diff --git a/opentracing-zipkin-v2.cabal b/opentracing-zipkin-v2.cabal
--- a/opentracing-zipkin-v2.cabal
+++ b/opentracing-zipkin-v2.cabal
@@ -1,7 +1,7 @@
 cabal-version: 2.2
 
 name:           opentracing-zipkin-v2
-version:        0.3.0
+version:        0.3.0.1
 synopsis:       Zipkin V2 backend for OpenTracing
 homepage:       https://github.com/kim/opentracing
 bug-reports:    https://github.com/kim/opentracing/issues
@@ -36,7 +36,7 @@
     -Wnoncanonical-monad-instances
   build-depends:
       aeson >= 1.1
-    , base >= 4.9 && < 4.19
+    , base >= 4.9 && < 5
     , base64-bytestring >= 1.0
     , bytestring >= 0.10
     , exceptions >= 0.8