diff --git a/build.gradle b/build.gradle
index 7054fb5c09..dce3df08d7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -143,7 +143,7 @@ subprojects {
         all {
             resolutionStrategy {
                 force "commons-io:commons-io:${commonsIoVersion}"
-                force 'org.slf4j:slf4j-api:1.7.33'
+                force 'org.slf4j:slf4j-api:1.7.34'
                 force 'com.fasterxml.woodstox:woodstox-core:6.2.8'
             }
         }
diff --git a/build.xml b/build.xml
index b4ee774e7f..0edb9c861b 100644
--- a/build.xml
+++ b/build.xml
@@ -337,7 +337,7 @@ under the License.
     <dependency prefix="ooxml.test.reflections" artifact="org.reflections:reflections:0.10.2" usage="ooxml-tests"/>
     <dependency prefix="ooxml.test.guava" artifact="com.google.guava:guava:30.1-jre" usage="ooxml-tests"/>
     <dependency prefix="ooxml.test.javassist" artifact="org.javassist:javassist:3.27.0-GA" usage="ooxml-tests"/>
-    <dependency prefix="ooxml.test.slf4j-api" artifact="org.slf4j:slf4j-api:1.7.33" usage="ooxml-tests"/>
+    <dependency prefix="ooxml.test.slf4j-api" artifact="org.slf4j:slf4j-api:1.7.34" usage="ooxml-tests"/>
 
     <!-- coverage libs -->
     <dependency prefix="jacoco" artifact="org.jacoco:jacoco:0.8.6" usage="util" packaging="zip"/>
diff --git a/poi-excelant/build.gradle b/poi-excelant/build.gradle
index a4dcedce2b..c07db31d9e 100644
--- a/poi-excelant/build.gradle
+++ b/poi-excelant/build.gradle
@@ -47,7 +47,7 @@ dependencies {
     }
     testImplementation 'com.google.guava:guava:31.0.1-jre'
     testImplementation "org.apache.logging.log4j:log4j-slf4j18-impl:${log4jVersion}"
-    testImplementation 'org.slf4j:slf4j-simple:1.7.33'
+    testImplementation 'org.slf4j:slf4j-simple:1.7.34'
     testRuntimeOnly "org.apiguardian:apiguardian-api:${apiGuardianVersion}"
 
     if (SAXON_TEST) {
diff --git a/poi-integration/build.gradle b/poi-integration/build.gradle
index ec859eac36..1521fc095d 100644
--- a/poi-integration/build.gradle
+++ b/poi-integration/build.gradle
@@ -78,7 +78,7 @@ dependencies {
     }
     testImplementation project(path: ':poi-ooxml-lite-agent', configuration: 'archives')
     testImplementation "org.apache.logging.log4j:log4j-slf4j18-impl:${log4jVersion}"
-    testImplementation 'org.slf4j:slf4j-simple:1.7.33'
+    testImplementation 'org.slf4j:slf4j-simple:1.7.34'
     testRuntimeOnly "org.apiguardian:apiguardian-api:${apiGuardianVersion}"
 
     if (SAXON_TEST) {
diff --git a/poi-ooxml/build.gradle b/poi-ooxml/build.gradle
index 9674b6ff9a..651341ea42 100644
--- a/poi-ooxml/build.gradle
+++ b/poi-ooxml/build.gradle
@@ -144,7 +144,7 @@ dependencies {
     // prevent slf4j warnings coming from xmlsec -> slf4j-api 1.7.x dependency
     // see https://logging.apache.org/log4j/2.x/log4j-slf4j-impl/
     testImplementation "org.apache.logging.log4j:log4j-slf4j18-impl:${log4jVersion}"
-    testImplementation 'org.slf4j:slf4j-simple:1.7.33'
+    testImplementation 'org.slf4j:slf4j-simple:1.7.34'
 
     if (SAXON_TEST) {
         testRuntimeOnly "net.sf.saxon:Saxon-HE:${saxonVersion}"