diff --git a/Library/Homebrew/blacklist.rb b/Library/Homebrew/blacklist.rb
index a607ef0e63..6043ef6eb9 100644
--- a/Library/Homebrew/blacklist.rb
+++ b/Library/Homebrew/blacklist.rb
@@ -15,7 +15,7 @@ def blacklisted? name
     Installing TeX from source is weird and gross, requires a lot of patches,
     and only builds 32-bit (and thus can't use Homebrew deps on Snow Leopard.)
 
-    We recommend using a MacTeX distribution: http://www.tug.org/mactex/
+    We recommend using a MacTeX distribution: https://www.tug.org/mactex/
     EOS
   when 'pip' then <<-EOS.undent
     Homebrew provides pip via: `brew install python`. However you will then
@@ -78,8 +78,8 @@ def blacklisted? name
       brew install typesafe-activator
 
     You can read more about this change at:
-      http://www.playframework.com/documentation/2.3.x/Migration23
-      http://www.playframework.com/documentation/2.3.x/Highlights23
+      https://www.playframework.com/documentation/2.3.x/Migration23
+      https://www.playframework.com/documentation/2.3.x/Highlights23
     EOS
   when 'haskell-platform' then <<-EOS.undent
     We no longer package haskell-platform. Consider installing ghc
diff --git a/Library/Homebrew/cmd/aspell-dictionaries.rb b/Library/Homebrew/cmd/aspell-dictionaries.rb
index a6bf30b780..eb29a5d2d4 100644
--- a/Library/Homebrew/cmd/aspell-dictionaries.rb
+++ b/Library/Homebrew/cmd/aspell-dictionaries.rb
@@ -5,7 +5,7 @@ require 'formula'
 module Homebrew
   def aspell_dictionaries
     dict_url    = "http://ftpmirror.gnu.org/aspell/dict"
-    dict_mirror = "http://ftp.gnu.org/gnu/aspell/dict"
+    dict_mirror = "https://ftp.gnu.org/gnu/aspell/dict"
     languages   = {}
 
     open("#{dict_url}/0index.html") do |content|
diff --git a/Library/Homebrew/cmd/create.rb b/Library/Homebrew/cmd/create.rb
index 6f819bf5ab..f99bf00a56 100644
--- a/Library/Homebrew/cmd/create.rb
+++ b/Library/Homebrew/cmd/create.rb
@@ -10,7 +10,7 @@ module Homebrew
 
     # Allow searching MacPorts or Fink.
     if ARGV.include? '--macports'
-      exec_browser "http://www.macports.org/ports.php?by=name&substr=#{ARGV.next}"
+      exec_browser "https://www.macports.org/ports.php?by=name&substr=#{ARGV.next}"
     elsif ARGV.include? '--fink'
       exec_browser "http://pdb.finkproject.org/pdb/browse.php?summary=#{ARGV.next}"
     end
diff --git a/Library/Homebrew/cmd/doctor.rb b/Library/Homebrew/cmd/doctor.rb
index eef6282450..178bcbaee9 100644
--- a/Library/Homebrew/cmd/doctor.rb
+++ b/Library/Homebrew/cmd/doctor.rb
@@ -86,7 +86,7 @@ def check_path_for_trailing_slashes
 end
 
 # Installing MacGPG2 interferes with Homebrew in a big way
-# http://sourceforge.net/projects/macgpg2/files/
+# https://github.com/GPGTools/MacGPG2
 def check_for_macgpg2
   return if File.exist? '/usr/local/MacGPG2/share/gnupg/VERSION'
 
@@ -1081,8 +1081,8 @@ def check_for_pydistutils_cfg_in_home
   if File.exist? "#{ENV['HOME']}/.pydistutils.cfg" then <<-EOS.undent
     A .pydistutils.cfg file was found in $HOME, which may cause Python
     builds to fail. See:
-      http://bugs.python.org/issue6138
-      http://bugs.python.org/issue4655
+      https://bugs.python.org/issue6138
+      https://bugs.python.org/issue4655
     EOS
   end
 end
diff --git a/Library/Homebrew/cmd/search.rb b/Library/Homebrew/cmd/search.rb
index 36ebb49389..ba703a08be 100644
--- a/Library/Homebrew/cmd/search.rb
+++ b/Library/Homebrew/cmd/search.rb
@@ -9,11 +9,11 @@ module Homebrew
 
   def search
     if ARGV.include? '--macports'
-      exec_browser "http://www.macports.org/ports.php?by=name&substr=#{ARGV.next}"
+      exec_browser "https://www.macports.org/ports.php?by=name&substr=#{ARGV.next}"
     elsif ARGV.include? '--fink'
       exec_browser "http://pdb.finkproject.org/pdb/browse.php?summary=#{ARGV.next}"
     elsif ARGV.include? '--debian'
-      exec_browser "http://packages.debian.org/search?keywords=#{ARGV.next}&searchon=names&suite=all&section=all"
+      exec_browser "https://packages.debian.org/search?keywords=#{ARGV.next}&searchon=names&suite=all&section=all"
     elsif ARGV.include? '--opensuse'
       exec_browser "http://software.opensuse.org/search?q=#{ARGV.next}"
     elsif ARGV.include? '--fedora'
diff --git a/Library/Homebrew/download_strategy.rb b/Library/Homebrew/download_strategy.rb
index 55097a92af..dddc2cb654 100644
--- a/Library/Homebrew/download_strategy.rb
+++ b/Library/Homebrew/download_strategy.rb
@@ -285,7 +285,7 @@ class CurlDownloadStrategy < AbstractDownloadStrategy
     # We need a Pathname because we've monkeypatched extname to support double
     # extensions (e.g. tar.gz).
     # We can't use basename_without_params, because given a URL like
-    #   http://example.com/download.php?file=foo-1.0.tar.gz
+    #   https://example.com/download.php?file=foo-1.0.tar.gz
     # the extension we want is ".tar.gz", not ".php".
     Pathname.new(@url).extname[/[^?]+/]
   end
@@ -526,7 +526,7 @@ class GitDownloadStrategy < VCSDownloadStrategy
 
