diff --git a/cabal2spec.cabal b/cabal2spec.cabal
--- a/cabal2spec.cabal
+++ b/cabal2spec.cabal
@@ -1,5 +1,5 @@
 name:               cabal2spec
-version:            2.2.2.1
+version:            2.3
 synopsis:           Convert Cabal files into rpm spec files
 description:        Convert
                     Cabal files into a
@@ -14,7 +14,7 @@
 license-file:       LICENSE
 author:             Peter Simons, Bryan O'Sullivan, Jens Petersen
 maintainer:         simons@cryp.to
-tested-with:        GHC == 8.0.2, GHC == 8.2.2, GHC == 8.4.4, GHC == 8.6.3
+tested-with:        GHC == 8.0.2, GHC == 8.2.2, GHC == 8.4.4, GHC == 8.6.5, GHC == 8.8.1
 category:           Distribution
 homepage:           https://github.com/peti/cabal2spec
 build-type:         Simple
@@ -30,7 +30,7 @@
 library
   exposed-modules:    Cabal2Spec
   hs-source-dirs:     src
-  build-depends:      base < 5, Cabal > 2.2, filepath, time >= 1.5
+  build-depends:      base < 5, Cabal == 3.0.*, filepath, time >= 1.5
   default-language:   Haskell2010
   default-extensions: MonadFailDesugaring
   ghc-options:        -Wall -Wcompat -Wincomplete-uni-patterns -Wincomplete-record-updates
diff --git a/cabal2spec/Main.hs b/cabal2spec/Main.hs
--- a/cabal2spec/Main.hs
+++ b/cabal2spec/Main.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE RecordWildCards #-}
 
 module Main ( main ) where
@@ -7,6 +8,7 @@
 
 import Data.Maybe
 import Data.Monoid
+import Data.Version
 import Distribution.Compiler
 import Distribution.PackageDescription hiding ( options )
 import Distribution.System
@@ -36,16 +38,16 @@
   <*> strArgument (metavar "CABAL-FILE")
 
 parseFlag :: ReadM (FlagName,Bool)
-parseFlag = maybeReader $ \s -> case s of
-                                  []      -> Nothing
-                                  ('-':f) -> Just (mkFlagName f, False)
-                                  ('+':f) -> Just (mkFlagName f, True)
-                                  f       -> Just (mkFlagName f, True)
+parseFlag = maybeReader $ \case
+                            []      -> Nothing
+                            ('-':f) -> Just (mkFlagName f, False)
+                            ('+':f) -> Just (mkFlagName f, True)
+                            f       -> Just (mkFlagName f, True)
 
 pinfo :: ParserInfo Options
 pinfo = info
         (   helper
-        <*> infoOption ("cabal2spec " ++ display version) (long "version" <> help "Show version number")
+        <*> infoOption ("cabal2spec " ++ showVersion version) (long "version" <> help "Show version number")
         <*> options
         )
         (  fullDesc
diff --git a/src/Cabal2Spec.hs b/src/Cabal2Spec.hs
--- a/src/Cabal2Spec.hs
+++ b/src/Cabal2Spec.hs
@@ -372,7 +372,7 @@
 excludedPkgs pkgDesc = flip notElem (subLibs ++ ["Cabal", "base", "ghc-prim", "integer-gmp"])
   where
     subLibs :: [String]
-    subLibs = [ unUnqualComponentName ln | l <- subLibraries pkgDesc, Just ln <- [libName l] ]
+    subLibs = [ unUnqualComponentName ln | l <- subLibraries pkgDesc, LSubLibName ln <- [libName l] ]
 
 -- returns list of deps and whether package is self-dependent
 buildDependencies :: PackageDescription -> String -> ([String], Bool)
@@ -388,7 +388,7 @@
   depName :: a -> String
 
 instance IsDependency Dependency where
-  depName (Dependency n _) = unPackageName n
+  depName (Dependency n _ _) = unPackageName n
 
 instance IsDependency PkgconfigDependency where
   depName (PkgconfigDependency n _) = unPkgconfigName n