diff --git a/.ruby-version b/.ruby-version
index b502146..ef538c2 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.0.2
+3.1.2
diff --git a/README.md b/README.md
index fc683f2..932eedc 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ The gem should work on Linux, Mac and Windows (64bit) machines
 ## Benchmarks
 
 The fastest way to go through a massive amount of names is to use
-`Biodiversity::Parser.parse_ary([big array], simple = true)` function.
+`Biodiversity::Parser.parse_ary([big array], simple: true)` function.
 
 For example parsing a large file with one name per line:
 
@@ -75,10 +75,10 @@ Biodiversity.version
 # gnparser.
 
 # to parse a scientific name into a simple Ruby hash
-Biodiversity::Parser.parse("Plantago major", simple = true)
+Biodiversity::Parser.parse("Plantago major", simple: true)
 
 # to parse many scientific names using all computer CPUs
-Biodiversity::Parser.parse_ary(["Plantago major", ... ], simple = true)
+Biodiversity::Parser.parse_ary(["Plantago major", ... ], simple: true)
 
 # to parse a scientific name into a very detailed Ruby hash
 Biodiversity::Parser.parse("Plantago major")
diff --git a/biodiversity.gemspec b/biodiversity.gemspec
index 177e217..62ab009 100644
--- a/biodiversity.gemspec
+++ b/biodiversity.gemspec
@@ -18,12 +18,12 @@ Gem::Specification.new do |gem|
   gem.files         = `git ls-files`.split("\n")
   gem.require_paths = ['lib']
 
-  gem.add_runtime_dependency 'ffi', '~> 1.14'
+  gem.add_runtime_dependency 'ffi', '~> 1.15'
 
-  gem.add_development_dependency 'bundler', '~> 2.2'
+  gem.add_development_dependency 'bundler', '~> 2.4'
   gem.add_development_dependency 'byebug', '~> 11.1'
   gem.add_development_dependency 'rake', '~> 13.0'
-  gem.add_development_dependency 'rspec', '~> 3.10'
-  gem.add_development_dependency 'rubocop', '~> 1.8'
-  gem.add_development_dependency 'solargraph', '~> 0.43'
+  gem.add_development_dependency 'rspec', '~> 3.12'
+  gem.add_development_dependency 'rubocop', '~> 1.50'
+  gem.add_development_dependency 'solargraph', '~> 0.49'
 end
diff --git a/ext/gnparser-linux b/ext/gnparser-linux
index 792ab03..2291895 100755
Binary files a/ext/gnparser-linux and b/ext/gnparser-linux differ
diff --git a/ext/gnparser-mac b/ext/gnparser-mac
index 33983e1..6cfe3cc 100755
Binary files a/ext/gnparser-mac and b/ext/gnparser-mac differ
diff --git a/ext/gnparser-win.exe b/ext/gnparser-win.exe
index 05b8001..c26e7e0 100755
Binary files a/ext/gnparser-win.exe and b/ext/gnparser-win.exe differ
diff --git a/lib/biodiversity/version.rb b/lib/biodiversity/version.rb
index ce02d88..653e0a1 100644
--- a/lib/biodiversity/version.rb
+++ b/lib/biodiversity/version.rb
@@ -2,8 +2,8 @@
 
 # Biodiversity module provides a namespace for scientific name parser.
 module Biodiversity
-  VERSION = '5.3.3'
-  GNPARSER_VERSION = 'GNparser 1.3.3'
+  VERSION = '5.7.2'
+  GNPARSER_VERSION = 'GNparser 1.7.2'
 
   def self.version
     VERSION