Add assertj.version property to the main pom.xml
<!-- used only in dependency management to force this version, not included as a direct dependency -->
<junit.version>4.13.2</junit.version>
+ <assertj.version>3.21.0</assertj.version>
<hamcrest.version>2.2</hamcrest.version>
<hamcrest-all.version>1.3</hamcrest-all.version>
<mockito.version>3.3.0</mockito.version>
