diff --git a/lib/solargraph/parser/rubyvm/class_methods.rb b/lib/solargraph/parser/rubyvm/class_methods.rb
index a208f4e8e..2533eb79e 100644
--- a/lib/solargraph/parser/rubyvm/class_methods.rb
+++ b/lib/solargraph/parser/rubyvm/class_methods.rb
@@ -108,9 +108,13 @@ def is_ast_node? node
         end
 
         def node_range node
+          if node.nil?
+            nil
+          else
           st = Position.new(node.first_lineno - 1, node.first_column)
           en = Position.new(node.last_lineno - 1, node.last_column)
           Range.new(st, en)
+          end
         end
 
         def recipient_node tree
diff --git a/lib/solargraph/pin/search.rb b/lib/solargraph/pin/search.rb
index 5564fac7c..da1de116d 100644
--- a/lib/solargraph/pin/search.rb
+++ b/lib/solargraph/pin/search.rb
@@ -49,7 +49,7 @@ def do_query
       # @return [Float]
       def fuzzy_string_match str1, str2
         return (1.0 + (str2.length.to_f / str1.length.to_f)) if str1.downcase.include?(str2.downcase)
-        JaroWinkler.distance(str1, str2, ignore_case: true)
+        JaroWinkler.similarity(str1, str2, ignore_case: true)
       end
     end
   end
diff --git a/solargraph.gemspec b/solargraph.gemspec
index 7be8dcb73..31a80b4c9 100755
--- a/solargraph.gemspec
+++ b/solargraph.gemspec
@@ -29,8 +29,11 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'diff-lcs', '~> 1.4'
   s.add_runtime_dependency 'e2mmap'
   s.add_runtime_dependency 'jaro_winkler', '~> 1.5'
+  s.add_runtime_dependency 'logger', '~> 1.6'
   s.add_runtime_dependency 'kramdown', '~> 2.3'
   s.add_runtime_dependency 'kramdown-parser-gfm', '~> 1.1'
+  s.add_runtime_dependency 'observer', '~> 0.1'
+  s.add_runtime_dependency 'ostruct', '~> 0.6'
   s.add_runtime_dependency 'parser', '~> 3.0'
   s.add_runtime_dependency 'rbs', '~> 2.0'
   s.add_runtime_dependency 'reverse_markdown', '~> 2.0'
@@ -41,6 +44,7 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency 'pry'
   s.add_development_dependency 'public_suffix', '~> 3.1'
+  s.add_development_dependency 'rake', '~> 13.2'
   s.add_development_dependency 'rspec', '~> 3.5'
   s.add_development_dependency 'simplecov', '~> 0.14'
   s.add_development_dependency 'webmock', '~> 3.6'