diff --git a/build.gradle.kts b/build.gradle.kts
index 6aa48b2dd..e251ee2f9 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -31,7 +31,7 @@ dependencies {
 	compileOnly("org.apache.ant:ant:1.10.14")
 
 	testImplementation("io.github.glytching:junit-extensions:2.6.0")
-	testImplementation("org.assertj:assertj-core:3.24.2")
+	testImplementation("org.assertj:assertj-core:3.25.3")
 	testImplementation("org.junit.jupiter:junit-jupiter:5.10.1")
 	testImplementation("org.xmlunit:xmlunit-core:2.9.+")
 	if (JavaVersion.current().isJava8) {
diff --git a/plantuml-asl/build.gradle.kts b/plantuml-asl/build.gradle.kts
index b27324b28..d6ed938b7 100644
--- a/plantuml-asl/build.gradle.kts
+++ b/plantuml-asl/build.gradle.kts
@@ -25,7 +25,7 @@ java {
 
 dependencies {
 	compileOnly("org.apache.ant:ant:1.10.14")
-	testImplementation("org.assertj:assertj-core:3.24.2")
+	testImplementation("org.assertj:assertj-core:3.25.3")
 	testImplementation("org.junit.jupiter:junit-jupiter:5.10.1")
 	testImplementation("org.scilab.forge:jlatexmath:1.0.7")
 	testImplementation("org.xmlunit:xmlunit-core:2.9.+")
diff --git a/plantuml-bsd/build.gradle.kts b/plantuml-bsd/build.gradle.kts
index f57ec2fe1..63ae98403 100644
--- a/plantuml-bsd/build.gradle.kts
+++ b/plantuml-bsd/build.gradle.kts
@@ -25,7 +25,7 @@ java {
 
 dependencies {
 	compileOnly("org.apache.ant:ant:1.10.14")
-	testImplementation("org.assertj:assertj-core:3.24.2")
+	testImplementation("org.assertj:assertj-core:3.25.3")
 	testImplementation("org.junit.jupiter:junit-jupiter:5.10.1")
 	testImplementation("org.scilab.forge:jlatexmath:1.0.7")
 }
diff --git a/plantuml-epl/build.gradle.kts b/plantuml-epl/build.gradle.kts
index 5d0683378..eb88ac5ec 100644
--- a/plantuml-epl/build.gradle.kts
+++ b/plantuml-epl/build.gradle.kts
@@ -25,7 +25,7 @@ java {
 
 dependencies {
 	compileOnly("org.apache.ant:ant:1.10.14")
-	testImplementation("org.assertj:assertj-core:3.24.2")
+	testImplementation("org.assertj:assertj-core:3.25.3")
 	testImplementation("org.junit.jupiter:junit-jupiter:5.10.1")
 	testImplementation("org.scilab.forge:jlatexmath:1.0.7")
 	testImplementation("org.xmlunit:xmlunit-core:2.9.+")
diff --git a/plantuml-gplv2/build.gradle.kts b/plantuml-gplv2/build.gradle.kts
index e5903f8ba..31c5670e4 100644
--- a/plantuml-gplv2/build.gradle.kts
+++ b/plantuml-gplv2/build.gradle.kts
@@ -25,7 +25,7 @@ java {
 
 dependencies {
 	compileOnly("org.apache.ant:ant:1.10.14")
-	testImplementation("org.assertj:assertj-core:3.24.2")
+	testImplementation("org.assertj:assertj-core:3.25.3")
 	testImplementation("org.junit.jupiter:junit-jupiter:5.10.1")
 	testImplementation("org.scilab.forge:jlatexmath:1.0.7")
 	testImplementation("org.xmlunit:xmlunit-core:2.9.+")
diff --git a/plantuml-lgpl/build.gradle.kts b/plantuml-lgpl/build.gradle.kts
index 5f6ebfd67..79b38afc5 100644
--- a/plantuml-lgpl/build.gradle.kts
+++ b/plantuml-lgpl/build.gradle.kts
@@ -25,7 +25,7 @@ java {
 
 dependencies {
 	compileOnly("org.apache.ant:ant:1.10.14")
-	testImplementation("org.assertj:assertj-core:3.24.2")
+	testImplementation("org.assertj:assertj-core:3.25.3")
 	testImplementation("org.junit.jupiter:junit-jupiter:5.10.1")
 	testImplementation("org.scilab.forge:jlatexmath:1.0.7")
 	testImplementation("org.xmlunit:xmlunit-core:2.9.+")
diff --git a/plantuml-mit/build.gradle.kts b/plantuml-mit/build.gradle.kts
index 4d3655bfa..bf9d48878 100644
--- a/plantuml-mit/build.gradle.kts
+++ b/plantuml-mit/build.gradle.kts
@@ -25,7 +25,7 @@ java {
 
 dependencies {
 	compileOnly("org.apache.ant:ant:1.10.14")
-	testImplementation("org.assertj:assertj-core:3.24.2")
+	testImplementation("org.assertj:assertj-core:3.25.3")
 	testImplementation("org.junit.jupiter:junit-jupiter:5.10.1")
 	testImplementation("org.scilab.forge:jlatexmath:1.0.7")
 	testImplementation("org.xmlunit:xmlunit-core:2.9.+")