Enforce SpotBugs.
diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 204e3a5..7574118 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -32,4 +32,4 @@
       with:
         java-version: ${{ matrix.java }}
     - name: Build with Maven
-      run: mvn -V apache-rat:check javadoc:javadoc -Ddoclint=all package --file pom.xml
+      run: mvn -V apache-rat:check spotbugs:check javadoc:javadoc -Ddoclint=all package --file pom.xml
diff --git a/.travis.yml b/.travis.yml
index 1e3de86..c419c93 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -30,4 +30,4 @@
   - mvn
 
 after_success:
-  - mvn clean test jacoco:report coveralls:report -Ptravis-jacoco
+  - mvn clean test spotbugs:check jacoco:report coveralls:report -Ptravis-jacoco