diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c2a7e19..75035d8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -56,28 +56,3 @@ jobs:
         continue-on-error: ${{ matrix.julia-version == 'nightly' }}
       - uses: julia-actions/julia-runtest@v1
         continue-on-error: ${{ matrix.julia-version == 'nightly' }}
-
-  docs:
-    name: Documentation
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: julia-actions/setup-julia@v2
-        with:
-          version: '1.6'
-      - run: |
-          julia --project=docs -e '
-            using Pkg
-            Pkg.develop(PackageSpec(path=pwd()))
-            Pkg.instantiate()'
-      - run: |
-          julia --project=docs/ -e '
-            using Functors
-            using Documenter
-            using Documenter: doctest
-            DocMeta.setdocmeta!(Functors, :DocTestSetup, :(using Functors); recursive = true)
-            doctest(Functors)'
-      - run: julia --project=docs docs/make.jl
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          DOCUMENTER_KEY: ${{ secrets.DOCUMENTER_KEY }}
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
new file mode 100644
index 0000000..08b3911
--- /dev/null
+++ b/.github/workflows/docs.yml
@@ -0,0 +1,24 @@
+name: Documentation
+
+on:
+  push:
+    branches:
+      - master
+    tags: '*'
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@latest
+        with:
+          version: '1.10'
+      - name: Install dependencies
+        run: julia --project=docs/ -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()'
+      - name: Build and deploy
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # If authenticating with GitHub Actions token
+          DOCUMENTER_KEY: ${{ secrets.DOCUMENTER_KEY }} # If authenticating with SSH deploy key
+        run: julia --project=docs/ docs/make.jl
\ No newline at end of file
diff --git a/docs/make.jl b/docs/make.jl
index 2f8beeb..c1424a6 100644
--- a/docs/make.jl
+++ b/docs/make.jl
@@ -3,7 +3,6 @@ using Documenter, Functors
 DocMeta.setdocmeta!(Functors, :DocTestSetup, :(using Functors); recursive = true)
 
 makedocs(modules = [Functors],
-         doctest = false,
          sitename = "Functors.jl",
          pages = ["Home" => "index.md",
                   "API" => "api.md"],
diff --git a/docs/src/api.md b/docs/src/api.md
index 70dd2ff..2acdd5c 100644
--- a/docs/src/api.md
+++ b/docs/src/api.md
@@ -50,4 +50,5 @@ Functors.IterateWalk
 Functors.KeyPath
 Functors.haskeypath
 Functors.getkeypath
+Functors.setkeypath!
 ```
diff --git a/src/Functors.jl b/src/Functors.jl
index 71e0c8b..ffcbf8f 100644
--- a/src/Functors.jl
+++ b/src/Functors.jl
@@ -2,7 +2,7 @@ module Functors
 
 export @functor, @flexiblefunctor, fmap, fmapstructure, fcollect, execute, fleaves,
        fmap_with_path, fmapstructure_with_path,
-       KeyPath, getkeypath, haskeypath
+       KeyPath, getkeypath, haskeypath, setkeypath!
 
 include("functor.jl")
 include("keypath.jl")
diff --git a/src/keypath.jl b/src/keypath.jl
index f64be1d..280ef94 100644
--- a/src/keypath.jl
+++ b/src/keypath.jl
@@ -65,12 +65,14 @@ end
 
 Base.isempty(kp::KeyPath) = false
 Base.isempty(kp::KeyPath{Tuple{}}) = true
-Base.getindex(kp::KeyPath, i::Int) = kp.keys[i]
+Base.getindex(kp::KeyPath, i::Integer) = kp.keys[i]
+Base.getindex(kp::KeyPath, r::AbstractVector) = KeyPath(kp.keys[r])
+Base.last(kp::KeyPath) = last(kp.keys)
+Base.lastindex(kp::KeyPath) = lastindex(kp.keys)
 Base.length(kp::KeyPath) = length(kp.keys)
 Base.iterate(kp::KeyPath, state=1) = iterate(kp.keys, state)
-Base.:(==)(kp1::KeyPath, kp2::KeyPath) = kp1.keys == kp2.keys
 Base.tail(kp::KeyPath) = KeyPath(Base.tail(kp.keys))
-Base.last(kp::KeyPath) = last(kp.keys)
+Base.:(==)(kp1::KeyPath, kp2::KeyPath) = kp1.keys == kp2.keys
 
 function Base.show(io::IO, kp::KeyPath)
     compat = get(io, :compact, false)
@@ -88,6 +90,11 @@ _getkey(x, k::Symbol) = getproperty(x, k)
 _getkey(x::AbstractDict, k::Symbol) = x[k]
 _getkey(x, k::AbstractString) = x[k]
 
+_setkey!(x, k::Integer, v) = (x[k] = v)
+_setkey!(x, k::Symbol, v) = setproperty!(x, k, v)
+_setkey!(x::AbstractDict, k::Symbol, v) = (x[k] = v)
+_setkey!(x, k::AbstractString, v) = (x[k] = v)
+
 _haskey(x, k::Integer) = haskey(x, k)
 _haskey(x::Tuple, k::Integer) = 1 <= k <= length(x)
 _haskey(x::AbstractArray, k::Integer) = 1 <= k <= length(x) # TODO: extend to generic indexing
@@ -95,12 +102,13 @@ _haskey(x, k::Symbol) = k in propertynames(x)
 _haskey(x::AbstractDict, k::Symbol) = haskey(x, k)
 _haskey(x, k::AbstractString) = haskey(x, k)
 
+
 """
     getkeypath(x, kp::KeyPath)
 
 Return the value in `x` at the path `kp`.
 
-See also [`KeyPath`](@ref) and  [`haskeypath`](@ref).
+See also [`KeyPath`](@ref), [`haskeypath`](@ref), and [`setkeypath!`](@ref).
 
 # Examples
 ```jldoctest
@@ -126,14 +134,14 @@ end
 
