diff --git a/pbbuilder.gemspec b/pbbuilder.gemspec
index 86ed91e..e834b42 100644
--- a/pbbuilder.gemspec
+++ b/pbbuilder.gemspec
@@ -14,7 +14,7 @@ Gem::Specification.new do |spec|
   spec.files = `git ls-files`.split("\n")
   spec.test_files = `git ls-files -- test/*`.split("\n")
 
-  spec.add_dependency "google-protobuf", "~> 3.25"
+  spec.add_dependency "google-protobuf", ">= 3.25", "< 5.0"
   spec.add_dependency "activesupport"
   spec.add_development_dependency 'm'
   spec.add_development_dependency "pry"