The D.L. 32/2019 (so-called "Sblocca Cantieri" decree), after a "troubled" procedure, was converted into a law!
It is the Official Journal which provides for the entry into force of the provision from 18 June 2019, to sanction the conversion of the
Decree with Law 55/2019.
This consists of a substantial simplification of the requirements for public procurement, in order to re-launch the public contracts sector. 
New thresholds and negotiated procedures for works, services and supplies tenders are established.
It is also possible to subcontract up to 40% of the value of the contract as a whole.