diff --git a/inspec-core.gemspec b/inspec-core.gemspec
index 9faa323b2..7bb02b449 100644
--- a/inspec-core.gemspec
+++ b/inspec-core.gemspec
@@ -27,7 +27,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency "license-acceptance", ">= 0.2.13", "< 2.0"
   spec.add_dependency "thor",               ">= 0.20", "< 2.0"
   spec.add_dependency "json_schemer",       "~> 0.2.1"
-  spec.add_dependency "method_source",      "~> 1.0"
+  spec.add_dependency "method_source",      ">= 0.8", "< 2.0"
   spec.add_dependency "rubyzip",            "~> 1.2", ">= 1.2.2"
   spec.add_dependency "rspec",              "~> 3.9"
   spec.add_dependency "rspec-its",          "~> 1.2"