diff --git a/packwerk.gemspec b/packwerk.gemspec
index 27cc762ba..6698a6585 100644
--- a/packwerk.gemspec
+++ b/packwerk.gemspec
@@ -50,7 +50,7 @@ Gem::Specification.new do |spec|
   # For Ruby parsing
   spec.add_dependency("ast")
   spec.add_dependency("parser")
-  spec.add_dependency("prism")
+  spec.add_dependency("prism", ">= 0.20.0")
 
   # For ERB parsing
   spec.add_dependency("better_html")