diff --git a/build.gradle b/build.gradle
index b840edd2..3da7e831 100644
--- a/build.gradle
+++ b/build.gradle
@@ -42,7 +42,7 @@ dependencies {
     testImplementation 'commons-io:commons-io:2.16.1'
     testCompileOnly 'org.jetbrains:annotations:24.1.0'
 
-    testImplementation 'org.assertj:assertj-core:3.25.3'
+    testImplementation 'org.assertj:assertj-core:3.26.3'
     testImplementation(platform('org.junit:junit-bom:5.11.0'))
     testImplementation 'org.junit.jupiter:junit-jupiter'
 
diff --git a/fast-double-parser/build.gradle b/fast-double-parser/build.gradle
index 70528a18..e3c1d3b2 100644
--- a/fast-double-parser/build.gradle
+++ b/fast-double-parser/build.gradle
@@ -10,7 +10,7 @@ dependencies {
     // Multi-release jar, 8+ compatible
     implementation 'ch.randelshofer:fastdoubleparser:1.0.0'
 
-    testImplementation 'org.assertj:assertj-core:3.25.3'
+    testImplementation 'org.assertj:assertj-core:3.26.3'
     testImplementation(platform('org.junit:junit-bom:5.11.0'))
     testImplementation 'org.junit.jupiter:junit-jupiter'
 }