diff --git a/README.md b/README.md
index f9965bae0..9e8432874 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,9 @@ Please check the list below for the specific syntax you need.
 
 ## Supported features
 
-* `get` supports `CartesianIndex` when indexing `AbstractArrays` ([#30259]). (since Compat 3.10.0)
+* `union` supports `Base.OneTo` ([#35577]). (since Compat 3.11.0)
+
+* `get` supports `CartesianIndex` when indexing `AbstractArrays` ([#30268]). (since Compat 3.10.0)
 
 * `similar(::PermutedDimsArray)` now uses the parent ([#35304]). (since Compat 3.9.0)
 
@@ -150,4 +152,5 @@ Note that you should specify the correct minimum version for `Compat` in the
 [#34652]: https://github.com/JuliaLang/julia/issues/34652
 [#34773]: https://github.com/JuliaLang/julia/issues/34773
 [#35304]: https://github.com/JuliaLang/julia/pull/35304
-[#30259]: https://github.com/JuliaLang/julia/pull/30268
+[#30268]: https://github.com/JuliaLang/julia/pull/30268
+[#35577]: https://github.com/JuliaLang/julia/pull/35577
diff --git a/src/Compat.jl b/src/Compat.jl
index 5452b4f04..34f59cc91 100644
--- a/src/Compat.jl
+++ b/src/Compat.jl
@@ -396,6 +396,11 @@ if VERSION < v"1.5.0-DEV.124"
     export isdisjoint
 end
 
+# https://github.com/JuliaLang/julia/pull/35577
+if VERSION < v"1.5.0-DEV.681"
+    Base.union(r::Base.OneTo, s::Base.OneTo) = Base.OneTo(max(r.stop,s.stop))
+end
+
 include("deprecated.jl")
 
 end # module Compat
diff --git a/test/runtests.jl b/test/runtests.jl
index 71caba318..1fdabeb57 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -400,4 +400,9 @@ end
     end
 end
 
+# https://github.com/JuliaLang/julia/pull/35577
+@testset "union on OneTo" begin
+    @test union(Base.OneTo(3), Base.OneTo(4)) === Base.OneTo(4)
+end
+
 nothing