diff --git a/.travis.yml b/.travis.yml
index 454145eea8..8a1ea4f73f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,14 +8,40 @@ matrix:
     # using `openjdk8` leads to javadoc errors
     jdk: oraclejdk8
     dist: trusty # oraclejdk8 absent in Xenial
-  - name: OpenJDK 11
-    jdk: openjdk11
+  - name: AdoptOpenJDK 11
+    before_install:
+      - echo $JAVA_HOME
+      - which java
+      - wget -qO - https://adoptopenjdk.jfrog.io/adoptopenjdk/api/gpg/key/public | sudo apt-key add -
+      - sudo add-apt-repository --yes https://adoptopenjdk.jfrog.io/adoptopenjdk/deb/
+      - sudo apt-get update
+      - sudo apt-get install adoptopenjdk-11-hotspot
+      - export JAVA_HOME=/usr/lib/jvm/adoptopenjdk-11-hotspot-amd64/
+      - export PATH=$JAVA_HOME/bin:$PATH
+      - which java
+      - java -version
+      - $JAVA_HOME/bin/java -version
+
+
 env:
   global:
   - TERM=dumb         # for gradle
 
 install: true
+#before_install:
+#  - echo $JAVA_HOME
+#  - which java
+#  - wget -qO - https://adoptopenjdk.jfrog.io/adoptopenjdk/api/gpg/key/public | sudo apt-key add -
+#  - sudo add-apt-repository --yes https://adoptopenjdk.jfrog.io/adoptopenjdk/deb/
+#  - sudo apt-get update
+#  - sudo apt-get install adoptopenjdk-11-hotspot
+#  - export JAVA_HOME=/usr/lib/jvm/adoptopenjdk-11-hotspot-amd64/
+#  - export PATH=$JAVA_HOME/bin:$PATH
+#  - which java
+#  - java -version
+#  - $JAVA_HOME/bin/java -version
 script:
+- ./gradlew -v
 - ./gradlew clean build --stacktrace
 
 # cobbled together from
diff --git a/build.gradle b/build.gradle
index 991939abbe..e172a9d91a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -79,7 +79,7 @@ subprojects {
     JUNIT: 'junit:junit:4.13',
     MAVEN_TESTING_HARNESS: 'org.apache.maven.plugin-testing:maven-plugin-testing-harness:3.3.0',
     MAVEN_VERIFIER: 'org.apache.maven.shared:maven-verifier:1.7.2',
-    MOCKITO_CORE: 'org.mockito:mockito-core:3.4.6',
+    MOCKITO_CORE: 'org.mockito:mockito-core:3.5.7',
     SISU_PLEXUS: 'org.eclipse.sisu:org.eclipse.sisu.plexus:0.3.4',
     SLF4J_API: 'org.slf4j:slf4j-api:1.7.30',
     SLF4J_SIMPLE: 'org.slf4j:slf4j-simple:1.7.30',