diff --git a/lib/bundler/vendor/uri/lib/uri.rb b/lib/bundler/vendor/uri/lib/uri.rb
index 976320f6bd..57b380c480 100644
--- a/lib/bundler/vendor/uri/lib/uri.rb
+++ b/lib/bundler/vendor/uri/lib/uri.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: false
 # Bundler::URI is a module providing classes to handle Uniform Resource Identifiers
-# (RFC2396[http://tools.ietf.org/html/rfc2396]).
+# (RFC2396[https://www.rfc-editor.org/rfc/rfc2396]).
 #
 # == Features
 #
@@ -47,14 +47,14 @@
 # A good place to view an RFC spec is http://www.ietf.org/rfc.html.
 #
 # Here is a list of all related RFC's:
-# - RFC822[http://tools.ietf.org/html/rfc822]
-# - RFC1738[http://tools.ietf.org/html/rfc1738]
-# - RFC2255[http://tools.ietf.org/html/rfc2255]
-# - RFC2368[http://tools.ietf.org/html/rfc2368]
-# - RFC2373[http://tools.ietf.org/html/rfc2373]
-# - RFC2396[http://tools.ietf.org/html/rfc2396]
-# - RFC2732[http://tools.ietf.org/html/rfc2732]
-# - RFC3986[http://tools.ietf.org/html/rfc3986]
+# - RFC822[https://www.rfc-editor.org/rfc/rfc822]
+# - RFC1738[https://www.rfc-editor.org/rfc/rfc1738]
+# - RFC2255[https://www.rfc-editor.org/rfc/rfc2255]
+# - RFC2368[https://www.rfc-editor.org/rfc/rfc2368]
+# - RFC2373[https://www.rfc-editor.org/rfc/rfc2373]
+# - RFC2396[https://www.rfc-editor.org/rfc/rfc2396]
+# - RFC2732[https://www.rfc-editor.org/rfc/rfc2732]
+# - RFC3986[https://www.rfc-editor.org/rfc/rfc3986]
 #
 # == Class tree
 #
diff --git a/lib/bundler/vendor/uri/lib/uri/common.rb b/lib/bundler/vendor/uri/lib/uri/common.rb
index 89044da036..c7236fce98 100644
--- a/lib/bundler/vendor/uri/lib/uri/common.rb
+++ b/lib/bundler/vendor/uri/lib/uri/common.rb
@@ -13,26 +13,52 @@ require_relative "rfc2396_parser"
 require_relative "rfc3986_parser"
 
 module Bundler::URI
-  include RFC2396_REGEXP
-
-  REGEXP = RFC2396_REGEXP
-  Parser = RFC2396_Parser
-  RFC3986_PARSER = RFC3986_Parser.new
-  Ractor.make_shareable(RFC3986_PARSER) if defined?(Ractor)
   RFC2396_PARSER = RFC2396_Parser.new
   Ractor.make_shareable(RFC2396_PARSER) if defined?(Ractor)
 
-  # Bundler::URI::Parser.new
-  DEFAULT_PARSER = Parser.new
-  DEFAULT_PARSER.pattern.each_pair do |sym, str|
-    unless REGEXP::PATTERN.const_defined?(sym)
-      REGEXP::PATTERN.const_set(sym, str)
+  RFC3986_PARSER = RFC3986_Parser.new
+  Ractor.make_shareable(RFC3986_PARSER) if defined?(Ractor)
+
+  DEFAULT_PARSER = RFC3986_PARSER
+  Ractor.make_shareable(DEFAULT_PARSER) if defined?(Ractor)
+
+  def self.parser=(parser = RFC3986_PARSER)
+    remove_const(:Parser) if defined?(::Bundler::URI::Parser)
+    const_set("Parser", parser.class)
+
+    remove_const(:REGEXP) if defined?(::Bundler::URI::REGEXP)
+    remove_const(:PATTERN) if defined?(::Bundler::URI::PATTERN)
+    if Parser == RFC2396_Parser
+      const_set("REGEXP", Bundler::URI::RFC2396_REGEXP)
+      const_set("PATTERN", Bundler::URI::RFC2396_REGEXP::PATTERN)
+      Parser.new.pattern.each_pair do |sym, str|
+        unless REGEXP::PATTERN.const_defined?(sym)
+          REGEXP::PATTERN.const_set(sym, str)
+        end
+      end
+    end
+
+    Parser.new.regexp.each_pair do |sym, str|
+      remove_const(sym) if const_defined?(sym)
+      const_set(sym, str)
     end
   end
-  DEFAULT_PARSER.regexp.each_pair do |sym, str|
-    const_set(sym, str)
+  self.parser = RFC3986_PARSER
+
+  def self.const_missing(const)
+    if const == :REGEXP
+      warn "Bundler::URI::REGEXP is obsolete. Use Bundler::URI::RFC2396_REGEXP explicitly.", uplevel: 1 if $VERBOSE
+      Bundler::URI::RFC2396_REGEXP
+    elsif value = RFC2396_PARSER.regexp[const]
+      warn "Bundler::URI::#{const} is obsolete. Use RFC2396_PARSER.regexp[#{const.inspect}] explicitly.", uplevel: 1 if $VERBOSE
+      value
+    elsif value = RFC2396_Parser.const_get(const)
+      warn "Bundler::URI::#{const} is obsolete. Use RFC2396_Parser::#{const} explicitly.", uplevel: 1 if $VERBOSE
+      value
+    else
+      super
+    end
   end
-  Ractor.make_shareable(DEFAULT_PARSER) if defined?(Ractor)
 
