diff --git a/lib/jars/.mvn/extensions.xml b/lib/jars/.mvn/extensions.xml
new file mode 100644
index 0000000..40d8e87
--- /dev/null
+++ b/lib/jars/.mvn/extensions.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<extensions>
+  <extension>
+    <groupId>io.takari.polyglot</groupId>
+    <artifactId>polyglot-ruby</artifactId>
+    <version>0.1.18</version>
+  </extension>
+</extensions>