diff --git a/declarative.cabal b/declarative.cabal
--- a/declarative.cabal
+++ b/declarative.cabal
@@ -1,5 +1,5 @@
 name:                declarative
-version:             0.5.3
+version:             0.5.4
 synopsis:            DIY Markov Chains.
 homepage:            http://github.com/jtobin/declarative
 license:             MIT
@@ -8,7 +8,7 @@
 maintainer:          jared@jtobin.ca
 category:            Math
 build-type:          Simple
-tested-with:         GHC == 8.2.2, GHC == 8.8.3
+tested-with:         GHC == 8.2.2, GHC == 8.8.3, GHC == 8.10.4
 cabal-version:       >=1.10
 description:
   This package presents a simple combinator language for Markov transition
@@ -67,7 +67,7 @@
     , mcmc-types        >= 1.0.1 && < 2
     , mwc-probability   >= 2.0 && < 3
     , mighty-metropolis >= 2.0 && < 3
-    , lens              >= 4 && < 5
+    , lens              >= 4 && < 6
     , primitive         >= 0.6 && < 1.0
     , pipes             >= 4 && < 5
     , hasty-hamiltonian >= 1.3 && < 2