diff --git a/lambda_packages/__init__.py b/lambda_packages/__init__.py
index 525d2c2..7ed50b7 100644
--- a/lambda_packages/__init__.py
+++ b/lambda_packages/__init__.py
@@ -18,12 +18,12 @@
     },
     'cryptography': {
         'python2.7': {
-            'version': '2.3.1',
-            'path': os.path.join(PACKAGES_DIR, 'cryptography', 'python2.7-cryptography-2.3.1.tar.gz')
+            'version': '2.7',
+            'path': os.path.join(PACKAGES_DIR, 'cryptography', 'python2.7-cryptography-2.7.tar.gz')
         },
         'python3.6': {
-            'version': '2.3.1',
-            'path': os.path.join(PACKAGES_DIR, 'cryptography', 'python3.6-cryptography-2.3.1.tar.gz')
+            'version': '2.7',
+            'path': os.path.join(PACKAGES_DIR, 'cryptography', 'python3.6-cryptography-2.7.tar.gz')
         }
     },
     'cv2': {
diff --git a/lambda_packages/cryptography/build.sh b/lambda_packages/cryptography/build.sh
index 27e15c2..ab41ca2 100755
--- a/lambda_packages/cryptography/build.sh
+++ b/lambda_packages/cryptography/build.sh
@@ -70,17 +70,12 @@ function build_package {
     ${SUDO} yum update -y
     ${SUDO} yum groupinstall -y "Development Tools"
     ${SUDO} yum install -y libffi libffi-devel openssl openssl-devel
-    if [ "${VIRTUALENV}" == "virtualenv" ]; then
-        ${SUDO} ${PIP} install virtualenv
-    fi
-    
-    echo "make virtualenv"
+
     ENV="env-${PYTHON}-${PACKAGE}-${VERSION}"
-    echo ${VIRTUALENV} "${ENV}"
-    ${VIRTUALENV} "${ENV}"
+    echo "make ${ENV}"
+    virtualenv "${ENV}" --python=${PYTHON}
 
     echo "activate env in `pwd`"
-    echo source "${ENV}/bin/activate"
     source "${ENV}/bin/activate"
 
     # https://github.com/pypa/pip/issues/3056
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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diff --git a/lambda_packages/cryptography/python2.7-cryptography-2.7.tar.gz b/lambda_packages/cryptography/python2.7-cryptography-2.7.tar.gz
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diff --git a/lambda_packages/cryptography/python3.6-cryptography-2.3.1.tar.gz b/lambda_packages/cryptography/python3.6-cryptography-2.3.1.tar.gz
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index e8b5667..0000000
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diff --git a/lambda_packages/cryptography/python3.6-cryptography-2.7.tar.gz b/lambda_packages/cryptography/python3.6-cryptography-2.7.tar.gz
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