diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,10 @@
 # Changelog for ghc-lib-parser-ex
 
+## 0.20200801 released 2020-08-01
+- Update to `ghc-lib-0.20200801`
+
+## 8.8.6.1 released 2020-07-16
+
 ## 0.20200704 released 2020-07-04
 - New function `isImportQualifiedPost`
 
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
@@ -1,6 +1,6 @@
 cabal-version: >= 1.18
 name:           ghc-lib-parser-ex
-version:        0.20200704
+version:        0.20200801
 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
diff --git a/src/Language/Haskell/GhclibParserEx/Fixity.hs b/src/Language/Haskell/GhclibParserEx/Fixity.hs
--- a/src/Language/Haskell/GhclibParserEx/Fixity.hs
+++ b/src/Language/Haskell/GhclibParserEx/Fixity.hs
@@ -213,7 +213,11 @@
 #else
 fixitiesFromModule :: Located (HsModule GhcPs) -> [(String, Fixity)]
 #endif
+#if defined(GHCLIB_API_811)
+fixitiesFromModule (L _ (HsModule _ _ _ _ decls _ _)) = concatMap f decls
+#else
 fixitiesFromModule (L _ (HsModule _ _ _ decls _ _)) = concatMap f decls
+#endif
   where
     f :: LHsDecl GhcPs -> [(String, Fixity)]
     f (L _ (SigD _ (FixSig _ (FixitySig _ ops (Fixity _ p dir))))) =
diff --git a/src/Language/Haskell/GhclibParserEx/GHC/Settings/Config.hs b/src/Language/Haskell/GhclibParserEx/GHC/Settings/Config.hs
--- a/src/Language/Haskell/GhclibParserEx/GHC/Settings/Config.hs
+++ b/src/Language/Haskell/GhclibParserEx/GHC/Settings/Config.hs
@@ -73,11 +73,15 @@
       , platformIsCrossCompiling=False
       , platformLeadingUnderscore=False
       , platformTablesNextToCode=False
+      , platformConstants=platformConstants
       ,
 #endif
-#if defined (GHCLIB_API_811) || defined (GHCLIB_API_810)
-        platformWordSize = PW8
-      , platformMini = PlatformMini {platformMini_arch=ArchUnknown, platformMini_os=OSUnknown}
+#if defined (GHCLIB_API_811)
+        platformWordSize=PW8
+      , platformArchOS=ArchOS {archOS_arch=ArchUnknown, archOS_OS=OSUnknown}
+#elif defined (GHCLIB_API_810)
+        platformWordSize=PW8
+      , platformMini=PlatformMini {platformMini_arch=ArchUnknown, platformMini_os=OSUnknown}
 #else
         platformWordSize=8
       , platformOS=OSUnknown