diff --git a/.travis.yml b/.travis.yml
index 4a7558bc..9798b816 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,7 @@ language: java
 dist: bionic
 
 before-install:
+    - sudo apt-get update
     - sudo apt-get install -y xmlstarlet ant ant-optional
 
 install: