diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # Revision history for ip2proxy
 
+## 2.2.1  -- 2020-04-22
+
+* Modified version requirement for base module.
+
 ## 2.2.0 -- 2019-11-25
 
 * Reduce I/O.
diff --git a/IP2Proxy.hs b/IP2Proxy.hs
--- a/IP2Proxy.hs
+++ b/IP2Proxy.hs
@@ -1,7 +1,7 @@
 {-|
 Module      : IP2Proxy
 Description : IP2Proxy Haskell package
-Copyright   : (c) IP2Location, 2019
+Copyright   : (c) IP2Location, 2020
 License     : MIT
 Maintainer  : sales@ip2location.com
 Stability   : experimental
@@ -99,7 +99,7 @@
     The 'getModuleVersion' function returns a string containing the module version.
 -}
 getModuleVersion :: String
-getModuleVersion = "2.2.0"
+getModuleVersion = "2.2.1"
 
 {-|
     The 'getPackageVersion' function returns a string containing the package version.
diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2019 IP2Location.com
+Copyright (c) 2020 IP2Location.com
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/ip2proxy.cabal b/ip2proxy.cabal
--- a/ip2proxy.cabal
+++ b/ip2proxy.cabal
@@ -10,7 +10,7 @@
 -- PVP summary:      +-+------- breaking API changes
 --                   | | +----- non-breaking API additions
 --                   | | | +--- code changes with no API change
-version:             2.2.0
+version:             2.2.1
 
 -- A short (one-line) description of the package.
 synopsis:            IP2Proxy Haskell package for proxy detection.
@@ -60,7 +60,7 @@
   -- other-extensions:    
   
   -- Other library packages from which modules are imported.
-  build-depends:       base >=4.11 && <4.12, bytestring >=0.10 && <0.11, binary >=0.8.4 && <0.9, iproute >=1.7 && <1.8
+  build-depends:       base >=4.11 && <=4.14, bytestring >=0.10 && <0.11, binary >=0.8.4 && <0.9, iproute >=1.7 && <1.8
   
   -- Directories containing source files.
   -- hs-source-dirs: