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:        0.4.4
+version:        0.4.5
 synopsis:       Generate Ruby clients from Servant APIs.
 description:    Lackey generates Ruby clients from Servant APIs.
 category:       Web
@@ -48,7 +48,7 @@
       base
     , lackey
     , servant
-    , tasty >=0.11 && <0.12
+    , tasty >=0.11 && <0.13
     , tasty-hspec >=1.1 && <1.2
     , text
   default-language: Haskell2010
diff --git a/package.yaml b/package.yaml
--- a/package.yaml
+++ b/package.yaml
@@ -25,7 +25,7 @@
     - base
     - lackey
     - servant
-    - tasty >=0.11 && <0.12
+    - tasty >=0.11 && <0.13
     - tasty-hspec >=1.1 && <1.2
     - text
     ghc-options:
@@ -34,4 +34,4 @@
     - -with-rtsopts=-N
     source-dirs: test-suite
     main: Main.hs
-version: '0.4.4'
+version: '0.4.5'