Iris 1.6.6 has released, updating to Sodium 0.5.1, fixing some dimension related issues, and adding minor features for shader pack devs.
Download it from irisshaders.dev or Modrinth.
Developer information
Projects on Modrinth are automatically available through a Maven repository for use with JVM build tools such as Gradle.
maven { name = "Modrinth"; url = "https://api.modrinth.com/maven" }