diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7a0a1f0..101d9c9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.6'
+          - '1.0'
           - '1'
           - 'nightly'
         os:
diff --git a/Project.toml b/Project.toml
index 0831a68..2f10e18 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,18 +1,23 @@
 name = "DiffResults"
 uuid = "163ba53b-c6d8-5494-b064-1a9d43ac40c5"
-version = "1.1.0"
+version = "1.0.3"
 
 [deps]
-StaticArraysCore = "1e83bf80-4336-4d27-bf5d-d5a4f845583c"
+StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
+
+[weakdeps]
+StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
+
+[extensions]
+StaticArraysExt = "StaticArrays"
 
 [compat]
-StaticArrays = "1.5.8"
-StaticArraysCore = "1.4.0"
-julia = "1.6"
+StaticArrays = "0.8, 0.9, 0.10, 0.11, 0.12, 1.0"
+julia = "1"
 
 [extras]
 StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["Test", "StaticArrays"]
+test = ["StaticArrays", "Test"]
diff --git a/ext/StaticArraysExt.jl b/ext/StaticArraysExt.jl
new file mode 100644
index 0000000..c96bd45
--- /dev/null
+++ b/ext/StaticArraysExt.jl
@@ -0,0 +1,25 @@
+module StaticArraysExt
+
+using DiffResults, StaticArrays
+
+import DiffResults: DiffResult, ImmutableDiffResult, GradientResult, JacobianResult, HessianResult, derivative!
+using DiffResults: value, tuple_setindex
+
+DiffResult(value::Number, derivs::Tuple{Vararg{StaticArray}}) = ImmutableDiffResult(value, derivs)
+DiffResult(value::StaticArray, derivs::Tuple{Vararg{StaticArray}}) = ImmutableDiffResult(value, derivs)
+
+GradientResult(x::StaticArray) = DiffResult(first(x), x)
+
+JacobianResult(x::StaticArray) = DiffResult(x, zeros(StaticArrays.similar_type(typeof(x), Size(length(x),length(x)))))
+JacobianResult(y::StaticArray, x::StaticArray) = DiffResult(y, zeros(StaticArrays.similar_type(typeof(x), Size(length(y),length(x)))))
+
+HessianResult(x::StaticArray) = DiffResult(first(x), x, zeros(StaticArrays.similar_type(typeof(x), Size(length(x),length(x)))))
+
+function derivative!(r::ImmutableDiffResult, x::Union{Number,StaticArray}, ::Type{Val{i}} = Val{1}) where {i}
+    return ImmutableDiffResult(value(r), tuple_setindex(r.derivs, x, Val{i}))
+end
+function derivative!(f, r::ImmutableDiffResult, x::StaticArray, ::Type{Val{i}} = Val{1}) where {i}
+    return derivative!(r, map(f, x), Val{i})
+end
+
+end
diff --git a/src/DiffResults.jl b/src/DiffResults.jl
index c440d50..8f24396 100644
--- a/src/DiffResults.jl
+++ b/src/DiffResults.jl
@@ -1,7 +1,5 @@
 module DiffResults
 
-using StaticArraysCore: StaticArray, similar_type, Size
-
 #########
 # Types #
 #########
@@ -45,8 +43,6 @@ Note that `derivs` can be provide in splatted form, i.e. `DiffResult(value, deri
 DiffResult
 
 DiffResult(value::Number, derivs::Tuple{Vararg{Number}}) = ImmutableDiffResult(value, derivs)
-DiffResult(value::Number, derivs::Tuple{Vararg{StaticArray}}) = ImmutableDiffResult(value, derivs)
-DiffResult(value::StaticArray, derivs::Tuple{Vararg{StaticArray}}) = ImmutableDiffResult(value, derivs)
 DiffResult(value::Number, derivs::Tuple{Vararg{AbstractArray}}) = MutableDiffResult(value, derivs)
 DiffResult(value::AbstractArray, derivs::Tuple{Vararg{AbstractArray}}) = MutableDiffResult(value, derivs)
 DiffResult(value::Union{Number,AbstractArray}, derivs::Union{Number,AbstractArray}...) = DiffResult(value, derivs)
@@ -62,7 +58,6 @@ shape information. If you want to allocate storage yourself, use the `DiffResult
 constructor instead.
 """
 GradientResult(x::AbstractArray) = DiffResult(first(x), similar(x))
-GradientResult(x::StaticArray) = DiffResult(first(x), x)
 
 """
     JacobianResult(x::AbstractArray)
@@ -76,7 +71,6 @@ shape information. If you want to allocate storage yourself, use the `DiffResult
 constructor instead.
 """
 JacobianResult(x::AbstractArray) = DiffResult(similar(x), similar(x, length(x), length(x)))
-JacobianResult(x::StaticArray) = DiffResult(x, zeros(similar_type(typeof(x), Size(length(x),length(x)))))
 
 """
     JacobianResult(y::AbstractArray, x::AbstractArray)
@@ -89,7 +83,6 @@ Like the single argument version, `y` and `x` are only used for type and
 shape information and are not stored in the returned `DiffResult`.
 """
 JacobianResult(y::AbstractArray, x::AbstractArray) = DiffResult(similar(y), similar(y, length(y), length(x)))
-JacobianResult(y::StaticArray, x::StaticArray) = DiffResult(y, zeros(similar_type(typeof(x), Size(length(y),length(x)))))
 
 """
     HessianResult(x::AbstractArray)
@@ -102,7 +95,6 @@ shape information. If you want to allocate storage yourself, use the `DiffResult
 constructor instead.
 """
 HessianResult(x::AbstractArray) = DiffResult(first(x), zeros(eltype(x), size(x)), similar(x, length(x), length(x)))
-HessianResult(x::StaticArray) = DiffResult(first(x), x, zeros(similar_type(typeof(x), Size(length(x),length(x)))))
 
 #############
 # Interface #
@@ -200,10 +192,6 @@ function derivative!(r::MutableDiffResult, x::AbstractArray, ::Type{Val{i}} = Va
     return r
 end
 
-function derivative!(r::ImmutableDiffResult, x::Union{Number,StaticArray}, ::Type{Val{i}} = Val{1}) where {i}
-    return ImmutableDiffResult(value(r), tuple_setindex(r.derivs, x, Val{i}))
-end
-
 function derivative!(r::ImmutableDiffResult, x::AbstractArray, ::Type{Val{i}} = Val{1}) where {i}
     T = tuple_eltype(r.derivs, Val{i})
     return ImmutableDiffResult(value(r), tuple_setindex(r.derivs, T(x), Val{i}))
@@ -229,10 +217,6 @@ function derivative!(f, r::ImmutableDiffResult, x::Number, ::Type{Val{i}} = Val{
     return derivative!(r, f(x), Val{i})
 end
 
-function derivative!(f, r::ImmutableDiffResult, x::StaticArray, ::Type{Val{i}} = Val{1}) where {i}
-    return derivative!(r, map(f, x), Val{i})
-end
-
 function derivative!(f, r::ImmutableDiffResult, x::AbstractArray, ::Type{Val{i}} = Val{1}) where {i}
     T = tuple_eltype(r.derivs, Val{i})
     return derivative!(r, map(f, T(x)), Val{i})
@@ -333,4 +317,8 @@ Base.show(io::IO, r::ImmutableDiffResult) = print(io, "ImmutableDiffResult($(r.v
 
 Base.show(io::IO, r::MutableDiffResult) = print(io, "MutableDiffResult($(r.value), $(r.derivs))")
 
+if !isdefined(Base, :get_extension)
+    include("../ext/StaticArraysExt.jl")
+end
+
 end # module