     dst = Dir.getwd
     cached_location.cd do
-      # http://stackoverflow.com/questions/160608/how-to-do-a-git-export-like-svn-export
+      # https://stackoverflow.com/questions/160608/how-to-do-a-git-export-like-svn-export
       safe_system 'git', 'checkout-index', '-a', '-f', "--prefix=#{dst}/"
       checkout_submodules(dst) if submodules?
     end
diff --git a/Library/Homebrew/extend/ENV/shared.rb b/Library/Homebrew/extend/ENV/shared.rb
index b25263a17c..9b83724b24 100644
--- a/Library/Homebrew/extend/ENV/shared.rb
+++ b/Library/Homebrew/extend/ENV/shared.rb
@@ -140,7 +140,7 @@ module SharedEnvExtension
   end
 
   # Snow Leopard defines an NCURSES value the opposite of most distros
-  # See: http://bugs.python.org/issue6848
+  # See: https://bugs.python.org/issue6848
   # Currently only used by aalib in core
   def ncurses_define
     append 'CPPFLAGS', "-DNCURSES_OPAQUE=0"
diff --git a/Library/Homebrew/os/mac.rb b/Library/Homebrew/os/mac.rb
index 29fcbe9580..14c9c38343 100644
--- a/Library/Homebrew/os/mac.rb
+++ b/Library/Homebrew/os/mac.rb
@@ -136,9 +136,9 @@ module OS
     end
 
     # See these issues for some history:
-    # http://github.com/Homebrew/homebrew/issues/13
-    # http://github.com/Homebrew/homebrew/issues/41
-    # http://github.com/Homebrew/homebrew/issues/48
+    # https://github.com/Homebrew/homebrew/issues/13
+    # https://github.com/Homebrew/homebrew/issues/41
+    # https://github.com/Homebrew/homebrew/issues/48
     def macports_or_fink
       paths = []
 
diff --git a/Library/Homebrew/os/mac/xcode.rb b/Library/Homebrew/os/mac/xcode.rb
index 5d5e02d9a3..46e5d55123 100644
--- a/Library/Homebrew/os/mac/xcode.rb
+++ b/Library/Homebrew/os/mac/xcode.rb
@@ -53,7 +53,7 @@ module OS
 
       # Ask Spotlight where Xcode is. If the user didn't install the
       # helper tools and installed Xcode in a non-conventional place, this
-      # is our only option. See: http://superuser.com/questions/390757
+      # is our only option. See: https://superuser.com/questions/390757
       def bundle_path
         MacOS.app_with_bundle_id(V4_BUNDLE_ID, V3_BUNDLE_ID)
       end
diff --git a/Library/Homebrew/os/mac/xquartz.rb b/Library/Homebrew/os/mac/xquartz.rb
index 79b50df44e..9c717367eb 100644
--- a/Library/Homebrew/os/mac/xquartz.rb
+++ b/Library/Homebrew/os/mac/xquartz.rb
@@ -42,8 +42,8 @@ module OS
         end
       end
 
-      # http://xquartz.macosforge.org/trac/wiki
-      # http://xquartz.macosforge.org/trac/wiki/Releases
+      # https://xquartz.macosforge.org/trac/wiki
+      # https://xquartz.macosforge.org/trac/wiki/Releases
       def latest_version
         case MacOS.version
         when "10.5"
diff --git a/Library/Homebrew/requirements.rb b/Library/Homebrew/requirements.rb
index a61289dd1b..e51ec488f8 100644
--- a/Library/Homebrew/requirements.rb
+++ b/Library/Homebrew/requirements.rb
@@ -61,7 +61,7 @@ end
 class TeXDependency < Requirement
   fatal true
   cask "mactex"
-  download "http://www.tug.org/mactex/"
+  download "https://www.tug.org/mactex/"
 
   satisfy { which('tex') || which('latex') }
 
diff --git a/Library/Homebrew/requirements/mpi_dependency.rb b/Library/Homebrew/requirements/mpi_dependency.rb
index 44fc234955..0f5a0be681 100644
--- a/Library/Homebrew/requirements/mpi_dependency.rb
+++ b/Library/Homebrew/requirements/mpi_dependency.rb
@@ -50,7 +50,7 @@ class MPIDependency < Requirement
   env do
     # Set environment variables to help configure scripts find MPI compilers.
     # Variable names taken from:
-    # http://www.gnu.org/software/autoconf-archive/ax_mpi.html
+    # https://www.gnu.org/software/autoconf-archive/ax_mpi.html
     @lang_list.each do |lang|
       compiler = 'mpi' + lang.to_s
       mpi_path = which compiler
diff --git a/Library/Homebrew/version.rb b/Library/Homebrew/version.rb
index 63097ba8c8..6102a8c35e 100644
--- a/Library/Homebrew/version.rb
+++ b/Library/Homebrew/version.rb
@@ -301,7 +301,7 @@ class Version
     m = /_((?:\d+\.)+\d+[abc]?)[.]orig$/.match(stem)
     return m.captures.first unless m.nil?
 
-    # e.g. http://www.openssl.org/source/openssl-0.9.8s.tar.gz
+    # e.g. https://www.openssl.org/source/openssl-0.9.8s.tar.gz
     m = /-v?([^-]+)/.match(stem)
     return m.captures.first unless m.nil?