diff --git a/pubspec.yaml b/pubspec.yaml
index 045846476..5dc21a1ed 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -42,7 +42,7 @@ dev_dependencies:
   archive: ^3.1.2
   crypto: ^3.0.0
   dart_style: ^2.0.0
-  dartdoc: ^6.0.0
+  dartdoc: ">=6.0.0 <8.0.0"
   grinder: ^0.9.0
   node_preamble: ^2.0.2
   lints: ^2.0.0