diff --git a/.travis.yml b/.travis.yml
index 75f1d83..b9b8bf4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,7 @@ compiler: gcc
 branches:
   only:
     - master
+    - "/^[0-9]+\\.[0-9]+\\.[0-9]+/"
 
 cache:
   - apt
@@ -30,8 +31,8 @@ before_install:
         g++-mingw-w64-x86-64 \
         g++-mingw-w64-i686 \
         npm
-      npm config set strict-ssl false  # XXX: workaround for CERT_UNTRUSTED error in npm
-      npm install json
+      sudo npm config set strict-ssl false  # XXX: workaround for CERT_UNTRUSTED error in npm
+      sudo npm install -g json
     fi
 
 script: