diff --git a/bin/behat-cleanup.sh b/bin/behat-cleanup.sh
index 895a74e..0c7b955 100755
--- a/bin/behat-cleanup.sh
+++ b/bin/behat-cleanup.sh
@@ -4,7 +4,7 @@
 # Delete the Pantheon site environment after the Behat test suite has run.
 ###
 
-terminus auth whoami > /dev/null
+terminus auth:whoami > /dev/null
 if [ $? -ne 0 ]; then
 	echo "Terminus unauthenticated; assuming unauthenticated build"
 	exit 0
@@ -20,4 +20,4 @@ fi
 ###
 # Delete the environment used for this test run.
 ###
-yes | terminus site delete-env --remove-branch
+terminus multidev:delete $SITE_ENV --delete-branch --yes
diff --git a/bin/behat-prepare.sh b/bin/behat-prepare.sh
index a4dac3c..53ec35c 100755
--- a/bin/behat-prepare.sh
+++ b/bin/behat-prepare.sh
@@ -6,7 +6,7 @@
 # such that it can be run a second time if a step fails.
 ###
 
-terminus auth whoami > /dev/null
+terminus auth:whoami > /dev/null
 if [ $? -ne 0 ]; then
 	echo "Terminus unauthenticated; assuming unauthenticated build"
 	exit 0
@@ -22,13 +22,13 @@ fi
 ###
 # Create a new environment for this particular test run.
 ###
-terminus site create-env --to-env=$TERMINUS_ENV --from-env=dev
-yes | terminus site wipe
+terminus env:create $TERMINUS_SITE.dev $TERMINUS_ENV
+terminus env:wipe $SITE_ENV --yes
 
 ###
 # Get all necessary environment details.
 ###
-PANTHEON_GIT_URL=$(terminus site connection-info --field=git_url)
+PANTHEON_GIT_URL=$(terminus connection:info $SITE_ENV --field=git_url)
 PANTHEON_SITE_URL="$TERMINUS_ENV-$TERMINUS_SITE.pantheonsite.io"
 PREPARE_DIR="/tmp/$TERMINUS_ENV-$TERMINUS_SITE"
 BASH_DIR="$( cd -P "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
@@ -37,7 +37,7 @@ SIMPLESAMLPHP_VERSION='1.14.8'
 ###
 # Switch to git mode for pushing the files up
 ###
-terminus site set-connection-mode --mode=git
+terminus connection:set $SITE_ENV git
 rm -rf $PREPARE_DIR
 git clone -b $TERMINUS_ENV $PANTHEON_GIT_URL $PREPARE_DIR
 
@@ -128,7 +128,7 @@ sleep 10
 ###
 # Silence output so as not to show the password.
 {
-  terminus wp "core install --title=$TERMINUS_ENV-$TERMINUS_SITE --url=$PANTHEON_SITE_URL --admin_user=$WORDPRESS_ADMIN_USERNAME --admin_email=$WORDPRESS_ADMIN_EMAIL --admin_password=$WORDPRESS_ADMIN_PASSWORD"
+  terminus wp $SITE_ENV -- core install --title=$TERMINUS_ENV-$TERMINUS_SITE --url=$PANTHEON_SITE_URL --admin_user=$WORDPRESS_ADMIN_USERNAME --admin_email=$WORDPRESS_ADMIN_EMAIL --admin_password=$WORDPRESS_ADMIN_PASSWORD
 } &> /dev/null
-terminus wp "plugin activate wp-native-php-sessions wp-saml-auth"
-terminus wp "theme activate $TERMINUS_SITE"
+terminus wp $SITE_ENV -- plugin activate wp-native-php-sessions wp-saml-auth
+terminus wp $SITE_ENV -- theme activate $TERMINUS_SITE
diff --git a/bin/behat-test.sh b/bin/behat-test.sh
index e8c4f52..6931b0f 100755
--- a/bin/behat-test.sh
+++ b/bin/behat-test.sh
@@ -4,7 +4,7 @@
 # Execute the Behat test suite against a prepared Pantheon site environment.
 ###
 
-terminus auth whoami > /dev/null
+terminus auth:whoami > /dev/null
 if [ $? -ne 0 ]; then
 	echo "Terminus unauthenticated; assuming unauthenticated build"
 	exit 0
diff --git a/circle.yml b/circle.yml
index c512505..4f66f8a 100644
--- a/circle.yml
+++ b/circle.yml
@@ -5,6 +5,7 @@ machine:
   environment:
     TERMINUS_ENV: ci-$CIRCLE_BUILD_NUM
     TERMINUS_SITE: wp-saml-auth
+    SITE_ENV: $TERMINUS_SITE.$TERMINUS_ENV
     WORDPRESS_ADMIN_USERNAME: pantheon
     # A random password is set in the dependencies:pre stage as a text file.
     # This line reads the same file repeatedly. If the openssl call were used
@@ -12,6 +13,7 @@ machine:
     # line of other steps. Each CircleCI command runs in a separate shell.
     WORDPRESS_ADMIN_PASSWORD: $(cat ~/WORDPRESS_ADMIN_PASSWORD)
     WORDPRESS_ADMIN_EMAIL: no-reply@getpantheon.com
+    PATH: $PATH:~/terminus/bin
 
 dependencies:
   cache_directories:
@@ -38,9 +40,10 @@ dependencies:
         echo "TERMINUS_TOKEN environment variables missing; assuming unauthenticated build"
         exit 0
       fi
-      composer global require pantheon-systems/terminus ">=0.13.3 <0.99"
       composer install
-      terminus auth login --machine-token=$TERMINUS_TOKEN
+      git clone --branch master https://github.com/pantheon-systems/terminus.git ~/terminus
+      cd ~/terminus && composer install
+      terminus auth:login --machine-token=$TERMINUS_TOKEN
 
 test:
   pre: