diff --git a/compiler/cmm/CmmParse.y b/compiler/cmm/CmmParse.y
--- a/compiler/cmm/CmmParse.y
+++ b/compiler/cmm/CmmParse.y
@@ -203,6 +203,7 @@
 module CmmParse ( parseCmmFile ) where
 
 import GhcPrelude
+import qualified Prelude
 
 import GHC.StgToCmm.ExtCode
 import CmmCallConv
diff --git a/ghc-lib.cabal b/ghc-lib.cabal
--- a/ghc-lib.cabal
+++ b/ghc-lib.cabal
@@ -1,7 +1,7 @@
 cabal-version: >=1.22
 build-type: Simple
 name: ghc-lib
-version: 8.10.1.20200523
+version: 8.10.1.20200916
 license: BSD3
 license-file: LICENSE
 category: Development
@@ -23,8 +23,8 @@
     ghc-lib/stage0/lib/ghcversion.h
     ghc-lib/stage0/lib/DerivedConstants.h
     ghc-lib/stage0/lib/GHCConstantsHaskellExports.hs
-    ghc-lib/stage0/lib/GHCConstantsHaskellType.hs
     ghc-lib/stage0/lib/GHCConstantsHaskellWrappers.hs
+    ghc-lib/stage0/lib/GHCConstantsHaskellType.hs
     ghc-lib/stage0/compiler/build/primop-can-fail.hs-incl
     ghc-lib/stage0/compiler/build/primop-code-size.hs-incl
     ghc-lib/stage0/compiler/build/primop-commutable.hs-incl
@@ -46,14 +46,12 @@
     includes/CodeGen.Platform.hs
     compiler/GhclibHsVersions.h
     compiler/Unique.h
-tested-with: GHC==8.10.1, GHC==8.8.2, GHC==8.6.5, GHC==8.4.4
 source-repository head
     type: git
     location: git@github.com:digital-asset/ghc-lib.git
 
 library
     default-language:   Haskell2010
-    default-extensions: NoImplicitPrelude
     exposed: False
     include-dirs:
         includes
@@ -69,7 +67,7 @@
         build-depends: Win32
     build-depends:
         ghc-prim > 0.2 && < 0.7,
-        base >= 4.11 && < 4.15,
+        base >= 4.12 && < 4.15,
         containers >= 0.5 && < 0.7,
         bytestring >= 0.9 && < 0.11,
         binary == 0.8.*,
@@ -82,7 +80,7 @@
         transformers == 0.5.*,
         process >= 1 && < 1.7,
         hpc == 0.6.*,
-        ghc-lib-parser == 8.10.1.20200523
+        ghc-lib-parser == 8.10.1.20200916
     build-tools: alex >= 3.1, happy >= 1.19.4
     other-extensions:
         BangPatterns
@@ -117,6 +115,8 @@
         TypeSynonymInstances
         UnboxedTuples
         UndecidableInstances
+    default-extensions:
+        NoImplicitPrelude
     hs-source-dirs:
         ghc-lib/stage0/libraries/ghc-boot/build
         ghc-lib/stage0/compiler/build