   module Util # :nodoc:
     def make_components_hash(klass, array_hash)
@@ -170,7 +196,7 @@ module Bundler::URI
   #    ["fragment", "top"]]
   #
   def self.split(uri)
-    RFC3986_PARSER.split(uri)
+    DEFAULT_PARSER.split(uri)
   end
 
   # Returns a new \Bundler::URI object constructed from the given string +uri+:
@@ -184,7 +210,7 @@ module Bundler::URI
   # if it may contain invalid Bundler::URI characters.
   #
   def self.parse(uri)
-    RFC3986_PARSER.parse(uri)
+    DEFAULT_PARSER.parse(uri)
   end
 
   # Merges the given Bundler::URI strings +str+
@@ -211,7 +237,7 @@ module Bundler::URI
   #   # => #<Bundler::URI::HTTP http://example.com/foo/bar>
   #
   def self.join(*str)
-    RFC3986_PARSER.join(*str)
+    DEFAULT_PARSER.join(*str)
   end
 
   #
diff --git a/lib/bundler/vendor/uri/lib/uri/file.rb b/lib/bundler/vendor/uri/lib/uri/file.rb
index 8d75a9de7a..de347af6eb 100644
--- a/lib/bundler/vendor/uri/lib/uri/file.rb
+++ b/lib/bundler/vendor/uri/lib/uri/file.rb
@@ -70,17 +70,17 @@ module Bundler::URI
 
     # raise InvalidURIError
     def check_userinfo(user)
-      raise Bundler::URI::InvalidURIError, "can not set userinfo for file Bundler::URI"
+      raise Bundler::URI::InvalidURIError, "cannot set userinfo for file Bundler::URI"
     end
 
     # raise InvalidURIError
     def check_user(user)
-      raise Bundler::URI::InvalidURIError, "can not set user for file Bundler::URI"
+      raise Bundler::URI::InvalidURIError, "cannot set user for file Bundler::URI"
     end
 
     # raise InvalidURIError
     def check_password(user)
-      raise Bundler::URI::InvalidURIError, "can not set password for file Bundler::URI"
+      raise Bundler::URI::InvalidURIError, "cannot set password for file Bundler::URI"
     end
 
     # do nothing
diff --git a/lib/bundler/vendor/uri/lib/uri/ftp.rb b/lib/bundler/vendor/uri/lib/uri/ftp.rb
index 48b4c6718d..f83985fd3d 100644
--- a/lib/bundler/vendor/uri/lib/uri/ftp.rb
+++ b/lib/bundler/vendor/uri/lib/uri/ftp.rb
@@ -17,7 +17,7 @@ module Bundler::URI
   # This class will be redesigned because of difference of implementations;
   # the structure of its path. draft-hoffman-ftp-uri-04 is a draft but it
   # is a good summary about the de facto spec.
-  # http://tools.ietf.org/html/draft-hoffman-ftp-uri-04
+  # https://datatracker.ietf.org/doc/html/draft-hoffman-ftp-uri-04
   #
   class FTP < Generic
     # A Default port of 21 for Bundler::URI::FTP.
diff --git a/lib/bundler/vendor/uri/lib/uri/generic.rb b/lib/bundler/vendor/uri/lib/uri/generic.rb
index 762c425ac1..8b097fba99 100644
--- a/lib/bundler/vendor/uri/lib/uri/generic.rb
+++ b/lib/bundler/vendor/uri/lib/uri/generic.rb
@@ -82,7 +82,7 @@ module Bundler::URI
         if args.kind_of?(Array)
           return self.build(args.collect{|x|
             if x.is_a?(String)
-              DEFAULT_PARSER.escape(x)
+              Bundler::URI::RFC2396_PARSER.escape(x)
             else
               x
             end
@@ -91,7 +91,7 @@ module Bundler::URI
           tmp = {}
           args.each do |key, value|
             tmp[key] = if value
-                DEFAULT_PARSER.escape(value)
+                Bundler::URI::RFC2396_PARSER.escape(value)
               else
                 value
               end
@@ -393,7 +393,7 @@ module Bundler::URI
     def check_user(v)
       if @opaque
         raise InvalidURIError,
-          "can not set user with opaque"
+          "cannot set user with opaque"
       end
 
       return v unless v
@@ -417,7 +417,7 @@ module Bundler::URI
     def check_password(v, user = @user)
       if @opaque
         raise InvalidURIError,
-          "can not set password with opaque"
+          "cannot set password with opaque"
       end
       return v unless v
 
