diff --git a/build.gradle b/build.gradle
index b32f8feb43123529f88c8f1860fa4990a026b5f7..b500675302032e9d073e9b004158bd60ef888ab8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -27,7 +27,7 @@ dependencies {
     testCompile 'org.assertj:assertj-core:3.12.1'
     compile 'com.fasterxml.jackson.core:jackson-core:2.9.8'
     compile 'com.fasterxml.jackson.core:jackson-databind:2.9.8'
-    runtime 'org.jastadd:jastadd:2.3.2'
+    runtime 'org.jastadd:jastadd:2.3.4'
     compile group: 'net.sf.beaver', name: 'beaver-rt', version: '0.9.11'
     compile group: 'org.apache.logging.log4j', name: 'log4j-api', version: '2.10.0'
     compile group: 'org.apache.logging.log4j', name: 'log4j-core', version: '2.10.0'
@@ -337,5 +337,4 @@ clean {
 
 test {
     outputs.upToDateWhen { false }
-    useJUnitPlatform()
 }
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 01b8bf6b1f99cad9213fc495b33ad5bbab8efd20..94336fcae912db8a11d55634156fa011f4686124 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 1d5b29fbd59593cbadef9e8c2f5129d1d4391584..5028f28f8e4755a78a5bf0fef4644577b199c8c4 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.3-bin.zip