Can't install with nimble: nimterop versions

[pmetras]

Trying to install golden with nimble, to use it with nim 1.4, raise an install error on nimterop versions:

$ nimble install golden --verbose | grep -B 5 -A 2 nimterop
    Reading official package list
   Checking for nimgit2@>= 0.3.1 & < 0.4.0
      Info: Dependency on nimgit2@>= 0.3.1 & < 0.4.0 already satisfied
  Verifying dependencies for [email protected]
    Reading official package list
   Checking for nimterop@>= 0.6.3
      Info: Dependency on nimterop@>= 0.6.3 already satisfied
  Verifying dependencies for [email protected]
    Reading official package list
   Checking for regex@>= 0.15.0
--
    Reading official package list
   Checking for https://github.com/disruptek/badresults@< 2.0.0
      Info: Dependency on https://github.com/disruptek/badresults@< 2.0.0 already satisfied
  Verifying dependencies for [email protected]
    Reading official package list
   Checking for nimterop@<= 0.6.12
      Info: Dependency on nimterop@<= 0.6.12 already satisfied
  Verifying dependencies for [email protected]
    Reading official package list
   Checking for regex@>= 0.15.0
--
  Verifying dependencies for [email protected]
    Reading official package list
   Checking for unicodedb@>= 0.8.0
      Info: Dependency on unicodedb@>= 0.8.0 already satisfied
  Verifying dependencies for [email protected]
     Error: Cannot satisfy the dependency on nimterop 0.6.12 and nimterop 0.6.13

I can't find which package requires nimterop 0.6.12 and why such a version restriction has been set.