@@ -596,7 +596,7 @@ module Bundler::URI
 
       if @opaque
         raise InvalidURIError,
-          "can not set host with registry or opaque"
+          "cannot set host with registry or opaque"
       elsif parser.regexp[:HOST] !~ v
         raise InvalidComponentError,
           "bad component(expected host component): #{v}"
@@ -685,7 +685,7 @@ module Bundler::URI
 
       if @opaque
         raise InvalidURIError,
-          "can not set port with registry or opaque"
+          "cannot set port with registry or opaque"
       elsif !v.kind_of?(Integer) && parser.regexp[:PORT] !~ v
         raise InvalidComponentError,
           "bad component(expected port component): #{v.inspect}"
@@ -733,17 +733,17 @@ module Bundler::URI
     end
 
     def check_registry(v) # :nodoc:
-      raise InvalidURIError, "can not set registry"
+      raise InvalidURIError, "cannot set registry"
     end
     private :check_registry
 
     def set_registry(v) #:nodoc:
-      raise InvalidURIError, "can not set registry"
+      raise InvalidURIError, "cannot set registry"
     end
     protected :set_registry
 
     def registry=(v)
-      raise InvalidURIError, "can not set registry"
+      raise InvalidURIError, "cannot set registry"
     end
 
     #
@@ -866,7 +866,7 @@ module Bundler::URI
       # hier_part     = ( net_path | abs_path ) [ "?" query ]
       if @host || @port || @user || @path  # userinfo = @user + ':' + @password
         raise InvalidURIError,
-          "can not set opaque with host, port, userinfo or path"
+          "cannot set opaque with host, port, userinfo or path"
       elsif v && parser.regexp[:OPAQUE] !~ v
         raise InvalidComponentError,
           "bad component(expected opaque component): #{v}"
@@ -945,7 +945,7 @@ module Bundler::URI
     # == Description
     #
     # Bundler::URI has components listed in order of decreasing significance from left to right,
-    # see RFC3986 https://tools.ietf.org/html/rfc3986 1.2.3.
+    # see RFC3986 https://www.rfc-editor.org/rfc/rfc3986 1.2.3.
     #
     # == Usage
     #
@@ -1235,7 +1235,7 @@ module Bundler::URI
         return rel, rel
       end
 
-      # you can modify `rel', but can not `oth'.
+      # you can modify `rel', but cannot `oth'.
       return oth, rel
     end
     private :route_from0
@@ -1260,7 +1260,7 @@ module Bundler::URI
     #   #=> #<Bundler::URI::Generic /main.rbx?page=1>
     #
     def route_from(oth)
-      # you can modify `rel', but can not `oth'.
+      # you can modify `rel', but cannot `oth'.
       begin
         oth, rel = route_from0(oth)
       rescue
@@ -1364,6 +1364,9 @@ module Bundler::URI
           str << ':'
           str << @port.to_s
         end
+        if (@host || @port) && !@path.empty? && !@path.start_with?('/')
+          str << '/'
+        end
         str << @path
         if @query
           str << '?'
@@ -1399,19 +1402,6 @@ module Bundler::URI
       self.component_ary.eql?(oth.component_ary)
     end
 
-=begin
-
---- Bundler::URI::Generic#===(oth)
-
-=end
-#    def ===(oth)
-#      raise NotImplementedError
-#    end
-
-=begin
-=end
-
-
     # Returns an Array of the components defined from the COMPONENT Array.
     def component_ary
       component.collect do |x|
diff --git a/lib/bundler/vendor/uri/lib/uri/http.rb b/lib/bundler/vendor/uri/lib/uri/http.rb
index 2c44810644..6c34a469b7 100644
--- a/lib/bundler/vendor/uri/lib/uri/http.rb
+++ b/lib/bundler/vendor/uri/lib/uri/http.rb
@@ -85,7 +85,7 @@ module Bundler::URI
     # == Description
     #
     # Returns the authority for an HTTP uri, as defined in
-    # https://datatracker.ietf.org/doc/html/rfc3986/#section-3.2.
+    # https://www.rfc-editor.org/rfc/rfc3986#section-3.2.
     #
     #
     # Example:
@@ -106,7 +106,7 @@ module Bundler::URI
     # == Description
     #
     # Returns the origin for an HTTP uri, as defined in
-    # https://datatracker.ietf.org/doc/html/rfc6454.
+    # https://www.rfc-editor.org/rfc/rfc6454.
     #
     #
     # Example:
diff --git a/lib/bundler/vendor/uri/lib/uri/rfc2396_parser.rb b/lib/bundler/vendor/uri/lib/uri/rfc2396_parser.rb
index 09c22c9906..0b7897d92a 100644
--- a/lib/bundler/vendor/uri/lib/uri/rfc2396_parser.rb
+++ b/lib/bundler/vendor/uri/lib/uri/rfc2396_parser.rb
@@ -140,11 +140,11 @@ module Bundler::URI
 
