diff --git a/src/Data/Yaml/YamlLight/Lens.hs b/src/Data/Yaml/YamlLight/Lens.hs
--- a/src/Data/Yaml/YamlLight/Lens.hs
+++ b/src/Data/Yaml/YamlLight/Lens.hs
@@ -18,7 +18,6 @@
 import qualified Data.ByteString.Lex.Fractional as F
 import Data.Map (Map)
 import qualified Data.Map as Map
-import Data.Traversable (sequenceA)
 import Data.Yaml.YamlLight
 
 -- $setup
diff --git a/yaml-light-lens.cabal b/yaml-light-lens.cabal
--- a/yaml-light-lens.cabal
+++ b/yaml-light-lens.cabal
@@ -1,5 +1,5 @@
 name:                yaml-light-lens
-version:             0.3.3.6
+version:             0.3.4
 synopsis:            Lens interface to yaml-light.
 description:         Lenses for working with YAML documents.
 license:             BSD3
@@ -22,7 +22,7 @@
                        bytestring,
                        bytestring-lexing >= 0.5.0.2 && < 0.6,
                        containers,
-                       lens >= 4.0 && < 4.20,
+                       lens >= 4.0 && < 5.1,
                        yaml-light >= 0.1 && < 0.2
 
   -- Needed to help Cabal's solver: