diff --git a/manifest.xml b/manifest.xml
index bdb4e59..8ff3aaf 100644
--- a/manifest.xml
+++ b/manifest.xml
@@ -12,6 +12,7 @@
     <depend_optional package="gui/vega-rb" />
     <depend_optional package="data_processing/rb-gsl" />
     <depend_optional package="geoutm" />
+    <depend_optional package="data_processing/polars-ruby" />
 
     <test_depend package="minitest" />
     <test_depend package="flexmock" />