         if !scheme
           raise InvalidURIError,
-            "bad Bundler::URI(absolute but no scheme): #{uri}"
+            "bad Bundler::URI (absolute but no scheme): #{uri}"
         end
         if !opaque && (!path && (!host && !registry))
           raise InvalidURIError,
-            "bad Bundler::URI(absolute but no path): #{uri}"
+            "bad Bundler::URI (absolute but no path): #{uri}"
         end
 
       when @regexp[:REL_URI]
@@ -173,7 +173,7 @@ module Bundler::URI
         # server        = [ [ userinfo "@" ] hostport ]
 
       else
-        raise InvalidURIError, "bad Bundler::URI(is not Bundler::URI?): #{uri}"
+        raise InvalidURIError, "bad Bundler::URI (is not Bundler::URI?): #{uri}"
       end
 
       path = '' if !path && !opaque # (see RFC2396 Section 5.2)
diff --git a/lib/bundler/vendor/uri/lib/uri/rfc3986_parser.rb b/lib/bundler/vendor/uri/lib/uri/rfc3986_parser.rb
index 4c9882f595..7473adcb68 100644
--- a/lib/bundler/vendor/uri/lib/uri/rfc3986_parser.rb
+++ b/lib/bundler/vendor/uri/lib/uri/rfc3986_parser.rb
@@ -78,7 +78,7 @@ module Bundler::URI
       begin
         uri = uri.to_str
       rescue NoMethodError
-        raise InvalidURIError, "bad Bundler::URI(is not Bundler::URI?): #{uri.inspect}"
+        raise InvalidURIError, "bad Bundler::URI (is not Bundler::URI?): #{uri.inspect}"
       end
       uri.ascii_only? or
         raise InvalidURIError, "Bundler::URI must be ascii only #{uri.dump}"
@@ -127,7 +127,7 @@ module Bundler::URI
           m["fragment"]
         ]
       else
-        raise InvalidURIError, "bad Bundler::URI(is not Bundler::URI?): #{uri.inspect}"
+        raise InvalidURIError, "bad Bundler::URI (is not Bundler::URI?): #{uri.inspect}"
       end
     end
 
@@ -135,12 +135,35 @@ module Bundler::URI
       Bundler::URI.for(*self.split(uri), self)
     end
 
-
     def join(*uris) # :nodoc:
       uris[0] = convert_to_uri(uris[0])
       uris.inject :merge
     end
 
+    # Compatibility for RFC2396 parser
+    def extract(str, schemes = nil, &block) # :nodoc:
+      warn "Bundler::URI::RFC3986_PARSER.extract is obsoleted. Use Bundler::URI::RFC2396_PARSER.extract explicitly.", uplevel: 1 if $VERBOSE
+      RFC2396_PARSER.extract(str, schemes, &block)
+    end
+
+    # Compatibility for RFC2396 parser
+    def make_regexp(schemes = nil) # :nodoc:
+      warn "Bundler::URI::RFC3986_PARSER.make_regexp is obsoleted. Use Bundler::URI::RFC2396_PARSER.make_regexp explicitly.", uplevel: 1 if $VERBOSE
+      RFC2396_PARSER.make_regexp(schemes)
+    end
+
+    # Compatibility for RFC2396 parser
+    def escape(str, unsafe = nil) # :nodoc:
+      warn "Bundler::URI::RFC3986_PARSER.escape is obsoleted. Use Bundler::URI::RFC2396_PARSER.escape explicitly.", uplevel: 1 if $VERBOSE
+      unsafe ? RFC2396_PARSER.escape(str, unsafe) : RFC2396_PARSER.escape(str)
+    end
+
+    # Compatibility for RFC2396 parser
+    def unescape(str, escaped = nil) # :nodoc:
+      warn "Bundler::URI::RFC3986_PARSER.unescape is obsoleted. Use Bundler::URI::RFC2396_PARSER.unescape explicitly.", uplevel: 1 if $VERBOSE
+      escaped ? RFC2396_PARSER.unescape(str, escaped) : RFC2396_PARSER.unescape(str)
+    end
+
     @@to_s = Kernel.instance_method(:to_s)
     if @@to_s.respond_to?(:bind_call)
       def inspect
diff --git a/lib/bundler/vendor/uri/lib/uri/version.rb b/lib/bundler/vendor/uri/lib/uri/version.rb
index ac94e15221..ce236bdb30 100644
--- a/lib/bundler/vendor/uri/lib/uri/version.rb
+++ b/lib/bundler/vendor/uri/lib/uri/version.rb
@@ -1,6 +1,6 @@
 module Bundler::URI
   # :stopdoc:
-  VERSION_CODE = '001301'.freeze
+  VERSION_CODE = '010001'.freeze
   VERSION = VERSION_CODE.scan(/../).collect{|n| n.to_i}.join('.').freeze
   # :startdoc:
 end
diff --git a/lib/rubygems/vendor/uri/lib/uri.rb b/lib/rubygems/vendor/uri/lib/uri.rb
index f1ccc167cc..4691b122b2 100644
--- a/lib/rubygems/vendor/uri/lib/uri.rb
+++ b/lib/rubygems/vendor/uri/lib/uri.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: false
 # Gem::URI is a module providing classes to handle Uniform Resource Identifiers
-# (RFC2396[http://tools.ietf.org/html/rfc2396]).
+# (RFC2396[https://www.rfc-editor.org/rfc/rfc2396]).
 #
 # == Features
 #
@@ -47,14 +47,14 @@
 # A good place to view an RFC spec is http://www.ietf.org/rfc.html.
 #
 # Here is a list of all related RFC's:
-# - RFC822[http://tools.ietf.org/html/rfc822]
-# - RFC1738[http://tools.ietf.org/html/rfc1738]
-# - RFC2255[http://tools.ietf.org/html/rfc2255]
-# - RFC2368[http://tools.ietf.org/html/rfc2368]
-# - RFC2373[http://tools.ietf.org/html/rfc2373]
-# - RFC2396[http://tools.ietf.org/html/rfc2396]
-# - RFC2732[http://tools.ietf.org/html/rfc2732]
-# - RFC3986[http://tools.ietf.org/html/rfc3986]
+# - RFC822[https://www.rfc-editor.org/rfc/rfc822]
+# - RFC1738[https://www.rfc-editor.org/rfc/rfc1738]
+# - RFC2255[https://www.rfc-editor.org/rfc/rfc2255]
+# - RFC2368[https://www.rfc-editor.org/rfc/rfc2368]
+# - RFC2373[https://www.rfc-editor.org/rfc/rfc2373]
+# - RFC2396[https://www.rfc-editor.org/rfc/rfc2396]
+# - RFC2732[https://www.rfc-editor.org/rfc/rfc2732]
+# - RFC3986[https://www.rfc-editor.org/rfc/rfc3986]
 #
 # == Class tree
 #
diff --git a/lib/rubygems/vendor/uri/lib/uri/common.rb b/lib/rubygems/vendor/uri/lib/uri/common.rb
index da2651084c..37c5c80270 100644
--- a/lib/rubygems/vendor/uri/lib/uri/common.rb
+++ b/lib/rubygems/vendor/uri/lib/uri/common.rb
@@ -13,26 +13,52 @@ require_relative "rfc2396_parser"
 require_relative "rfc3986_parser"
 
