diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,8 @@
 # Changelog for ghc-lib-parser-ex
 
+## 8.10.0.21 released 2021-06-07
+- Bugfix cabal files
+
 ## 8.10.0.20 released 2021-06-06
 - Update to `ghc-lib-8.10.5.20210606`
 
diff --git a/ghc-lib-parser-ex.cabal b/ghc-lib-parser-ex.cabal
--- a/ghc-lib-parser-ex.cabal
+++ b/ghc-lib-parser-ex.cabal
@@ -1,18 +1,17 @@
 cabal-version: >= 1.18
 name:           ghc-lib-parser-ex
-version:        8.10.0.20
+version:        8.10.0.21
 description:    Please see the README on GitHub at <https://github.com/shayne-fletcher/ghc-lib-parser-ex#readme>
 homepage:       https://github.com/shayne-fletcher/ghc-lib-parser-ex#readme
 bug-reports:    https://github.com/shayne-fletcher/ghc-lib-parser-ex/issues
 author:         Shayne Fletcher
 maintainer:     shayne@shaynefletcher.org
-copyright:      Copyright © 2020, Shayne Fletcher. All rights reserved.
+copyright:      Copyright © 2020-2021 Shayne Fletcher. All rights reserved.
 license:        BSD3
 license-file:   LICENSE
 category:       Development
 synopsis:       Algorithms on GHC parse trees
 build-type:     Simple
-tested-with:    GHC==8.8.2, GHC==8.6.5
 extra-source-files:
     README.md
     ChangeLog.md
@@ -63,15 +62,15 @@
       uniplate >= 1.5,
       bytestring >= 0.10.8.2,
       containers >= 0.5.8.1
-  if flag(auto) && impl(ghc >= 9.0.0) && impl(ghc < 9.1.0)
+  if flag(auto) && impl(ghc >= 8.10.0) && impl(ghc < 8.11.0)
     build-depends:
-      ghc == 9.0.*,
+      ghc == 8.10.*,
       ghc-boot-th,
       ghc-boot
   else
     if flag(auto)
       build-depends:
-        ghc-lib-parser == 9.0.*
+        ghc-lib-parser == 8.10.*
     else
       if flag(no-ghc-lib)
         build-depends:
@@ -107,15 +106,15 @@
     , extra >=1.6
     , uniplate >= 1.6.12
     , ghc-lib-parser-ex
-  if flag(auto) && impl(ghc >= 9.0.0) && impl(ghc < 9.1.0)
+  if flag(auto) && impl(ghc >= 8.10.0) && impl(ghc < 8.11.0)
     build-depends:
-      ghc == 9.0.*,
+      ghc == 8.10.*,
       ghc-boot-th,
       ghc-boot
   else
     if flag(auto)
       build-depends:
-        ghc-lib-parser == 9.0.*
+        ghc-lib-parser == 8.10.*
     else
       if flag(no-ghc-lib)
         build-depends: