diff --git a/.travis.yml b/.travis.yml
index b730aaa8e7c65116da7c03734e802a2d8b455aa9..cb8b70de06b9c35f8d7759b565eb621c435549ca 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,6 @@
 language: java
 script:
   - set -e
-  - wget https://github.com/broadinstitute/cromwell/releases/download/31/womtool-31.jar
-  - for F in `find -name "*.wdl"`; do echo $F; java -jar womtool-31.jar validate $F; done
+  - export CROMWELL_VERSION=34
+  - wget https://github.com/broadinstitute/cromwell/releases/download/$CROMWELL_VERSION/womtool-$CROMWELL_VERSION.jar
+  - for F in $(git ls-files *.wdl); do echo $F; java -jar womtool-$CROMWELL_VERSION.jar validate $F; done