diff --git a/opentracing-wai.cabal b/opentracing-wai.cabal
--- a/opentracing-wai.cabal
+++ b/opentracing-wai.cabal
@@ -1,7 +1,7 @@
 cabal-version: 2.2
 
 name:           opentracing-wai
-version:        0.3.0
+version:        0.3.0.1
 synopsis:       Middleware adding OpenTracing tracing for WAI applications
 homepage:       https://github.com/kim/opentracing
 bug-reports:    https://github.com/kim/opentracing/issues
@@ -34,7 +34,7 @@
     -Wcompat
     -Wnoncanonical-monad-instances
   build-depends:
-      base >= 4.9 && < 4.19
+      base >= 4.9 && < 5
     , lens >= 4.19
     , opentracing >= 0.1
     , text >= 1.2