 module Gem::URI
-  include RFC2396_REGEXP
-
-  REGEXP = RFC2396_REGEXP
-  Parser = RFC2396_Parser
-  RFC3986_PARSER = RFC3986_Parser.new
-  Ractor.make_shareable(RFC3986_PARSER) if defined?(Ractor)
   RFC2396_PARSER = RFC2396_Parser.new
   Ractor.make_shareable(RFC2396_PARSER) if defined?(Ractor)
 
-  # Gem::URI::Parser.new
-  DEFAULT_PARSER = Parser.new
-  DEFAULT_PARSER.pattern.each_pair do |sym, str|
-    unless REGEXP::PATTERN.const_defined?(sym)
-      REGEXP::PATTERN.const_set(sym, str)
+  RFC3986_PARSER = RFC3986_Parser.new
+  Ractor.make_shareable(RFC3986_PARSER) if defined?(Ractor)
+
+  DEFAULT_PARSER = RFC3986_PARSER
+  Ractor.make_shareable(DEFAULT_PARSER) if defined?(Ractor)
+
+  def self.parser=(parser = RFC3986_PARSER)
+    remove_const(:Parser) if defined?(::Gem::URI::Parser)
+    const_set("Parser", parser.class)
+
+    remove_const(:REGEXP) if defined?(::Gem::URI::REGEXP)
+    remove_const(:PATTERN) if defined?(::Gem::URI::PATTERN)
+    if Parser == RFC2396_Parser
+      const_set("REGEXP", Gem::URI::RFC2396_REGEXP)
+      const_set("PATTERN", Gem::URI::RFC2396_REGEXP::PATTERN)
+      Parser.new.pattern.each_pair do |sym, str|
+        unless REGEXP::PATTERN.const_defined?(sym)
+          REGEXP::PATTERN.const_set(sym, str)
+        end
+      end
+    end
+
+    Parser.new.regexp.each_pair do |sym, str|
+      remove_const(sym) if const_defined?(sym)
+      const_set(sym, str)
     end
   end
-  DEFAULT_PARSER.regexp.each_pair do |sym, str|
-    const_set(sym, str)
+  self.parser = RFC3986_PARSER
+
+  def self.const_missing(const)
+    if const == :REGEXP
+      warn "Gem::URI::REGEXP is obsolete. Use Gem::URI::RFC2396_REGEXP explicitly.", uplevel: 1 if $VERBOSE
+      Gem::URI::RFC2396_REGEXP
+    elsif value = RFC2396_PARSER.regexp[const]
+      warn "Gem::URI::#{const} is obsolete. Use RFC2396_PARSER.regexp[#{const.inspect}] explicitly.", uplevel: 1 if $VERBOSE
+      value
+    elsif value = RFC2396_Parser.const_get(const)
+      warn "Gem::URI::#{const} is obsolete. Use RFC2396_Parser::#{const} explicitly.", uplevel: 1 if $VERBOSE
+      value
+    else
+      super
+    end
   end
-  Ractor.make_shareable(DEFAULT_PARSER) if defined?(Ractor)
 
   module Util # :nodoc:
     def make_components_hash(klass, array_hash)
@@ -170,7 +196,7 @@ module Gem::URI
   #    ["fragment", "top"]]
   #
   def self.split(uri)
-    RFC3986_PARSER.split(uri)
+    DEFAULT_PARSER.split(uri)
   end
 
