diff --git a/Math/OEIS/Internal.hs b/Math/OEIS/Internal.hs
--- a/Math/OEIS/Internal.hs
+++ b/Math/OEIS/Internal.hs
@@ -8,15 +8,19 @@
 import Control.Arrow (second, (***))
 import Data.Char     (isSpace, toUpper, toLower)
 import Data.List     (intercalate, isPrefixOf, foldl')
-import Network.HTTP  (simpleHTTP, rspBody, rspCode, rqBody, rqHeaders, rqMethod, rqURI, Request(..), RequestMethod(GET))
 import Network.URI   (parseURI, URI)
 
+import qualified Network.HTTP.Client       as HTTP
+import qualified Network.HTTP.Client.TLS   as HTTP
+import qualified Network.HTTP.Types        as HTTP
+import qualified Data.ByteString.Lazy.UTF8 as U
+
 import Math.OEIS.Types
 
 --------------------------------------------------------------------------------
 
 baseSearchURI :: String
-baseSearchURI = "http://oeis.org/search?fmt=text&q="
+baseSearchURI = "https://oeis.org/search?fmt=text&q="
 
 idSearchURI :: String -> String
 idSearchURI n = baseSearchURI ++ "id:" ++ n
@@ -34,20 +38,12 @@
 
 get :: URI -> IO (Maybe String)
 get uri = do
-    ersp <- simpleHTTP (request uri)
-    return $ case ersp of
-      Left _ -> Nothing
-      Right rsp
-        | rspCode rsp == (2,0,0) -> Just $ rspBody rsp
-        | otherwise              -> Nothing
-
-request :: URI -> Request String
-request uri = Request
-  { rqURI     = uri
-  , rqMethod  = GET
-  , rqHeaders = []
-  , rqBody    = ""
-  }
+    httpman <- HTTP.newManager HTTP.tlsManagerSettings
+    let request = HTTP.requestFromURI_ uri
+    response <- HTTP.httpLbs request httpman
+    return $ case HTTP.statusIsSuccessful (HTTP.responseStatus response) of
+        False -> Nothing
+        True -> Just (U.toString (HTTP.responseBody response))
 
 readKeyword :: String -> Keyword
 readKeyword = read . capitalize
diff --git a/oeis.cabal b/oeis.cabal
--- a/oeis.cabal
+++ b/oeis.cabal
@@ -1,5 +1,5 @@
 name:         oeis
-version:      0.3.10
+version:      0.3.10.1
 category:     Math
 stability:    experimental
 
@@ -41,7 +41,6 @@
 library
   default-language: Haskell2010
 
-  ghc-options: -Wall -O2
   if impl(ghc >= 6.8)
     ghc-options: -fwarn-tabs
 
@@ -53,11 +52,14 @@
     Math.OEIS.Types
 
   build-depends:
-    HTTP    >= 4000.2 && < 4000.4,
+    http-client >= 0.7 && < 0.8,
+    http-client-tls >= 0.3 && < 0.4,
+    http-types >= 0.12 && < 0.13,
+    utf8-string >= 1.0 && < 1.1,
     base    >= 3 && < 5
 
   if flag(network-uri)
-    build-depends: network-uri >= 2.6, network >= 2.6
+    build-depends: network-uri >= 2.6 && < 2.7, network >= 2.6 && < 4.0
   else
     build-depends: network-uri < 2.6, network < 2.6
 
@@ -66,7 +68,6 @@
 test-suite main
   default-language: Haskell2010
 
-  ghc-options: -Wall -O2
   if impl(ghc >= 6.8)
     ghc-options: -fwarn-tabs
 
@@ -86,4 +87,4 @@
 
 source-repository head
   type:     git
-  location: git://github.com/niteria/oeis.git
+  location: https://github.com/niteria/oeis.git