diff --git a/inspec-core.gemspec b/inspec-core.gemspec
index e1838d7e0e..fa9a6aa9b5 100644
--- a/inspec-core.gemspec
+++ b/inspec-core.gemspec
@@ -40,7 +40,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency "tty-prompt",         "~> 0.17"
   spec.add_dependency "tomlrb",             ">= 1.2", "< 2.1"
   spec.add_dependency "addressable",        "~> 2.4"
-  spec.add_dependency "parslet",            "~> 1.5"
+  spec.add_dependency "parslet",            ">= 1.5", "< 3.0"
   spec.add_dependency "semverse",           "~> 3.0"
   spec.add_dependency "multipart-post",     "~> 2.0"