diff --git a/cryptol-remote-api/cryptol-remote-api.cabal b/cryptol-remote-api/cryptol-remote-api.cabal
index 5cf56bbe..4c1f2c30 100644
--- a/cryptol-remote-api/cryptol-remote-api.cabal
+++ b/cryptol-remote-api/cryptol-remote-api.cabal
@@ -55,7 +55,7 @@ common deps
     text                 >= 1.2.3 && < 2.1,
     tf-random,
     unordered-containers ^>= 0.2,
-    vector               ^>= 0.13,
+    vector               >= 0.12 && < 0.14,
 
   default-language:    Haskell2010