1.tar.gz')
+            'version': '2.6.1',
+            'path': os.path.join(PACKAGES_DIR, 'cryptography', 'python3.6-cryptography-2.6.1.tar.gz')
+        },
+        'python3.7': {
+            'version': '2.6.1',
+            'path': os.path.join(PACKAGES_DIR, 'cryptography', 'python3.7-cryptography-2.6.1.tar.gz')
         }
     },
     'cv2': {
diff --git a/lambda_packages/cryptography/README.md b/lambda_packages/cryptography/README.md
index 0e39c6d..2bd561f 100644
--- a/lambda_packages/cryptography/README.md
+++ b/lambda_packages/cryptography/README.md
@@ -2,11 +2,12 @@
 
 On an machine with Amazon Linux:
 
-`./build.sh cryptography 2.3.1`
+`./build.sh cryptography <package version>`
 
 On a machine with docker and access to lambci images:
 
 ```
-docker run --rm -v `pwd`:/app lambci/lambda:build-python2.7 bash -c "cd /app && /app/build.sh --docker --py2-only cryptography 2.3.1"
-docker run --rm -v `pwd`:/app lambci/lambda:build-python3.6 bash -c "cd /app && /app/build.sh --docker --py3-only cryptography 2.3.1"
+docker run --rm -v `pwd`:/app lambci/lambda:build-python2.7 bash -c "cd /app && /app/build.sh --docker --py2.7-only cryptography <package version>"
+docker run --rm -v `pwd`:/app lambci/lambda:build-python3.6 bash -c "cd /app && /app/build.sh --docker --py3.6-only cryptography <package version>"
+docker run --rm -v `pwd`:/app lambci/lambda:build-python3.7 bash -c "cd /app && /app/build.sh --docker --py3.7-only cryptography <package version>"
 ```
diff --git a/lambda_packages/cryptography/build.sh b/lambda_packages/cryptography/build.sh
index 27e15c2..aaa369d 100755
--- a/lambda_packages/cryptography/build.sh
+++ b/lambda_packages/cryptography/build.sh
@@ -8,14 +8,15 @@
 # with --docker (you need docker installed and network access to reach lambci's
 # docker-lambda image).
 #
-# Defaults to building both python2.7 and python3.6 packages. If you only want
-# one of them use either --py2-only or --py3-only.
+# Defaults to building python2.7, python3.6 and python 3.7 packages. If you only want
+# one of them use --py2.7-only or --py3.6-only or --py3.7-only.
 #
 set -e
 
 DOCKER=0
-PY2=1
-PY3=1
+PY27=1
+PY36=1
+PY37=1
 SUDO=sudo
 
 while [[ $# -gt 2 ]]
@@ -28,14 +29,22 @@ case $key in
         SUDO=""
         shift
         ;;
-    --py2-only)
-        PY2=1
-        PY3=0
+    --py2.7-only)
+        PY27=1
+        PY36=0
+        PY37=0
         shift
         ;;
-    --py3-only)
-        PY2=0
-        PY3=1
+    --py3.6-only)
+        PY27=0
+        PY36=1
+        PY37=0
+        shift
+        ;;
+    --py3.7-only)
+        PY27=0
+        PY36=0
+        PY37=1
         shift
         ;;
     *)
@@ -48,8 +57,9 @@ PACKAGE=${1}
 VERSION=${2}
 
 echo DOCKER          = "${DOCKER}"
-echo PY2             = "${PY2}"
-echo PY3             = "${PY3}"
+echo PY27            = "${PY27}"
+echo PY36            = "${PY36}"
+echo PY37            = "${PY37}"
 echo PACKAGE         = "${PACKAGE}"
 echo VERSION         = "${VERSION}"
 
@@ -73,6 +83,8 @@ function build_package {
     if [ "${VIRTUALENV}" == "virtualenv" ]; then
         ${SUDO} ${PIP} install virtualenv
     fi
+
+    echo `${PYTHON} --version`
     
     echo "make virtualenv"
     ENV="env-${PYTHON}-${PACKAGE}-${VERSION}"
@@ -98,10 +110,14 @@ function build_package {
     rm -r ${TMP_DIR}
 }
 
-if [ ${PY2} == 1 ]; then
+if [ ${PY27} == 1 ]; then
     build_package ${PACKAGE} ${VERSION} python2.7 pip virtualenv
 fi
 
-if [ ${PY3} == 1 ]; then
+if [ ${PY36} == 1 ]; then
     build_package ${PACKAGE} ${VERSION} python3.6 pip3.6 "python3.6 -m venv "
 fi
+
+if [ ${PY37} == 1 ]; then
+    build_package ${PACKAGE} ${VERSION} python3.7 pip3.7 "python3.7 -m venv "
+fi
diff --git a/lambda_packages/cryptography/python2.7-cryptography-2.3.1.tar.gz b/lambda_packages/cryptography/python2.7-cryptography-2.3.1.tar.gz
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