diff --git a/README.markdown b/README.markdown
index 03dfca9b..9ee67e37 100644
--- a/README.markdown
+++ b/README.markdown
@@ -21,6 +21,10 @@ Add the gem to your Gemfile
 
     gem 'scout_apm'
 
+Add [a version of the `parser` gem that supports your version of Ruby](https://github.com/whitequark/parser?tab=readme-ov-file#backwards-compatibility). For example, if you're on Ruby 3.3.0:
+
+    gem 'parser', '~> 3.3.0.0'
+
 Update your Gemfile
 
     bundle install
diff --git a/scout_apm.gemspec b/scout_apm.gemspec
index 07e3faea..882651a9 100644
--- a/scout_apm.gemspec
+++ b/scout_apm.gemspec
@@ -28,7 +28,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "rake-compiler"
   s.add_development_dependency "addressable"
   s.add_development_dependency "activesupport"
-  s.add_runtime_dependency "parser", Gem::Version.new(RUBY_VERSION).approximate_recommendation
+  s.add_runtime_dependency "parser"
 
   # These are general development dependencies which are used in instrumentation
   # tests. Specific versions are pulled in using specific gemfiles, e.g.