diff --git a/hledger-web/hledger-web.cabal b/hledger-web/hledger-web.cabal
index dd80a40c7..38b3fdbbc 100644
--- a/hledger-web/hledger-web.cabal
+++ b/hledger-web/hledger-web.cabal
@@ -135,7 +135,7 @@ library
                    , wai
                    , wai-extra
                    , wai-handler-launch   >= 1.3 && < 1.4
-                   , warp
+                   , warp                 >= 1.3 && < 2
                    , yaml
                    , yesod                >= 1.2 && < 1.3
                    , yesod-core
@@ -226,7 +226,7 @@ executable         hledger-web
                    , wai
                    , wai-extra
                    , wai-handler-launch   >= 1.3 && < 1.4
-                   , warp
+                   , warp                 >= 1.3 && < 2
                    , yaml
                    , yesod                >= 1.2 && < 1.3
                    , yesod-core