diff --git a/.travis.yml b/.travis.yml
index 7f7f31a..fa45e08 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,8 +3,9 @@ language: julia
 os:
   - linux
 julia:
-  - 0.7
   - 1.0
+  - 1.1
+  - 1.2
   - nightly
 notifications:
   email: false
diff --git a/Manifest.toml b/Manifest.toml
new file mode 100644
index 0000000..8b25cfd
--- /dev/null
+++ b/Manifest.toml
@@ -0,0 +1,34 @@
+# This file is machine-generated - editing it directly is not advised
+
+[[IterTools]]
+git-tree-sha1 = "2ebe60d7343962966d1779a74a760f13217a6901"
+uuid = "c8e1da08-722c-5040-9ed9-7db0dc04731e"
+version = "1.2.0"
+
+[[Libdl]]
+uuid = "8f399da3-3557-5675-b5ff-fb832c97cbdb"
+
+[[LinearAlgebra]]
+deps = ["Libdl"]
+uuid = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
+
+[[Random]]
+deps = ["Serialization"]
+uuid = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
+
+[[Serialization]]
+uuid = "9e88b42a-f829-5b0c-bbe9-9e923198166b"
+
+[[SparseArrays]]
+deps = ["LinearAlgebra", "Random"]
+uuid = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
+
+[[StaticArrays]]
+deps = ["LinearAlgebra", "Random", "Statistics"]
+git-tree-sha1 = "db23bbf50064c582b6f2b9b043c8e7e98ea8c0c6"
+uuid = "90137ffa-7385-5640-81b9-e52037218182"
+version = "0.11.0"
+
+[[Statistics]]
+deps = ["LinearAlgebra", "SparseArrays"]
+uuid = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
diff --git a/Project.toml b/Project.toml
new file mode 100644
index 0000000..d9de5a8
--- /dev/null
+++ b/Project.toml
@@ -0,0 +1,21 @@
+name = "RegionTrees"
+uuid = "dee08c22-ab7f-5625-9660-a9af2021b33f"
+
+[deps]
+IterTools = "c8e1da08-722c-5040-9ed9-7db0dc04731e"
+LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
+StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
+
+[compat]
+Interpolations = "0.9, 0.10, 0.11, 0.12"
+IterTools = "1"
+StaticArrays = "0.5, 0.6, 0.7, 0.8, 0.9, 0.10, 0.11"
+julia = "1"
+
+[extras]
+Interpolations = "a98d9a8b-a2ab-59e6-89dd-64a1c18fca59"
+LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
+Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+
+[targets]
+test = ["LinearAlgebra", "Test", "Interpolations"]
diff --git a/REQUIRE b/REQUIRE
deleted file mode 100644
index cebc49b..0000000
--- a/REQUIRE
+++ /dev/null
@@ -1,3 +0,0 @@
-julia 0.7
-StaticArrays 0.5.1
-IterTools 0.1
diff --git a/src/cell.jl b/src/cell.jl
index 5974434..a1a7c2a 100644
--- a/src/cell.jl
+++ b/src/cell.jl
@@ -39,8 +39,10 @@ show(io::IO, cell::Cell) = print(io, "Cell: $(cell.boundary)")
 @inline getindex(cell::Cell, I...) = getindex(cell.children, I...)
 
 function child_boundary(cell::Cell, indices)
-    HyperRectangle(cell.boundary.origin + 0.5 * (SVector(indices) - 1) .* cell.boundary.widths,
-                   cell.boundary.widths / 2)
+    half_widths = cell.boundary.widths ./ 2
+    HyperRectangle(
+        cell.boundary.origin + (SVector(indices) - 1) .* half_widths,
+        half_widths)
 end
 
 @generated function map_children(f::Function, cell::Cell{Data, N, T, L}) where {Data, N, T, L}
diff --git a/test/cell.jl b/test/cell.jl
index f944349..9a7a2d5 100644
--- a/test/cell.jl
+++ b/test/cell.jl
@@ -44,7 +44,7 @@ end
 
 	@test parents2D[1] === cell2D[1,1]
 	@test parents2D[2] === cell2D
-	
+
 	cell3D = Cell(SVector(-1., -2, -3), SVector(2., 4, 6), 0)
 	split!(cell3D)
 	split!(cell3D[2,2,2])
@@ -52,7 +52,14 @@ end
 
 	@test parents3D[1] === cell3D[2,2,2]
 	@test parents3D[2] === cell3D
-	
+
 	noparents = [p for p in allparents(cell2D)]
 	@test length(noparents) == 0
-end
\ No newline at end of file
+end
+
+@testset "non-float64 types" begin
+    # https://github.com/rdeits/RegionTrees.jl/pull/22
+    root = Cell(SVector(0f0, 0f0, 0f0), SVector(1f0, 1f0, 1f0))
+    split!(root)
+    @test length(root.children) == 8
+end