diff --git a/build.gradle b/build.gradle
index 1c6411c..4b46849 100644
--- a/build.gradle
+++ b/build.gradle
@@ -22,8 +22,10 @@ ext {
 
     javaVersion=12
     
-    version_log4j2= '2.12.1'
-    version_spring = '2.2.3.RELEASE'
+    version_log4j2= '2.12.1' // keep in sync with spring-boot-starter-log4j2
+    version_spring = '2.2.4.RELEASE'
+    version_junit = '5.6.0'
+    version_junit_platform = '1.6.0'
     
     lib_antlr = "org.antlr:antlr4:4.8-1"
     
@@ -90,9 +92,9 @@ subprojects {
 	
 	// dependencies that all sub-projects have 
 	dependencies {
-    testImplementation 'org.junit.jupiter:junit-jupiter-engine:5.5.2'
-    testImplementation 'org.junit.jupiter:junit-jupiter-params:5.5.2'  // for @ParameterizedTest
-    testImplementation 'org.junit.platform:junit-platform-launcher:1.5.2' // needed by eclipse
+    testImplementation "org.junit.jupiter:junit-jupiter-engine:${version_junit}"
+    testImplementation "org.junit.jupiter:junit-jupiter-params:${version_junit}"  // for @ParameterizedTest
+    testImplementation "org.junit.platform:junit-platform-launcher:${version_junit_platform}" // needed by eclipse
   }
 	
    task eclipseSettings(type: Copy) {