diff --git a/cabal.project b/cabal.project
index cc18fadd..c8c3c4b0 100644
--- a/cabal.project
+++ b/cabal.project
@@ -15,3 +15,5 @@ constraints:
         hie-plugin-api     +pedantic
 
 write-ghc-environment-files: never
+
+index-state: 2020-01-07T22:09:46Z