diff --git a/packages/bison.rb b/packages/bison.rb
index 79311d4be..b22cc014f 100644
--- a/packages/bison.rb
+++ b/packages/bison.rb
@@ -3,33 +3,33 @@ require 'package'
 class Bison < Package
   description 'Bison is a general-purpose parser generator that converts an annotated context-free grammar into a deterministic LR or generalized LR (GLR) parser employing LALR(1) parser tables.'
   homepage 'http://www.gnu.org/software/bison/'
-  version '3.2.3'
-  source_url 'https://ftpmirror.gnu.org/gnu/bison/bison-3.2.3.tar.xz'
-  source_sha256 '3cb07a84ff698b205ea244e36eccb4979dd4e10f2120ebbf58c5f1f700023f29'
+  version '3.4.2'
+  source_url 'https://ftpmirror.gnu.org/gnu/bison/bison-3.4.2.tar.xz'
+  source_sha256 '27d05534699735dc69e86add5b808d6cb35900ad3fd63fa82e3eb644336abfa0'
 
   binary_url ({
-    aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/bison-3.2.3-chromeos-armv7l.tar.xz',
-     armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/bison-3.2.3-chromeos-armv7l.tar.xz',
-       i686: 'https://dl.bintray.com/chromebrew/chromebrew/bison-3.2.3-chromeos-i686.tar.xz',
-     x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/bison-3.2.3-chromeos-x86_64.tar.xz',
+    aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/bison-3.4.2-chromeos-armv7l.tar.xz',
+     armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/bison-3.4.2-chromeos-armv7l.tar.xz',
+       i686: 'https://dl.bintray.com/chromebrew/chromebrew/bison-3.4.2-chromeos-i686.tar.xz',
+     x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/bison-3.4.2-chromeos-x86_64.tar.xz',
   })
   binary_sha256 ({
-    aarch64: '4cdc57fdbba01e5b1854c9c2ca84b616835575b5c73232528688b414162a333a',
-     armv7l: '4cdc57fdbba01e5b1854c9c2ca84b616835575b5c73232528688b414162a333a',
-       i686: '120e83f2906a36d6ce31c4b8ecb1ef7bab63d987b3392a5613b49bc655420178',
-     x86_64: '141fd756fb765dda1d110033360be9b4e582ed002d3f6bf895f8df9e5890d43b',
+    aarch64: '5e075d35935386c9f2e05c520ed10b2c0d5d453337f5d4cd6a663dcaaa675250',
+     armv7l: '5e075d35935386c9f2e05c520ed10b2c0d5d453337f5d4cd6a663dcaaa675250',
+       i686: '6a114d5b271549af936db512fabd910ae2329fcfd2373a83ce47f8c2232e3aae',
+     x86_64: 'd020a319652c3c70c3530c35b6fc9aba85d25be25fe40c160cb8cc8a87112a31',
   })
 
   def self.build
     system "./configure --prefix=#{CREW_PREFIX} --libdir=#{CREW_LIB_PREFIX}"
-    system "make"
+    system 'make'
   end
 
   def self.install
-    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+    system 'make', "DESTDIR=#{CREW_DEST_DIR}", 'install'
   end
 
   def self.check
-    system "make check"
+    system 'make check'
   end
 end