diff --git a/book/pom.xml b/book/pom.xml
index 07efeb4..7c64f10 100644
--- a/book/pom.xml
+++ b/book/pom.xml
@@ -249,7 +249,7 @@ along with semanticcms-dia-taglib.  If not, see <https://www.gnu.org/licenses/>.
         <groupId>com.semanticcms</groupId><artifactId>semanticcms-tag-reference</artifactId><version>2.0.0-SNAPSHOT<!-- ${POST-SNAPSHOT} --></version>
       </dependency>
       <dependency>
-        <groupId>com.github.spotbugs</groupId><artifactId>spotbugs-annotations</artifactId><version>4.8.3</version>
+        <groupId>com.github.spotbugs</groupId><artifactId>spotbugs-annotations</artifactId><version>4.8.4</version>
       </dependency>
       <!-- javaee-web-api-bom: <groupId>org.apache.taglibs</groupId><artifactId>taglibs-standard-spec</artifactId> -->
       <!-- Transitive -->