diff --git a/shell.nix b/shell.nix
index e2f9100..a6bed06 100644
--- a/shell.nix
+++ b/shell.nix
@@ -18,6 +18,7 @@ in
 mkShell {
   packages = [
     asciidoctorWrappedWithCustomOptions
+    bundix
     gems
     gems.wrappedRuby