diff --git a/hmpfr.cabal b/hmpfr.cabal
--- a/hmpfr.cabal
+++ b/hmpfr.cabal
@@ -1,5 +1,6 @@
+cabal-version:       3.0
 name:                hmpfr
-version:             0.4.4
+version:             0.4.5
 synopsis:            Haskell binding to the MPFR library
 description:
   Haskell binding to the MPFR library.
@@ -11,18 +12,17 @@
   Some simple examples of usage can be found in demo/Demo.hs.
 
 category:            Data, Math
-license:             BSD3
+license:             BSD-3-Clause
 license-file:        LICENSE
 Stability:           experimental
 Tested-with:
-                GHC==7.10.3
-                GHC==8.0.2
-                GHC==8.2.2
+                GHC==9.0.2
+                GHC==9.2.5
+                GHC==9.4.3
 author:              Aleš Bizjak, Michal Konečný
 maintainer:          Michal Konečný <mikkonecny@gmail.com>
 Homepage:            https://github.com/michalkonecny/hmpfr
 build-type:          Simple
-cabal-version:       >= 1.6
 Extra-source-files:  demo/Demo.hs
 
 Data-files:
@@ -34,18 +34,8 @@
   type:     git
   location: https://github.com/michalkonecny/hmpfr
 
-flag use-integer-simple
-  description: Use this when compiling using a ghc that uses integer-simple instead of integer-gmp.
-  default: False
-
 Library
   build-Depends:       base >= 4.8 && < 5
-  if flag(use-integer-simple)
-     build-Depends:    integer-simple
-     cpp-options: -DINTEGER_SIMPLE
-  else
-     build-Depends:    integer-gmp >= 1.0 && < 1.1
-     cpp-options: -DINTEGER_GMP
 
   Exposed-modules:
                        Data.Number.MPFR.FFIhelper
@@ -82,3 +72,4 @@
   c-sources:           cbits/chsmpfr.c
 
   extra-libraries:     mpfr
+  default-language:    Haskell2010
diff --git a/src/Data/Number/MPFR/Assignment.hs b/src/Data/Number/MPFR/Assignment.hs
--- a/src/Data/Number/MPFR/Assignment.hs
+++ b/src/Data/Number/MPFR/Assignment.hs
@@ -20,15 +20,7 @@
 
 import Data.Number.MPFR.Arithmetic
 
-#ifdef INTEGER_SIMPLE
-import GHC.Integer.Simple.Internals
-import Foreign.Storable (sizeOf)
-#endif
-
-#ifdef INTEGER_GMP
---import GHC.Integer.GMP.Internals
-import GHC.Float
-#endif
+import GHC.Num.Integer ( integerLogBase )
 
 set     :: RoundMode -> Precision -> MPFR -> MPFR
 set r p = fst . set_ r p
@@ -140,19 +132,7 @@
 
 bitsInInteger :: (Num a) => Integer -> a
 
-#  ifdef INTEGER_SIMPLE
-bitsInInteger Naught = 0
-bitsInInteger (Positive pos) = bitsInPositive pos
-bitsInInteger (Negative pos) = bitsInPositive pos
-bitsInPositive :: (Num a) => Positive -> a
-bitsInPositive None = 0
-bitsInPositive (Some _ rest) = 
-    (8 * sizeofInt) + (bitsInPositive rest)
-sizeofInt :: (Num a) => a 
-sizeofInt = fromIntegral $ sizeOf (0 :: Int) -- in bytes
-#else
-bitsInInteger = fromIntegral . GHC.Float.integerLogBase 2
-#endif
+bitsInInteger = fromIntegral . integerLogBase 2
 
 compose             :: RoundMode -> Precision -> (Integer, Int) -> MPFR 
 compose r p (i, ii) = div2i r p (fromIntegerA r p i) ii