diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -190,8 +190,8 @@
 instance {TParams {}{(}{Foo {TParam}}{, }{) => }}Foo {TParams {{Type}}{({Type} }{{TParam}}{ }{)}} where
 ```
 
-and `{Data ...}` expands to `{Product ...}{Sum ...}` which is useful when the same templates work for both product, and no special handling is needed for empty cases, prefix, separators or suffixes.
-
 which is useful to define an `instance` declaration for a typical typeclass that depends on instances for all type parameters.
+
+and `{Data ...}` expands to `{Product ...}{Sum ...}` which is useful when the same templates work for both product and sum types, and no special handling is needed for empty cases, prefix, separators or suffixes.
 
 Examples rules are available in the `boilerplate` directory of this repository.
diff --git a/boilerplate.cabal b/boilerplate.cabal
--- a/boilerplate.cabal
+++ b/boilerplate.cabal
@@ -1,13 +1,13 @@
 cabal-version:      2.2
 name:               boilerplate
-version:            0.0.2
+version:            0.0.3
 synopsis:           Generate Haskell boilerplate.
 license:            GPL-3.0-or-later
 license-file:       LICENSE
 author:             Tseen She
 maintainer:         Tseen She
 copyright:          2020 Tseen She
-tested-with:        GHC ^>=8.8.3
+tested-with:        GHC ^>=8.8.3 || ^>=8.10.7 || ^>=9.0.2 || ^>=9.2.7 || ^>=9.4.5 || ^>=9.6.1
 category:           Building
 description:
   Generates boilerplate from templates and markers in Haskell source code.
@@ -32,7 +32,8 @@
     , directory
     , filepath
     , ghc
-    , hsinspect     ^>=0.0.17
+    , ghc-boot
+    , hsinspect     ^>=0.0.17 || ^>=0.1.0
     , text
     , transformers
 
@@ -62,7 +63,7 @@
   build-depends:
     , ghc-paths
     , parsers    >0.12 && <0.13
-    , vector     >0.12 && <0.13
+    , vector     >0.12 && <0.14
 
   -- cabal-fmt: expand library
   exposed-modules:
diff --git a/exe/Main.hs b/exe/Main.hs
--- a/exe/Main.hs
+++ b/exe/Main.hs
@@ -12,7 +12,11 @@
 import Boilerplate.RuleFinder
 import Boilerplate.RuleParser
 import Boilerplate.Types
+#if MIN_VERSION_GLASGOW_HASKELL(9,0,0,0)
+import qualified GHC.Version as GHC
+#else
 import qualified Config as GHC
+#endif
 import Control.Monad (when)
 import Data.IORef (modifyIORef')
 import Data.IORef (readIORef)