diff --git a/polysemy.cabal b/polysemy.cabal
--- a/polysemy.cabal
+++ b/polysemy.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           polysemy
-version:        1.9.1.0
+version:        1.9.1.1
 synopsis:       Higher-order, low-boilerplate free monads.
 description:    Please see the README on GitHub at <https://github.com/polysemy-research/polysemy#readme>
 category:       Language
@@ -167,7 +167,7 @@
       async >=2.2 && <3
     , base >=4.9 && <5
     , containers >=0.5 && <0.7
-    , doctest >=0.16.0.1 && <0.22
+    , doctest >=0.16.0.1 && <0.23
     , first-class-families >=0.5.0.0 && <0.9
     , hspec >=2.6.0 && <3
     , hspec-discover >=2.0