diff --git a/ghc-datasize.cabal b/ghc-datasize.cabal
--- a/ghc-datasize.cabal
+++ b/ghc-datasize.cabal
@@ -1,5 +1,5 @@
 name:               ghc-datasize
-version:            0.2.3
+version:            0.2.4
 license:            BSD3
 license-file:       LICENSE
 category:           GHC, Debug, Development
@@ -22,7 +22,7 @@
   Default-Language: Haskell2010
   Build-depends: base >= 4.12 && < 4.15,
                  deepseq >= 1.3 && < 1.5,
-                 ghc-lib-parser-ex,
+                 ghc-lib-parser >= 8.6 && < 8.11,
                  ghc-prim >= 0.5 && < 0.7
   Hs-source-dirs: src/
   Ghc-options: -Wall