diff --git a/.rultor.yml b/.rultor.yml
index fd42209..f5a41c5 100644
--- a/.rultor.yml
+++ b/.rultor.yml
@@ -25,6 +25,8 @@ docker:
 install: |
   sudo npm install -g sass@1.77.1
   sudo gem install judges
+  sudo wget --no-verbose -O /usr/local/Saxon.jar \
+    https://repo.maven.apache.org/maven2/net/sf/saxon/Saxon-HE/9.8.0-5/Saxon-HE-9.8.0-5.jar
 merge:
   script: |-
     sudo docker build "$(pwd)"