diff --git a/CHANGELOG.md b/CHANGELOG.md
index bb40737..8d0935c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,15 @@ Reverse Chronological Order:
 
 * Add your description here
 
+## `0.12.0` (2020-01-28)
+
+* Fix XRoxy provider
+* Fix multi-threading issues with config and adapter
+
+## `0.11.0` (2019-10-24)
+
+* Big gem refactoring
+
 ## `0.10.2` (2019-03-15)
 
 * Remove ProxyDocker provider (no longer workable)
diff --git a/lib/proxy_fetcher.rb b/lib/proxy_fetcher.rb
index 2caeca9..07dcf3b 100644
--- a/lib/proxy_fetcher.rb
+++ b/lib/proxy_fetcher.rb
@@ -41,8 +41,12 @@ module Providers
     require File.dirname(__FILE__) + "/proxy_fetcher/providers/xroxy"
   end
 
+  @__config_access_lock__ = Mutex.new
+  @__config_definition_lock__ = Mutex.new
+
   # Main ProxyFetcher module.
   class << self
+
     ##
     # Returns ProxyFetcher configuration.
     #
@@ -58,7 +62,9 @@ class << self
     #           @providers=[:free_proxy_list, ...], @adapter=ProxyFetcher::Document::NokogiriAdapter>
     #
     def config
-      @config ||= ProxyFetcher::Configuration.new
+      @__config_definition_lock__.synchronize do
+        @config ||= ProxyFetcher::Configuration.new
+      end
     end
 
     ##
@@ -70,7 +76,7 @@ def config
     #   Configuration object.
     #
     def configure
-      yield config
+      @__config_access_lock__.synchronize { yield config }
     end
 
     # Returns ProxyFetcher logger instance.
diff --git a/lib/proxy_fetcher/configuration.rb b/lib/proxy_fetcher/configuration.rb
index 7e5d235..699ff4c 100644
--- a/lib/proxy_fetcher/configuration.rb
+++ b/lib/proxy_fetcher/configuration.rb
@@ -39,7 +39,7 @@ class Configuration
     attr_accessor :logger
 
     # @!attribute [r] adapter
-    #   @return [Object] HTML parser adapter
+    #   @return [#to_s] HTML parser adapter
     attr_reader :adapter
 
     # @!attribute [r] http_client
@@ -68,6 +68,8 @@ class Configuration
     #
     DEFAULT_ADAPTER = :nokogiri
 
+    @__adapter_lock__ = Mutex.new
+
     class << self
       # Registry for handling proxy providers.
       #
@@ -131,11 +133,13 @@ def adapter=(value)
     end
 
     def adapter_class
-      return @adapter_class if defined?(@adapter_class)
+      self.class.instance_variable_get(:@__adapter_lock__).synchronize do
+        return @adapter_class if defined?(@adapter_class)
 
-      @adapter_class = ProxyFetcher::Document::Adapters.lookup(adapter)
-      @adapter_class.setup!
-      @adapter_class
+        @adapter_class = ProxyFetcher::Document::Adapters.lookup(adapter)
+        @adapter_class.setup!
+        @adapter_class
+      end
     end
 
     # Setups collection of providers that will be used to fetch proxies.
diff --git a/lib/proxy_fetcher/providers/xroxy.rb b/lib/proxy_fetcher/providers/xroxy.rb
index fd04748..6c6cf7f 100644
--- a/lib/proxy_fetcher/providers/xroxy.rb
+++ b/lib/proxy_fetcher/providers/xroxy.rb
@@ -6,11 +6,11 @@ module Providers
     class XRoxy < Base
       # Provider URL to fetch proxy list
       def provider_url
-        "https://www.xroxy.com/free-proxy-lists/"
+        "https://madison.xroxy.com/proxylist.html"
       end
 
       def xpath
-        "//div/table/tbody/tr"
+        "//tr[@class='row1' or @class='row0']"
       end
 
       # Converts HTML node (entry of N tags) to <code>ProxyFetcher::Proxy</code>
@@ -24,12 +24,12 @@ def xpath
       #
       def to_proxy(html_node)
         ProxyFetcher::Proxy.new.tap do |proxy|
-          proxy.addr = html_node.content_at("td[1]")
-          proxy.port = Integer(html_node.content_at("td[2]").gsub(/^0+/, ""))
-          proxy.anonymity = html_node.content_at("td[3]")
-          proxy.country = html_node.content_at("td[5]")
-          proxy.response_time = Integer(html_node.content_at("td[6]"))
-          proxy.type = html_node.content_at("td[3]")
+          proxy.addr = html_node.content_at("td[2]")
+          proxy.port = Integer(html_node.content_at("td[3]").gsub(/^0+/, ""))
+          proxy.anonymity = html_node.content_at("td[4]")
+          proxy.country = html_node.content_at("td[6]")
+          proxy.response_time = Integer(html_node.content_at("td[7]"))
+          proxy.type = html_node.content_at("td[4]")
         end
       end
     end
diff --git a/lib/proxy_fetcher/version.rb b/lib/proxy_fetcher/version.rb
index 39d3446..92b17ee 100644
--- a/lib/proxy_fetcher/version.rb
+++ b/lib/proxy_fetcher/version.rb
@@ -13,7 +13,7 @@ module VERSION
     # Major version number
     MAJOR = 0
     # Minor version number
-    MINOR = 11
+    MINOR = 12
     # Smallest version number
     TINY  = 0