diff --git a/build.gradle b/build.gradle
index ef4f0919faae48e2106eaa553d58ea1e76a61096..72cb67b4790cc39b9b4172a7519052df139c2016 100644
--- a/build.gradle
+++ b/build.gradle
@@ -3,14 +3,14 @@
  *
  * This generated file contains a sample Java project to get you started.
  * For more details take a look at the Java Quickstart chapter in the Gradle
- * User Manual available at https://docs.gradle.org/5.6.1/userguide/tutorial_java_projects.html
+ * User Manual available at https://docs.gradle.org/6.3/userguide/tutorial_java_projects.html
  */
 
 plugins {
     // Apply the java plugin to add support for Java
     id 'java'
 
-    // Apply the application plugin to add support for building a CLI application
+    // Apply the application plugin to add support for building a CLI application.
     id 'application'
 }
 
@@ -22,17 +22,17 @@ repositories {
 
 dependencies {
     // This dependency is used by the application.
-    implementation 'com.google.guava:guava:28.0-jre'
+    implementation 'com.google.guava:guava:28.2-jre'
 
     // Use JUnit Jupiter API for testing.
-    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.4.2'
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.6.0'
 
     // Use JUnit Jupiter Engine for testing.
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.4.2'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.6.0'
 }
 
 application {
-    // Define the main class for the application
+    // Define the main class for the application.
     mainClassName = 'io.fp.campus.App'
 }
 
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 5c2d1cf016b3885f6930543d57b744ea8c220a1a..490fda8577df6c95960ba7077c43220e5bb2c0d9 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 59b5f89288842bf8ef144d802e597dcf482b3d70..a4b4429748d92848a3d820c7b099fbeb941066ae 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-5.6.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
index 83f2acfdc319a24e8766cca78f32474ad7a22dd6..2fe81a7d95e4f9ad2c9b2a046707d36ceb3980b3 100644
--- a/gradlew
+++ b/gradlew
@@ -154,19 +154,19 @@ if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
         else
             eval `echo args$i`="\"$arg\""
         fi
-        i=$((i+1))
+        i=`expr $i + 1`
     done
     case $i in
-        (0) set -- ;;
-        (1) set -- "$args0" ;;
-        (2) set -- "$args0" "$args1" ;;
-        (3) set -- "$args0" "$args1" "$args2" ;;
-        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
     esac
 fi
 
@@ -175,14 +175,9 @@ save () {
     for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
     echo " "
 }
-APP_ARGS=$(save "$@")
+APP_ARGS=`save "$@"`
 
 # Collect all arguments for the java command, following the shell quoting and substitution rules
 eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
 
-# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
-if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
-  cd "$(dirname "$0")"
-fi
-
 exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
index 9618d8d9607cd91a0efb866bcac4810064ba6fac..62bd9b9ccefea2b65ae41e5d9a545e2021b90a1d 100644
--- a/gradlew.bat
+++ b/gradlew.bat
@@ -29,6 +29,9 @@ if "%DIRNAME%" == "" set DIRNAME=.
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
 @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
 
diff --git a/settings.gradle b/settings.gradle
index 6a003264b9658661ddb65a9c3f50efb2a1c4491d..43621cc760e4afdf4cb9308dd5ac963f116b471d 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -4,7 +4,7 @@
  * The settings file is used to specify which projects to include in your build.
  *
  * Detailed information about configuring a multi-project build in Gradle can be found
- * in the user manual at https://docs.gradle.org/5.6.1/userguide/multi_project_builds.html
+ * in the user manual at https://docs.gradle.org/6.3/userguide/multi_project_builds.html
  */
 
 rootProject.name = 'campus'