This research investigates the influence of regulation revisions on the diversity of gymnastics skill combinations. We employ network analysis and a random-effects model using the Japan gymnastics championships from 2013 to 2016. The analysis shows that stricter judgment of regulation revisions decreases the network constraints of skill and has a negative effect on decreasing the combination of skills. Additionally, a relaxation of judgment also promotes a decrease in the combination of skills. The results indicate that stricter judgment of regulation revisions promotes skill upgrades in maintaining the existing skill combinations and facilitates the creation of new skill combinations with decreasing network constraints. However, the relaxation of judgment promotes the disappearance of skill erosion.