diff --git a/Project.toml b/Project.toml
index 26bbea2..aa7ca29 100644
--- a/Project.toml
+++ b/Project.toml
@@ -4,7 +4,6 @@ repo = "https://github.com/JuliaAlgebra/DynamicPolynomials.jl.git"
 version = "0.6.4"
 
 [deps]
-Future = "9fa8497b-333b-5362-9e8d-4d0656e87820"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 MultivariatePolynomials = "102ac46a-7ee4-5c85-9060-abc95bfdeaa3"
 MutableArithmetics = "d8a4904e-b15c-11e9-3269-09a3773c0cb0"
diff --git a/src/DynamicPolynomials.jl b/src/DynamicPolynomials.jl
index b6a75b1..889877b 100644
--- a/src/DynamicPolynomials.jl
+++ b/src/DynamicPolynomials.jl
@@ -1,7 +1,5 @@
 module DynamicPolynomials
 
-import Future # For `copy!`
-
 using Reexport
 @reexport using MultivariatePolynomials
 import MultivariatePolynomials as MP
diff --git a/src/mono.jl b/src/mono.jl
index 1fe95a0..d5b5a87 100644
--- a/src/mono.jl
+++ b/src/mono.jl
@@ -120,7 +120,7 @@ function __add_variables!(
     allvars::Vector{Variable{V,M}},
     map,
 ) where {V,M}
-    Future.copy!(mono.vars, allvars)
+    copy!(mono.vars, allvars)
     tmp = copy(mono.z)
     resize!(mono.z, length(allvars))
     fill!(mono.z, 0)
diff --git a/src/monomial_vector.jl b/src/monomial_vector.jl
index 4f3520b..95458e1 100644
--- a/src/monomial_vector.jl
+++ b/src/monomial_vector.jl
@@ -396,11 +396,11 @@ function __add_variables!(
     allvars::Vector{Variable{V,M}},
     map,
 ) where {V,M}
-    Future.copy!(monos.vars, allvars)
+    copy!(monos.vars, allvars)
     if !isempty(monos.Z)
         tmp = similar(first(monos.Z))
         for z in monos.Z
-            Future.copy!(tmp, z)
+            copy!(tmp, z)
             resize!(z, length(allvars))
             fill!(z, 0)
             z[map] = tmp
diff --git a/src/mult.jl b/src/mult.jl
index bd63732..e422a4f 100644
--- a/src/mult.jl
+++ b/src/mult.jl
@@ -145,9 +145,9 @@ function MA.operate_to!(
         MP.mul_to_terms!(ts, q1, q2)
         # TODO do better than create tmp
         tmp = polynomial!(ts)
-        Future.copy!(p.a, tmp.a)
-        Future.copy!(p.x.vars, tmp.x.vars)
-        Future.copy!(p.x.Z, tmp.x.Z)
+        copy!(p.a, tmp.a)
+        copy!(p.x.vars, tmp.x.vars)
+        copy!(p.x.Z, tmp.x.Z)
         return p
     end
 end
diff --git a/src/operators.jl b/src/operators.jl
index cbe67b7..607fb65 100644
--- a/src/operators.jl
+++ b/src/operators.jl
@@ -85,7 +85,7 @@ function MA.operate_to!(
     end
     varsvec = [MP.variables(p), MP.variables(q)]
     allvars, maps = mergevars(varsvec)
-    Future.copy!(output.x.vars, allvars)
+    copy!(output.x.vars, allvars)
     empty!(output.a)
     empty!(output.x.Z)
     _plusorminus_to!(output.a, output.x.Z, op, p, q, maps, length(allvars))
diff --git a/src/poly.jl b/src/poly.jl
index 119d608..f2b74d7 100644
--- a/src/poly.jl
+++ b/src/poly.jl
@@ -252,7 +252,7 @@ function polynomialclean_to!(
     adup::Vector{T},
     Zdup::Vector{Vector{Int}},
 ) where {V,M,T}
-    Future.copy!(p.x.vars, vars)
+    copy!(p.x.vars, vars)
     empty!(p.a)
     empty!(p.x.Z)
     removedups_to!(p.a, p.x.Z, adup, Zdup, M)
@@ -374,7 +374,7 @@ function MP.map_coefficients_to!(
 )
     resize!(output.a, length(p.a))
     map!(f, output.a, p.a)
-    Future.copy!(output.x.vars, p.x.vars)
+    copy!(output.x.vars, p.x.vars)
     # TODO reuse the part of `Z` that is already in `output`.
     resize!(output.x.Z, length(p.x.Z))
     for i in eachindex(p.x.Z)
diff --git a/src/subs.jl b/src/subs.jl
index 468f1cd..66e179b 100644
--- a/src/subs.jl
+++ b/src/subs.jl
@@ -101,7 +101,7 @@ function _subsmap(
     # Some variable may not be replaced
     vals =
         Vector{promote_type(_substype(s), Variable{V,M})}(undef, length(vars))
-    Future.copy!(vals, vars)
+    copy!(vals, vars)
     fillmap!(vals, vars, s...)
     return vals
 end