diff --git a/.travis.yml b/.travis.yml
index a2509cb8..ca29eff5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,9 @@ before_install:
   - sudo apt-get install -q libmapnik-dev
   - createdb template_postgis
   - psql -c "CREATE EXTENSION postgis" template_postgis
+  # Tell npm to use known registrars:
+  # see http://blog.npmjs.org/post/78085451721/npms-self-signed-certificate-is-no-more
+  - npm config set ca ""
 
 env:
   - NPROCS=1 JOBS=1