Julia does not update its packages - julia

Question

I installed DifferentialEquations by using:
Pkg.add("DifferentialEquations")
Then I used the below line to check the version:
Pkg.status("DifferentialEquations")
It returns 1.0.0 while, it must be 4.0.0.
I tried Pkg.update() or Pkg.update("DifferentialEquations). However, the version is still 1.0.0 and re-installing Julia did not help neither.
What can be done to update the DifferentialEqautions package?
The version of Julia is 0.6.2.
Edit
This time I not only uninstalled Julia, but I also deleted its folder in appdata. After installing Julia again and adding the package, now it is up to date.

Answer 1

Have you tried :
Pkg.pin("DifferentialEquations",v"4.0.0")

Answer 2

You can force Pkg to find a solution by giving an explicit version.
For example, going from version 5 to version 6 of the DifferentialEquations package:
(TestProject) pkg> status
Status `/tmp/TestProject/Project.toml`
[0c46a032] DifferentialEquations v5.0.0
(TestProject) pkg> add DifferentialEquations#6.0.0
Resolving package versions...
Updating `/tmp/TestProject/Project.toml`
[0c46a032] ↑ DifferentialEquations v5.0.0 ⇒ v6.0.0
Updating `/tmp/TestProject/Manifest.toml`
[1520ce14] - AbstractTrees v0.2.1
[79e6a3ab] - Adapt v1.0.0
[4fba245c] ↓ ArrayInterface v2.3.1 ⇒ v0.1.1
[9e28174c] - BinDeps v1.0.0
...
(TestProject) pkg> status
Status `/tmp/TestProject/Project.toml`
[0c46a032] DifferentialEquations v6.0.0
The equivalent API syntax:
julia> import Pkg
julia> Pkg.add(Pkg.PackageSpec(; name="DifferentialEquations", version=v"6.0.0"))