diff --git a/.travis.yml b/.travis.yml
index 9d26c9fc22..aabc1ee35e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,7 +9,7 @@ cache:
   directories:
   - node_modules
 before_script:
-- npm install -g bower gulp-cli@1
+- npm install -g gulp-cli@1
 - gulp lint-eslint
 # TODO(dfreedm): re-enable after making update-types work
 #- >-
@@ -17,7 +17,7 @@ before_script:
 #  '\n\033[31mERROR:\033[0m Typings are stale. Please run "npm run
 #  update-types".' && false)
 script:
-- wct -l chrome -l firefox
+- wct --npm --module-resolution=node -l chrome -l firefox
 - if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then travis_wait 30 ./util/travis-sauce-test.sh; fi
 env:
   global:
diff --git a/util/travis-sauce-test.sh b/util/travis-sauce-test.sh
index 7d760f075b..fa6c59fb86 100755
--- a/util/travis-sauce-test.sh
+++ b/util/travis-sauce-test.sh
@@ -9,4 +9,4 @@
 # subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 #
 set -x
-wct -s 'windows 10/microsoftedge@14' -s 'windows 10/microsoftedge@15' -s 'windows 10/microsoftedge@16' -s 'windows 8.1/internet explorer@11' -s 'os x 10.11/safari@9' -s 'macos 10.12/safari@10' -s 'macos 10.13/safari@11' -s 'Linux/chrome@41'
\ No newline at end of file
+wct --npm --module-resolution=node -s 'windows 10/microsoftedge@14' -s 'windows 10/microsoftedge@15' -s 'windows 10/microsoftedge@16' -s 'windows 8.1/internet explorer@11' -s 'os x 10.11/safari@9' -s 'macos 10.12/safari@10' -s 'macos 10.13/safari@11' -s 'Linux/chrome@41'
\ No newline at end of file