diff --git a/nix/tools/tests.nix b/nix/tools/tests.nix
index d661b398a..08521b50b 100644
--- a/nix/tools/tests.nix
+++ b/nix/tools/tests.nix
@@ -41,12 +41,6 @@ let
         withEnv = postgrest.env;
       }
       ''
-        # For unknown reasons, doctests uses the wrong GHC package database outside
-        # nix-shell and fails, so we set the package path explicitly
-        #ghcWithPackages="$(cat ${postgrest.env})"
-        #ghcVersion="$(ls "$ghcWithPackages/lib")"
-        #export GHC_PACKAGE_PATH="$ghcWithPackages/lib/$ghcVersion/package.conf.d/"
-
         ${cabal-install}/bin/cabal v2-run ${devCabalOptions} test:doctests
       '';
 
diff --git a/update-ghc b/update-ghc
new file mode 160000
index 000000000..e2b67233f
--- /dev/null
+++ b/update-ghc
@@ -0,0 +1 @@
+Subproject commit e2b67233f76e45269e3da41f59caaf7ab8fd75b0