 Return `true` if `x` has a value at the path `kp`.
 
-See also [`KeyPath`](@ref) and [`getkeypath`](@ref).
+See also [`KeyPath`](@ref), [`getkeypath`](@ref), and [`setkeypath!`](@ref).
 
 # Examples
 ```jldoctest
 julia> x = Dict(:a => 3, :b => Dict(:c => 4, "d" => [5, 6, 7]))
-Dict{Any,Any} with 2 entries:
+Dict{Symbol, Any} with 2 entries:
   :a => 3
-  :b => Dict{Any,Any}(:c=>4,"d"=>[5, 6, 7])
+  :b => Dict{Any, Any}(:c=>4, "d"=>[5, 6, 7])
 
 julia> haskeypath(x, KeyPath(:a))
 true
@@ -153,3 +161,19 @@ function haskeypath(x, kp::KeyPath)
         return _haskey(x, k) && haskeypath(_getkey(x, k), tail(kp))
     end
 end
+
+"""
+    setkeypath!(x, kp::KeyPath, v)
+
+Set the value in `x` at the path `kp` to `v`.
+
+See also [`KeyPath`](@ref), [`getkeypath`](@ref), and [`haskeypath`](@ref).
+"""
+function setkeypath!(x, kp::KeyPath, v)
+    if isempty(kp)
+        error("Empty keypath not allowed.")
+    end
+    y = getkeypath(x, kp[1:end-1])
+    k = kp[end]
+    return _setkey!(y, k, v)
+end
diff --git a/test/keypath.jl b/test/keypath.jl
index a206d53..a303a02 100644
--- a/test/keypath.jl
+++ b/test/keypath.jl
@@ -52,6 +52,21 @@
         end
     end
 
+    @testset "setkeypath!" begin
+        x = Dict(:a => 3, :b => Dict(:c => 4, "d" => [5, 6, 7]))
+        setkeypath!(x, KeyPath(:a), 4)
+        @test x[:a] == 4
+        setkeypath!(x, KeyPath(:b, "d", 1), 17)
+        @test x[:b]["d"][1] == 17
+        setkeypath!(x, KeyPath(:b, "d"), [0])
+        @test x[:b]["d"] == [0]
+        
+        x = Tkp(3, Tkp(4, 5, [6, 7]), 8)
+        kp = KeyPath(:b, :c, 2)
+        setkeypath!(x, kp, 17)
+        @test x.b.c[2] == 17
+    end
+
     @testset "haskeypath" begin
         x = Dict(:a => 3, :b => Dict(:c => 4, "d" => [5, 6, 7]))
         @test haskeypath(x, KeyPath(:a))
diff --git a/test/runtests.jl b/test/runtests.jl
index 99b0c02..7db1e1b 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -9,13 +9,4 @@ using StaticArrays
   include("base.jl")
   include("keypath.jl")
 
-  if VERSION < v"1.6" # || VERSION > v"1.7-"
-    @warn "skipping doctests, on Julia $VERSION"
-  else
-    using Documenter
-    @testset "doctests" begin
-      DocMeta.setdocmeta!(Functors, :DocTestSetup, :(using Functors); recursive=true)
-      doctest(Functors, manual=true)
-    end
-  end
 end