diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,4 +1,8 @@
-# Revision history for vec
+# Version history for vec-lens
+
+## 0.4.1
+
+- Support GHC-8.6.5...9.10.1
 
 ## 0.4
 
diff --git a/src/Data/Vec/DataFamily/SpineStrict/Lens.hs b/src/Data/Vec/DataFamily/SpineStrict/Lens.hs
--- a/src/Data/Vec/DataFamily/SpineStrict/Lens.hs
+++ b/src/Data/Vec/DataFamily/SpineStrict/Lens.hs
@@ -1,4 +1,3 @@
-{-# LANGUAGE CPP                   #-}
 {-# LANGUAGE DataKinds             #-}
 {-# LANGUAGE FlexibleInstances     #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
@@ -108,18 +107,6 @@
 -------------------------------------------------------------------------------
 -- Instances
 -------------------------------------------------------------------------------
-
-#if !MIN_VERSION_lens(5,0,0)
-instance N.SNatI n => L.FunctorWithIndex (Fin n) (Vec n) where
-    imap = imap
-
-instance N.SNatI n => L.FoldableWithIndex (Fin n) (Vec n) where
-    ifoldMap = ifoldMap
-    ifoldr   = ifoldr
-
-instance N.SNatI n => L.TraversableWithIndex (Fin n) (Vec n) where
-    itraverse = itraverse
-#endif
 
 instance N.SNatI n => L.Each (Vec n a) (Vec n b) a b where
     each = traverse
diff --git a/src/Data/Vec/Lazy/Lens.hs b/src/Data/Vec/Lazy/Lens.hs
--- a/src/Data/Vec/Lazy/Lens.hs
+++ b/src/Data/Vec/Lazy/Lens.hs
@@ -103,18 +103,6 @@
 -- Instances
 -------------------------------------------------------------------------------
 
-#if !MIN_VERSION_lens(5,0,0)
-instance L.FunctorWithIndex (Fin n) (Vec n) where
-    imap = imap
-
-instance L.FoldableWithIndex (Fin n) (Vec n) where
-    ifoldMap = ifoldMap
-    ifoldr   = ifoldr
-
-instance L.TraversableWithIndex (Fin n) (Vec n) where
-    itraverse = itraverse
-#endif
-
 instance L.Each (Vec n a) (Vec n b) a b where
     each = traverse
 
diff --git a/src/Data/Vec/Pull/Lens.hs b/src/Data/Vec/Pull/Lens.hs
--- a/src/Data/Vec/Pull/Lens.hs
+++ b/src/Data/Vec/Pull/Lens.hs
@@ -1,4 +1,3 @@
-{-# LANGUAGE CPP                   #-}
 {-# LANGUAGE DataKinds             #-}
 {-# LANGUAGE GADTs                 #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
@@ -83,16 +82,3 @@
 -- | Prism from list.
 _Vec :: N.SNatI n => L.Prism' [a] (Vec n a)
 _Vec = L.prism' toList fromList
-
--------------------------------------------------------------------------------
--- Instances
--------------------------------------------------------------------------------
-
-#if !MIN_VERSION_lens(5,0,0)
-instance L.FunctorWithIndex (Fin n) (Vec n) where
-    imap = imap
-
-instance N.SNatI n => L.FoldableWithIndex (Fin n) (Vec n) where
-    ifoldMap = ifoldMap
-    ifoldr   = ifoldr
-#endif
diff --git a/vec-lens.cabal b/vec-lens.cabal
--- a/vec-lens.cabal
+++ b/vec-lens.cabal
@@ -1,6 +1,6 @@
 cabal-version:      2.2
 name:               vec-lens
-version:            0.4
+version:            0.4.1
 synopsis:           Vec: length-indexed (sized) list: lens support
 category:           Data, Dependent Types, Lens
 description:
@@ -20,15 +20,15 @@
 build-type:         Simple
 extra-source-files: ChangeLog.md
 tested-with:
-  GHC ==7.8.4
-   || ==7.10.3
-   || ==8.0.2
-   || ==8.2.2
-   || ==8.4.4
-   || ==8.6.5
+  GHC ==8.6.5
    || ==8.8.4
-   || ==8.10.4
-   || ==9.0.1
+   || ==8.10.7
+   || ==9.0.2
+   || ==9.2.8
+   || ==9.4.8
+   || ==9.6.5
+   || ==9.8.2
+   || ==9.10.1
 
 source-repository head
   type:     git
@@ -47,15 +47,15 @@
     Data.Vec.Pull.Lens
 
   -- GHC boot libs
-  build-depends:    base >=4.7 && <4.16
+  build-depends:    base >=4.12.0.0 && <4.21
 
   -- siblings
   build-depends:
-    , fin  ^>=0.2
-    , vec  ^>=0.4
+    , fin  ^>=0.3.1
+    , vec  ^>=0.5.1
 
   -- other dependencies
-  build-depends:    lens ^>=4.18.1 || ^>=4.19.1 || ^>=5
+  build-depends:    lens ^>=5.2.3 || ^>=5.3.2
   other-extensions:
     CPP
     FlexibleContexts