   # Returns a new \Gem::URI object constructed from the given string +uri+:
@@ -184,7 +210,7 @@ module Gem::URI
   # if it may contain invalid Gem::URI characters.
   #
   def self.parse(uri)
-    RFC3986_PARSER.parse(uri)
+    DEFAULT_PARSER.parse(uri)
   end
 
   # Merges the given Gem::URI strings +str+
@@ -211,7 +237,7 @@ module Gem::URI
   #   # => #<Gem::URI::HTTP http://example.com/foo/bar>
   #
   def self.join(*str)
-    RFC3986_PARSER.join(*str)
+    DEFAULT_PARSER.join(*str)
   end
 
   #
diff --git a/lib/rubygems/vendor/uri/lib/uri/file.rb b/lib/rubygems/vendor/uri/lib/uri/file.rb
index d419b26055..768755fc2d 100644
--- a/lib/rubygems/vendor/uri/lib/uri/file.rb
+++ b/lib/rubygems/vendor/uri/lib/uri/file.rb
@@ -70,17 +70,17 @@ module Gem::URI
 
     # raise InvalidURIError
     def check_userinfo(user)
-      raise Gem::URI::InvalidURIError, "can not set userinfo for file Gem::URI"
+      raise Gem::URI::InvalidURIError, "cannot set userinfo for file Gem::URI"
     end
 
     # raise InvalidURIError
     def check_user(user)
-      raise Gem::URI::InvalidURIError, "can not set user for file Gem::URI"
+      raise Gem::URI::InvalidURIError, "cannot set user for file Gem::URI"
     end
 
     # raise InvalidURIError
     def check_password(user)
-      raise Gem::URI::InvalidURIError, "can not set password for file Gem::URI"
+      raise Gem::URI::InvalidURIError, "cannot set password for file Gem::URI"
     end
 
     # do nothing
diff --git a/lib/rubygems/vendor/uri/lib/uri/ftp.rb b/lib/rubygems/vendor/uri/lib/uri/ftp.rb
index 100498ffb2..7517813029 100644
--- a/lib/rubygems/vendor/uri/lib/uri/ftp.rb
+++ b/lib/rubygems/vendor/uri/lib/uri/ftp.rb
@@ -17,7 +17,7 @@ module Gem::URI
   # This class will be redesigned because of difference of implementations;
   # the structure of its path. draft-hoffman-ftp-uri-04 is a draft but it
   # is a good summary about the de facto spec.
-  # http://tools.ietf.org/html/draft-hoffman-ftp-uri-04
+  # https://datatracker.ietf.org/doc/html/draft-hoffman-ftp-uri-04
   #
   class FTP < Generic
     # A Default port of 21 for Gem::URI::FTP.
diff --git a/lib/rubygems/vendor/uri/lib/uri/generic.rb b/lib/rubygems/vendor/uri/lib/uri/generic.rb
index 72c52aa8ee..06da4a3b4e 100644
--- a/lib/rubygems/vendor/uri/lib/uri/generic.rb
+++ b/lib/rubygems/vendor/uri/lib/uri/generic.rb
@@ -82,7 +82,7 @@ module Gem::URI
         if args.kind_of?(Array)
           return self.build(args.collect{|x|
             if x.is_a?(String)
-              DEFAULT_PARSER.escape(x)
+              Gem::URI::RFC2396_PARSER.escape(x)
             else
               x
             end
@@ -91,7 +91,7 @@ module Gem::URI
           tmp = {}
           args.each do |key, value|
             tmp[key] = if value
-                DEFAULT_PARSER.escape(value)
+                Gem::URI::RFC2396_PARSER.escape(value)
               else
                 value
               end
@@ -393,7 +393,7 @@ module Gem::URI
     def check_user(v)
       if @opaque
         raise InvalidURIError,
-          "can not set user with opaque"
+          "cannot set user with opaque"
       end
 
       return v unless v
@@ -417,7 +417,7 @@ module Gem::URI
     def check_password(v, user = @user)
       if @opaque
         raise InvalidURIError,
-          "can not set password with opaque"
+          "cannot set password with opaque"
       end
       return v unless v
 
