diff --git a/tinyapp.cabal b/tinyapp.cabal
--- a/tinyapp.cabal
+++ b/tinyapp.cabal
@@ -1,6 +1,6 @@
 cabal-version:      3.0
 name:               tinyapp
-version:            0.1.0.0
+version:            0.1.0.1
 synopsis:           Library to build tiny apps in Haskell
 description:        Library to build tiny apps in Haskell such a REPLs
 homepage:           https://github.com/bcardiff/haskell-tinyapp
@@ -39,5 +39,5 @@
     hs-source-dirs:   test
     main-is:          Main.hs
     build-depends:
-        base ^>=4.17.2.1,
+        base >=4.17.2.1 && <5.0,
         tinyapp