My Fladle extension config:

fladle {
    ....
    flankVersion("6.2.0")
    ....
}

Then, I run my tests:

./gradlew runFlank

Expectation: Gradle Build Scan shows a dependency on flank:flank:6.2.0. Flank v6.2.0 is invoked
Actual results: Gradle Build Scan shows a dependency on flank:flank:5.1.0, which appears to be the default value.

I've also tried v6.2.0 and banana, neither of which provided any different results. Flank 5.1.0 is always used.

My environment:
Fladle 0.6.2, Gradle 5.4.1, macOS Mojave 10.14.5