@@ -596,7 +596,7 @@ module Gem::URI
 
       if @opaque
         raise InvalidURIError,
-          "can not set host with registry or opaque"
+          "cannot set host with registry or opaque"
       elsif parser.regexp[:HOST] !~ v
         raise InvalidComponentError,
           "bad component(expected host component): #{v}"
@@ -685,7 +685,7 @@ module Gem::URI
 
       if @opaque
         raise InvalidURIError,
-          "can not set port with registry or opaque"
+          "cannot set port with registry or opaque"
       elsif !v.kind_of?(Integer) && parser.regexp[:PORT] !~ v
         raise InvalidComponentError,
           "bad component(expected port component): #{v.inspect}"
@@ -733,17 +733,17 @@ module Gem::URI
     end
 
     def check_registry(v) # :nodoc:
-      raise InvalidURIError, "can not set registry"
+      raise InvalidURIError, "cannot set registry"
     end
     private :check_registry
 
     def set_registry(v) #:nodoc:
-      raise InvalidURIError, "can not set registry"
+      raise InvalidURIError, "cannot set registry"
     end
     protected :set_registry
 
     def registry=(v)
-      raise InvalidURIError, "can not set registry"
+      raise InvalidURIError, "cannot set registry"
     end
 
     #
@@ -866,7 +866,7 @@ module Gem::URI
       # hier_part     = ( net_path | abs_path ) [ "?" query ]
       if @host || @port || @user || @path  # userinfo = @user + ':' + @password
         raise InvalidURIError,
-          "can not set opaque with host, port, userinfo or path"
+          "cannot set opaque with host, port, userinfo or path"
       elsif v && parser.regexp[:OPAQUE] !~ v
         raise InvalidComponentError,
           "bad component(expected opaque component): #{v}"
@@ -945,7 +945,7 @@ module Gem::URI
     # == Description
     #
     # Gem::URI has components listed in order of decreasing significance from left to right,
-    # see RFC3986 https://tools.ietf.org/html/rfc3986 1.2.3.
+    # see RFC3986 https://www.rfc-editor.org/rfc/rfc3986 1.2.3.
     #
     # == Usage
     #
@@ -1235,7 +1235,7 @@ module Gem::URI
         return rel, rel
       end
 
-      # you can modify `rel', but can not `oth'.
+      # you can modify `rel', but cannot `oth'.
       return oth, rel
     end
     private :route_from0
@@ -1260,7 +1260,7 @@ module Gem::URI
     #   #=> #<Gem::URI::Generic /main.rbx?page=1>
     #
     def route_from(oth)
-      # you can modify `rel', but can not `oth'.
+      # you can modify `rel', but cannot `oth'.
       begin
         oth, rel = route_from0(oth)
       rescue
@@ -1364,6 +1364,9 @@ module Gem::URI
           str << ':'
           str << @port.to_s
         end
+        if (@host || @port) && !@path.empty? && !@path.start_with?('/')
+          str << '/'
+        end
         str << @path
         if @query
           str << '?'
@@ -1399,19 +1402,6 @@ module Gem::URI
       self.component_ary.eql?(oth.component_ary)
     end
 
-=begin
-
---- Gem::URI::Generic#===(oth)
-
-=end
-#    def ===(oth)
-#      raise NotImplementedError
-#    end
-
-=begin
-=end
-
-
     # Returns an Array of the components defined from the COMPONENT Array.
     def component_ary
       component.collect do |x|
diff --git a/lib/rubygems/vendor/uri/lib/uri/http.rb b/lib/rubygems/vendor/uri/lib/uri/http.rb
index bef43490a3..658e9941dd 100644
--- a/lib/rubygems/vendor/uri/lib/uri/http.rb
+++ b/lib/rubygems/vendor/uri/lib/uri/http.rb
@@ -85,7 +85,7 @@ module Gem::URI
     # == Description
     #
     # Returns the authority for an HTTP uri, as defined in
-    # https://datatracker.ietf.org/doc/html/rfc3986/#section-3.2.
+    # https://www.rfc-editor.org/rfc/rfc3986#section-3.2.
     #
     #
     # Example:
@@ -106,7 +106,7 @@ module Gem::URI
     # == Description
     #
     # Returns the origin for an HTTP uri, as defined in
-    # https://datatracker.ietf.org/doc/html/rfc6454.
+    # https://www.rfc-editor.org/rfc/rfc6454.
     #
     #
     # Example:
diff --git a/lib/rubygems/vendor/uri/lib/uri/rfc2396_parser.rb b/lib/rubygems/vendor/uri/lib/uri/rfc2396_parser.rb
index 735a269f2c..d222bdc438 100644
--- a/lib/rubygems/vendor/uri/lib/uri/rfc2396_parser.rb
+++ b/lib/rubygems/vendor/uri/lib/uri/rfc2396_parser.rb
@@ -140,11 +140,11 @@ module Gem::URI
 
         if !scheme
           raise InvalidURIError,
-            "bad Gem::URI(absolute but no scheme): #{uri}"
+            "bad Gem::URI (absolute but no scheme): #{uri}"
         end
         if !opaque && (!path && (!host && !registry))
           raise InvalidURIError,
-            "bad Gem::URI(absolute but no path): #{uri}"
+            "bad Gem::URI (absolute but no path): #{uri}"
         end
 
