Following an examination of the principles governing public contracts and their hierarchy as codified in Legislative Decree 36/2023, the author focuses on the relationship between the public administration's liability and the good faith principle, examining the legal implications of the former on the latter. Specifically, it is stated that by broadening the range of legal problems that can be resolved in connection with public procurement, Article 5 c. 2 of the new Code keeps the process of "civilising" administrative law going. This procedure, however, may hit a roadblock in the form of c. 3, which designates as "culpable" the reliance that was fostered in the face of a "easily detectable" illegitimacy.