diff --git a/circle.yml b/circle.yml
index 424084c..455718c 100644
--- a/circle.yml
+++ b/circle.yml
@@ -1,7 +1,7 @@
 machine:
   pre:
-    # install docker 1.7.1
-    - sudo curl -L -o /usr/bin/docker 'https://s3-external-1.amazonaws.com/circle-downloads/docker-1.7.1-circleci'; sudo chmod 0755 /usr/bin/docker; true
+    # install docker 1.9.1
+    - sudo curl -L -o /usr/bin/docker 'https://s3-external-1.amazonaws.com/circle-downloads/docker-1.9.1-circleci'; sudo chmod 0755 /usr/bin/docker; true
   services:
     - docker