       when @regexp[:REL_URI]
@@ -173,7 +173,7 @@ module Gem::URI
         # server        = [ [ userinfo "@" ] hostport ]
 
       else
-        raise InvalidURIError, "bad Gem::URI(is not Gem::URI?): #{uri}"
+        raise InvalidURIError, "bad Gem::URI (is not Gem::URI?): #{uri}"
       end
 
       path = '' if !path && !opaque # (see RFC2396 Section 5.2)
diff --git a/lib/rubygems/vendor/uri/lib/uri/rfc3986_parser.rb b/lib/rubygems/vendor/uri/lib/uri/rfc3986_parser.rb
index 728bb55674..53dec866c2 100644
--- a/lib/rubygems/vendor/uri/lib/uri/rfc3986_parser.rb
+++ b/lib/rubygems/vendor/uri/lib/uri/rfc3986_parser.rb
@@ -78,7 +78,7 @@ module Gem::URI
       begin
         uri = uri.to_str
       rescue NoMethodError
-        raise InvalidURIError, "bad Gem::URI(is not Gem::URI?): #{uri.inspect}"
+        raise InvalidURIError, "bad Gem::URI (is not Gem::URI?): #{uri.inspect}"
       end
       uri.ascii_only? or
         raise InvalidURIError, "Gem::URI must be ascii only #{uri.dump}"
@@ -127,7 +127,7 @@ module Gem::URI
           m["fragment"]
         ]
       else
-        raise InvalidURIError, "bad Gem::URI(is not Gem::URI?): #{uri.inspect}"
+        raise InvalidURIError, "bad Gem::URI (is not Gem::URI?): #{uri.inspect}"
       end
     end
 
@@ -135,12 +135,35 @@ module Gem::URI
       Gem::URI.for(*self.split(uri), self)
     end
 
-
     def join(*uris) # :nodoc:
       uris[0] = convert_to_uri(uris[0])
       uris.inject :merge
     end
 
+    # Compatibility for RFC2396 parser
+    def extract(str, schemes = nil, &block) # :nodoc:
+      warn "Gem::URI::RFC3986_PARSER.extract is obsoleted. Use Gem::URI::RFC2396_PARSER.extract explicitly.", uplevel: 1 if $VERBOSE
+      RFC2396_PARSER.extract(str, schemes, &block)
+    end
+
+    # Compatibility for RFC2396 parser
+    def make_regexp(schemes = nil) # :nodoc:
+      warn "Gem::URI::RFC3986_PARSER.make_regexp is obsoleted. Use Gem::URI::RFC2396_PARSER.make_regexp explicitly.", uplevel: 1 if $VERBOSE
+      RFC2396_PARSER.make_regexp(schemes)
+    end
+
+    # Compatibility for RFC2396 parser
+    def escape(str, unsafe = nil) # :nodoc:
+      warn "Gem::URI::RFC3986_PARSER.escape is obsoleted. Use Gem::URI::RFC2396_PARSER.escape explicitly.", uplevel: 1 if $VERBOSE
+      unsafe ? RFC2396_PARSER.escape(str, unsafe) : RFC2396_PARSER.escape(str)
+    end
+
+    # Compatibility for RFC2396 parser
+    def unescape(str, escaped = nil) # :nodoc:
+      warn "Gem::URI::RFC3986_PARSER.unescape is obsoleted. Use Gem::URI::RFC2396_PARSER.unescape explicitly.", uplevel: 1 if $VERBOSE
+      escaped ? RFC2396_PARSER.unescape(str, escaped) : RFC2396_PARSER.unescape(str)
+    end
+
     @@to_s = Kernel.instance_method(:to_s)
     if @@to_s.respond_to?(:bind_call)
       def inspect
diff --git a/lib/rubygems/vendor/uri/lib/uri/version.rb b/lib/rubygems/vendor/uri/lib/uri/version.rb
index 080744095c..ce9ab59580 100644
--- a/lib/rubygems/vendor/uri/lib/uri/version.rb
+++ b/lib/rubygems/vendor/uri/lib/uri/version.rb
@@ -1,6 +1,6 @@
 module Gem::URI
   # :stopdoc:
-  VERSION_CODE = '001301'.freeze
+  VERSION_CODE = '010001'.freeze
   VERSION = VERSION_CODE.scan(/../).collect{|n| n.to_i}.join('.').freeze
   # :startdoc:
 end
diff --git a/tool/bundler/vendor_gems.rb b/tool/bundler/vendor_gems.rb
index 4b7cdb67be..85b38c4cf3 100644
--- a/tool/bundler/vendor_gems.rb
+++ b/tool/bundler/vendor_gems.rb
@@ -14,3 +14,4 @@ gem "securerandom", "0.3.1"
 gem "timeout", "0.4.1"
 gem "thor", "1.3.0"
 gem "tsort", "0.2.0"
+gem "uri", "1.0.1"