diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # Revision history for ip2location.io
 
+## 1.5.1  -- 2026-07-24
+
+* Updated dependencies.
+
 ## 1.5.0  -- 2026-04-27
 
 * Added support for is_ai_crawler field.
diff --git a/Configuration.hs b/Configuration.hs
--- a/Configuration.hs
+++ b/Configuration.hs
@@ -28,4 +28,4 @@
 -}
 open :: String -> IO Config
 open apikey = do
-    return (Config apikey "sdk-haskell-iplio" "1.5.0")
+    return (Config apikey "sdk-haskell-iplio" "1.5.1")
diff --git a/DomainWhois.hs b/DomainWhois.hs
--- a/DomainWhois.hs
+++ b/DomainWhois.hs
@@ -31,12 +31,14 @@
 import Data.Text (Text, pack, unpack, replace, splitOn, drop, findIndex, reverse)
 import qualified Data.Text as T
 
+-- | Information about the domain registrar.
 data Registrar = Registrar
   { iana_id :: String
   , name :: String
   , url :: String
   } deriving (Show, Generic)
 
+-- | Contact information associated with a domain registration.
 data Contact = Contact
   { name :: String
   , organization :: String
@@ -50,6 +52,7 @@
   , email :: String
   } deriving (Show, Generic)
 
+-- | Successful response returned by the WHOIS API.
 data ResponseObj = ResponseObj
   { domain :: String
   , domain_id :: String
diff --git a/ip2location-io.cabal b/ip2location-io.cabal
--- a/ip2location-io.cabal
+++ b/ip2location-io.cabal
@@ -10,7 +10,7 @@
 -- PVP summary:      +-+------- breaking API changes
 --                   | | +----- non-breaking API additions
 --                   | | | +--- code changes with no API change
-version:             1.5.0
+version:             1.5.1
 
 -- A short (one-line) description of the package.
 synopsis:            IP2Location.io Haskell package for IP geolocation and domain WHOIS.
@@ -60,7 +60,7 @@
   -- other-extensions:    
   
   -- Other library packages from which modules are imported.
-  build-depends:       base >=4.9 && <=4.21, bytestring >=0.10 && <0.13, aeson >=1.5 && <2.3, http-types >=0.12 && <0.13, http-client >=0.6 && <0.8, http-client-tls >=0.3 && <0.4, uri-encode >=1.5 && <1.6, split <=0.2.5, text, network-uri
+  build-depends:       base >=4.9 && <4.23, bytestring >=0.10 && <0.13, aeson >=1.5 && <2.4, http-types >=0.12 && <0.13, http-client >=0.6 && <0.8, http-client-tls >=0.3 && <0.5, uri-encode >=1.5 && <1.6, split <=0.2.5, text, network-uri
   
   -- Directories containing source files.
   -- hs-source-dirs: