diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+# 2.0.11.1 (2022-03-28)
+- support building with Cabal 3.6
+
 # 2.0.11 (2022-03-13)
 - take build-tool-depends into account
 - 'spec','update': detect %autorelease and preserve %autochangelog
diff --git a/cabal-rpm.cabal b/cabal-rpm.cabal
--- a/cabal-rpm.cabal
+++ b/cabal-rpm.cabal
@@ -1,5 +1,5 @@
 Name:                cabal-rpm
-Version:             2.0.11
+Version:             2.0.11.1
 Synopsis:            RPM packaging tool for Haskell Cabal-based packages
 Description:
     This package provides a RPM packaging tool for Haskell Cabal-based packages.
@@ -45,7 +45,7 @@
 Executable cabal-rpm
     Main-is:            Main.hs
     Build-depends: base < 5,
-                   Cabal > 1.10 && < 3.5,
+                   Cabal > 1.10 && < 3.7,
                    directory,
                    extra,
                    filepath,
diff --git a/src/Commands/Spec.hs b/src/Commands/Spec.hs
--- a/src/Commands/Spec.hs
+++ b/src/Commands/Spec.hs
@@ -625,8 +625,7 @@
 showLicense PublicDomain = "Public Domain"
 showLicense AllRightsReserved = "Proprietary"
 showLicense OtherLicense = "Unknown"
--- FIXME
-showLicense (UnknownLicense l) = removePrefix "LicenseRef" l
+showLicense (UnknownLicense l) = removePrefix "LicenseRef" l  -- FIXME
 #if defined(MIN_VERSION_Cabal) && MIN_VERSION_Cabal(1,16,0)
 showLicense (Apache Nothing) = "ASL ?"
 showLicense (Apache (Just ver)) = "ASL" +-+ showVersion ver
diff --git a/src/FileUtils.hs b/src/FileUtils.hs
--- a/src/FileUtils.hs
+++ b/src/FileUtils.hs
@@ -34,7 +34,7 @@
 import Control.Monad (when)
 import Data.List
 import Data.Maybe (isJust)
-import SimpleCmd (cmd, error')
+import SimpleCmd
 import System.Directory (getCurrentDirectory, listDirectory,
                          setCurrentDirectory, removeDirectoryRecursive,
 #if (defined(MIN_VERSION_directory) && MIN_VERSION_directory(1,2,3))
@@ -44,6 +44,7 @@
 import System.FilePath
 import System.Posix.Files (fileSize, getFileStatus)
 
+#if !MIN_VERSION_simple_cmd(0,2,4)
 filesWithExtension :: FilePath -> String -> IO [FilePath]
 filesWithExtension dir ext =
   filter (ext `isExtensionOf`) <$> listDirectory dir
@@ -56,6 +57,7 @@
        [file] -> return $ Just $ dir </> file
        [] -> return Nothing
        _ -> putStrLn ("More than one " ++ ext ++ " file found!") >> return Nothing
+#endif
 
 -- looks in current dir for a unique file with given extension
 fileWithExtension_ :: FilePath -> String -> IO Bool
diff --git a/src/PackageUtils.hs b/src/PackageUtils.hs
--- a/src/PackageUtils.hs
+++ b/src/PackageUtils.hs
@@ -57,18 +57,19 @@
 import Stackage (defaultLTS, latestStackage)
 import Types
 
-#if (defined(MIN_VERSION_base) && MIN_VERSION_base(4,8,0))
-#else
+#if !MIN_VERSION_base(4,8,0)
 import Control.Applicative ((<$>))
 #endif
 import Control.Monad    (filterM, unless, void, when)
 
-import Data.Char (toLower)
-import Data.List
+import Data.List.Extra
 import Data.Maybe
 import Data.Time.Clock (diffUTCTime, getCurrentTime)
 
 import Distribution.Text (display, simpleParse)
+#if MIN_VERSION_Cabal(3,6,0)
+import Distribution.Utils.Path (getSymbolicPath)
+#endif
 
 import System.Directory
 import System.Environment (getEnv)
@@ -90,15 +91,16 @@
 findDocsLicenses dir pkgDesc = do
   contents <- listDirectory' dir
   let docs = sort $ filter unlikely $ filter (likely docNames) contents
-  let licenses = sort $ nub $ licenseFiles pkgDesc
-        ++ filter (likely licenseNames) contents
+  let licenses = sort $ nub
+                 (map getSymbolicPath (licenseFiles pkgDesc)
+                  ++ filter (likely licenseNames) contents)
       docfiles = if null licenses then docs else filter (`notElem` licenses) docs
   return (docfiles, licenses)
   where docNames = ["announce", "author", "bugs", "changelog", "changes",
                     "contribut", "example", "news", "readme", "todo"]
         licenseNames = ["copying", "licence", "license"]
-        likely names name = let lowerName = map toLower name
-                      in any (`isPrefixOf` lowerName) names
+        likely :: [String] -> String -> Bool
+        likely names name = any (`isPrefixOf` lower name) names
         unlikely name = not $ any (`isSuffixOf` name) ["~", ".cabal"]
 
 bringTarball :: PackageIdentifier -> Bool -> Maybe FilePath -> IO ()
@@ -532,3 +534,8 @@
 getSpecField :: String -> FilePath -> IO String
 getSpecField field spec =
   cmd "rpmspec" ["-q", "--qf", "%{" ++ field ++ "}", "--srpm", "--undefine", "dist", spec]
+
+#if !MIN_VERSION_Cabal(3,6,0)
+getSymbolicPath :: FilePath -> String
+getSymbolicPath = id
+#endif