diff --git a/lackey.cabal b/lackey.cabal
--- a/lackey.cabal
+++ b/lackey.cabal
@@ -1,9 +1,9 @@
--- This file has been generated from package.yaml by hpack version 0.14.0.
+-- This file has been generated from package.yaml by hpack version 0.15.0.
 --
 -- see: https://github.com/sol/hpack
 
 name:           lackey
-version:        0.4.1
+version:        0.4.2
 synopsis:       Generate Ruby clients from Servant APIs.
 description:    Lackey generates Ruby clients from Servant APIs.
 category:       Web
@@ -31,8 +31,8 @@
   ghc-options: -Wall
   build-depends:
       base >=4.8 && <4.10
-    , servant >=0.8 && <0.10
-    , servant-foreign >=0.8 && <0.10
+    , servant >=0.8 && <0.11
+    , servant-foreign >=0.8 && <0.11
     , text >=1.2 && <1.3
   exposed-modules:
       Lackey
diff --git a/package.yaml b/package.yaml
--- a/package.yaml
+++ b/package.yaml
@@ -11,8 +11,8 @@
 library:
   dependencies:
   - base >=4.8 && <4.10
-  - servant >=0.8 && <0.10
-  - servant-foreign >=0.8 && <0.10
+  - servant >=0.8 && <0.11
+  - servant-foreign >=0.8 && <0.11
   - text >=1.2 && <1.3
   source-dirs: library
 license: MIT
@@ -34,4 +34,4 @@
     - -with-rtsopts=-N
     source-dirs: test-suite
     main: Main.hs
-version: '0.4.1'
+version: '0.4.2'