diff --git a/lackey.cabal b/lackey.cabal
--- a/lackey.cabal
+++ b/lackey.cabal
@@ -3,7 +3,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           lackey
-version:        0.3.0
+version:        0.3.1
 synopsis:       Generate Ruby clients from Servant APIs.
 description:    Lackey generates Ruby clients from Servant APIs.
 category:       Web
@@ -30,7 +30,7 @@
       library
   ghc-options: -Wall
   build-depends:
-      base >=4.8 && <4.9
+      base >=4.8 && <4.10
     , servant >=0.5 && <0.7
     , servant-foreign >=0.5 && <0.7
     , text >=1.2 && <1.3
diff --git a/package.yaml b/package.yaml
--- a/package.yaml
+++ b/package.yaml
@@ -10,7 +10,7 @@
 github: tfausak/lackey
 library:
   dependencies:
-  - base >=4.8 && <4.9
+  - base >=4.8 && <4.10
   - servant >=0.5 && <0.7
   - servant-foreign >=0.5 && <0.7
   - text >=1.2 && <1.3
@@ -34,4 +34,4 @@
     - -with-rtsopts=-N
     source-dirs: test-suite
     main: Main.hs
-version: '0.3.0'
+version: '0.3.1'