diff --git a/.travis.yml b/.travis.yml
index 59e16ce..8777fe2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,14 +4,18 @@ go:
   - 1.3
   - 1.4
 
+env:
+  - LIBWEBP_VERSION="0.4.1"
+  - LIBWEBP_VERSION="0.4.2"
+
 before_install:
   - sudo apt-get update -qq
   - sudo apt-get install -qq libjpeg-dev libpng-dev libtiff-dev libgif-dev
   - > 
       cd /tmp
-      && wget http://downloads.webmproject.org/releases/webp/libwebp-0.4.2.tar.gz
-      && tar xf libwebp-0.4.2.tar.gz
-      && cd libwebp-0.4.2
+      && wget http://downloads.webmproject.org/releases/webp/libwebp-${LIBWEBP_VERSION}.tar.gz
+      && tar xf libwebp-${LIBWEBP_VERSION}.tar.gz
+      && cd libwebp-${LIBWEBP_VERSION}
       && ./configure
       && make
       && sudo make install