diff --git a/cabal.config b/cabal.config
index d889975..14f726b 100644
--- a/cabal.config
+++ b/cabal.config
@@ -691,6 +691,7 @@ constraints: abstract-deque ==0.3,
              Spock-worker ==0.2.1.3,
              spoon ==0.3.1,
              sqlite-simple ==0.4.8.0,
+             stackage == 0.6.0,
              stateref ==0.3,
              statestack ==0.2.0.3,
              statistics ==0.13.2.1,