diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
index 66c244f0..2c18f108 100644
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1
         with:
-          version: '1.9'
+          version: '1.10'
       - name: Install dependencies
         run: julia --project=docs/ -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()'
       - name: Build and deploy
diff --git a/src/fastgtpsa/temptps.jl b/src/fastgtpsa/temptps.jl
index 4d33ebf6..893bf6f2 100644
--- a/src/fastgtpsa/temptps.jl
+++ b/src/fastgtpsa/temptps.jl
@@ -129,6 +129,9 @@ end
 
 # --- overloads for broadcasting compatibility ---
 Base.broadcastable(o::TempTPS) = Ref(o)
+# NOTE: for some reason, merely overloading this function causes allocations 
+# in Julia 1.9. This is not the case in 1.10, so presumably this is a bug.
+# Therefore, allocation tests only are performed on >=1.10
 function Base.setindex!(A::Array{T}, x::TempTPS, i1::Int) where {T<:TPS}
   copy!(A[i1], x)
   rel_temp!(x)
diff --git a/test/runtests.jl b/test/runtests.jl
index a3b3b38d..9b9f90c7 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1510,8 +1510,9 @@ end
   @test_opt benchmark_GTPSA3()
 end
 
-# allocations only works on 1.10
-# maybe 1.9 includes the macro call allocations?
+# NOTE: for some reason merely overloading Base.setindex!(A::Array{T}, x::TempTPS, i1::Int) where {T<:TPS},
+# in Julia 1.9 causes allocations. This is not the case in 1.10, so presumably this is a bug.
+# Therefore, allocation tests only are performed on >=1.10
 if VERSION >= v"1.10"
 
 @testset "FastGTPSA - Allocations" begin