diff --git a/hls-fourmolu-plugin.cabal b/hls-fourmolu-plugin.cabal
--- a/hls-fourmolu-plugin.cabal
+++ b/hls-fourmolu-plugin.cabal
@@ -1,6 +1,6 @@
 cabal-version:      2.4
 name:               hls-fourmolu-plugin
-version:            1.0.1.2
+version:            1.0.2.0
 synopsis:           Integration with the Fourmolu code formatter
 description:
   Please see the README on GitHub at <https://github.com/haskell/haskell-language-server#readme>
@@ -23,11 +23,11 @@
   build-depends:
     , base            >=4.12 && <5
     , filepath
-    , fourmolu        ^>=0.3 || ^>=0.4
+    , fourmolu        ^>=0.3 || ^>=0.4 || ^>= 0.5
     , ghc
     , ghc-boot-th
-    , ghcide          ^>=1.5.0
-    , hls-plugin-api  >=1.1  && <1.3
+    , ghcide          ^>=1.6
+    , hls-plugin-api  ^>=1.3
     , lens
     , lsp
     , text
@@ -44,5 +44,5 @@
     , base
     , filepath
     , hls-fourmolu-plugin
-    , hls-test-utils       >=1.0 && <1.2
+    , hls-test-utils       ^>=1.2
     , lsp-test
diff --git a/src/Ide/Plugin/Fourmolu.hs b/src/Ide/Plugin/Fourmolu.hs
--- a/src/Ide/Plugin/Fourmolu.hs
+++ b/src/Ide/Plugin/Fourmolu.hs
@@ -79,12 +79,12 @@
   where
     fp' = fromNormalizedFilePath fp
     title = "Formatting " <> T.pack (takeFileName fp')
-    lspPrinterOpts = mempty{poIndentation = Just $ fo ^. tabSize}
+    lspPrinterOpts = mempty{poIndentation = Just $ fromIntegral $ fo ^. tabSize}
     region = case typ of
         FormatText ->
             RegionIndices Nothing Nothing
         FormatRange (Range (Position sl _) (Position el _)) ->
-            RegionIndices (Just $ sl + 1) (Just $ el + 1)
+            RegionIndices (Just $ fromIntegral $ sl + 1) (Just $ fromIntegral $ el + 1)
 
 convertDynFlags :: DynFlags -> IO [DynOption]
 convertDynFlags df =