diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e272eaf..f0ad6e7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.6'
+          - 'lts'
           - '1' # automatically expands to the latest stable 1.x release of Julia
           - 'nightly'
         os:
@@ -27,12 +27,12 @@ jobs:
             version: '1'
             arch: x86
     steps:
-      - uses: actions/checkout@v2
-      - uses: julia-actions/setup-julia@v1
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v3
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: actions/cache@v1
+      - uses: actions/cache@v4
         env:
           cache-name: cache-artifacts
         with:
@@ -45,9 +45,9 @@ jobs:
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v1
+      - uses: codecov/codecov-action@v5
         with:
-          file: lcov.info
+          files: lcov.info
   # docs:
   #   name: Documentation
   #   runs-on: ubuntu-latest
diff --git a/Project.toml b/Project.toml
index 96a33e9..24b393f 100644
--- a/Project.toml
+++ b/Project.toml
@@ -15,7 +15,7 @@ StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 test = ["Test", "StaticArrays"]
 
 [compat]
-julia = "1"
+julia = "1.10"
 Indexing = "1.1"
 Dictionaries = "0.3, 0.4"
 StaticArrays = "1"
diff --git a/src/SplitApplyCombine.jl b/src/SplitApplyCombine.jl
index 11de0d2..ad39f9e 100644
--- a/src/SplitApplyCombine.jl
+++ b/src/SplitApplyCombine.jl
@@ -7,12 +7,6 @@ import Dictionaries: filterview
 
 import Base: merge, merge!, size, IndexStyle, getindex, parent, axes, iterate
 
-# collections -> scalar
-if VERSION < v"1.4.0-DEV"
-    export only
-    include("only.jl")
-end
-
 # collections -> collections
 export mapmany, mapview, MappedIterator, MappedArray, product, productview, ProductArray, filterview
 
@@ -40,17 +34,4 @@ include("splitdims.jl")
 include("combinedims.jl")
 include("invert.jl")
 
-# Silly definitions missing from Base
-# (defining them here is piracy)
-# ===================================
-
-if !hasmethod(Base.haskey, (Any, Any))
-    Base.haskey(a, i) = i ∈ keys(a)
-end
-
-if VERSION < v"1.2"
-    keytype(a::AbstractArray) = eltype(keys(a))
-    keytype(a) = Base.keytype(a)
-end
-
 end # module
diff --git a/src/only.jl b/src/only.jl
deleted file mode 100644
index c51d1df..0000000
--- a/src/only.jl
+++ /dev/null
@@ -1,22 +0,0 @@
-function only(iter)
-    i = iterate(iter)
-    if i === nothing
-        throw(ArgumentError("Collection must have exactly one element (input is empty)"))
-    end
-    (out, state) = i
-    if iterate(iter, state) === nothing
-        return out
-    else
-        throw(ArgumentError("Collection must have exactly one element (input contains more than one element)"))
-    end
-end
-
-function only(::Tuple{})
-    throw(ArgumentError("Collection must have exactly one element (input is empty)"))
-end
-function only(t::Tuple{Any})
-    return t[1]
-end
-function only(::NTuple{N,Any}) where N
-    throw(ArgumentError("Collection must have exactly one element (input has $N elements)"))
-end
diff --git a/test/product.jl b/test/product.jl
index 276214a..f98bba2 100644
--- a/test/product.jl
+++ b/test/product.jl
@@ -2,11 +2,7 @@
     @test @inferred(product(*, [1,2], [1,2,3]))::Matrix{Int} == [1 2 3; 2 4 6]
     @test @inferred(product(*, [1.0,2.0], [1,2,3]))::Matrix{Float64} == [1.0 2.0 3.0; 2.0 4.0 6.0]
     @test isequal(product(*, [1.0,2.0], [1,2,missing]), [1.0 2.0 missing; 2.0 4.0 missing])
-    if VERSION >= v"1.1"  # can infer same test from v1.1
-        @test isequal(@inferred(product(*, [1.0,2.0], [1,2,missing]))::Matrix{Union{Missing, Float64}}, [1.0 2.0 missing; 2.0 4.0 missing])
-    else
-        @test_broken isequal(@inferred(product(*, [1.0,2.0], [1,2,missing]))::Matrix{Union{Missing, Float64}}, [1.0 2.0 missing; 2.0 4.0 missing])
-    end
+    @test isequal(@inferred(product(*, [1.0,2.0], [1,2,missing]))::Matrix{Union{Missing, Float64}}, [1.0 2.0 missing; 2.0 4.0 missing])
 
     @test @inferred(product(+, fill(1), fill(1)))::Array{Int, 0} == fill(2)
     @test @inferred(product(+, [0,1,2], fill(1)))::Array{Int, 1} == [1,2,3]
@@ -20,11 +16,7 @@ end
     @test @inferred(productview(*, [1,2], [1,2,3]))::ProductArray{Int,2} == [1 2 3; 2 4 6]
     @test @inferred(productview(*, [1.0,2.0], [1,2,3]))::ProductArray{Float64,2} == [1.0 2.0 3.0; 2.0 4.0 6.0]
     @test isequal(productview(*, [1.0,2.0], [1,2,missing])::ProductArray, [1.0 2.0 missing; 2.0 4.0 missing])
-    if VERSION >= v"1.1"  # can infer same test from v1.1
-        @test isequal(@inferred(productview(*, [1.0,2.0], [1,2,missing]))::ProductArray{Union{Missing, Float64},2}, [1.0 2.0 missing; 2.0 4.0 missing])
-    else
-        @test_broken isequal(@inferred(productview(*, [1.0,2.0], [1,2,missing]))::ProductArray{Union{Missing, Float64},2}, [1.0 2.0 missing; 2.0 4.0 missing])
-    end
+    @test isequal(@inferred(productview(*, [1.0,2.0], [1,2,missing]))::ProductArray{Union{Missing, Float64},2}, [1.0 2.0 missing; 2.0 4.0 missing])
 
     @test @inferred(productview(+, fill(1), fill(1)))::ProductArray{Int, 0} == fill(2)
     @test @inferred(productview(+, [0,1,2], fill(1)))::ProductArray{Int, 1} == [1,2,3]