README.md: Reflect max Gradle of 6.9.
@@ -12,11 +12,13 @@ The bitcoinj library is a Java implementation of the Bitcoin protocol, which all
### Technologies
* Java 7+ and Gradle 4.4+ for the `core` module
-* Java 8+ and Gradle 4.4+ for `tools` and `examples`
-* Java 11+ and Gradle 4.10+ for the JavaFX-based `wallettemplate`
+* Java 8+ and Gradle 4.4 - Gradle 6.9 for `tools` and `examples`
+* Java 11+ and Gradle 4.10 - Gradle 6.9 for the JavaFX-based `wallettemplate`
* [Gradle](https://gradle.org/) - for building the project
* [Google Protocol Buffers](https://github.com/google/protobuf) - for use with serialization and hardware communications
+Note: Building with Gradle 7 is currently unsupported. See Issue #2112 and Issue #2119.
+
### Getting started
To get started, it is best to have the latest JDK and Gradle installed. The HEAD of the `master` branch contains the latest development code and various production releases are provided on feature branches.
