diff --git a/lackey.cabal b/lackey.cabal
--- a/lackey.cabal
+++ b/lackey.cabal
@@ -1,7 +1,7 @@
 cabal-version: 2.2
 
 name: lackey
-version: 2.0.0.0
+version: 2.0.0.1
 
 synopsis: Generate Ruby clients from Servant APIs.
 description: Lackey generates Ruby clients from Servant APIs.
@@ -69,7 +69,7 @@
 
   build-depends:
     , hspec >= 2.7.6 && < 2.10
-    , servant >= 0.16.2 && < 0.19
+    , servant >= 0.16.2 && < 0.20
   hs-source-dirs: source/test-suite
   main-is: Main.hs
   type: exitcode-stdio-1.0