diff --git a/.travis.yml b/.travis.yml
index 6e4308bd7..612ebf10d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -37,6 +37,9 @@ install:
     # Clone the Pulumi-wide repo so we can use its scripts.
     - git clone git@github.com:pulumi/home ${GOPATH}/src/github.com/pulumi/home
     - make ensure
+before_script:
+    # Ensure the working tree is clean (make ensure may have updated lock files)
+    - ${GOPATH}/src/github.com/pulumi/home/scripts/check-worktree-is-clean.sh
 script:
     - make travis_${TRAVIS_EVENT_TYPE} TEST_FAST_TIMEOUT=10m
 notifications:
diff --git a/Gopkg.lock b/Gopkg.lock
index 0a93a9155..5ea0138fe 100644
--- a/Gopkg.lock
+++ b/Gopkg.lock
@@ -243,6 +243,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "79bc7379ccff63e1fa7f1b601455b368368e26e44742350c82f2bf44adbdb733"
+  inputs-digest = "ac5550bbf6f0b4eb66c683d5ac3a605fc5ecf4b3055b0763122555230f5d4577"
   solver-name = "gps-cdcl"
   solver-version = 1