diff --git a/lesson_09/types/types_app/build.gradle.kts b/lesson_09/types/types_app/build.gradle.kts
index de635e73c..928d48b04 100644
--- a/lesson_09/types/types_app/build.gradle.kts
+++ b/lesson_09/types/types_app/build.gradle.kts
@@ -17,14 +17,14 @@ repositories {
 dependencies {
     // Use JUnit Jupiter for testing.
     testImplementation("com.codedifferently.instructional:instructional-lib")
-    testImplementation("org.junit.jupiter:junit-jupiter:5.9.1")
+    testImplementation("org.junit.jupiter:junit-jupiter:5.11.3")
     testImplementation("org.springframework.boot:spring-boot-starter-test")
-    testImplementation("org.assertj:assertj-core:3.25.1")
+    testImplementation("org.assertj:assertj-core:3.26.3")
     testImplementation("at.favre.lib:bcrypt:0.10.2")
 
     // This dependency is used by the application.
     implementation("com.codedifferently.instructional:instructional-lib")
-    implementation("com.google.guava:guava:31.1-jre")
+    implementation("com.google.guava:guava:33.3.1-jre")
     implementation("com.google.code.gson:gson:2.11.0")
     implementation("org.projectlombok:lombok:1.18.30")
     implementation("org.springframework.boot:spring-boot-starter")
diff --git a/lesson_11/arrays_java/arrays_app/build.gradle.kts b/lesson_11/arrays_java/arrays_app/build.gradle.kts
index 228ff6dd4..ecf436450 100644
--- a/lesson_11/arrays_java/arrays_app/build.gradle.kts
+++ b/lesson_11/arrays_java/arrays_app/build.gradle.kts
@@ -17,14 +17,14 @@ repositories {
 dependencies {
     // Use JUnit Jupiter for testing.
     testImplementation("com.codedifferently.instructional:instructional-lib")
-    testImplementation("org.junit.jupiter:junit-jupiter:5.9.1")
+    testImplementation("org.junit.jupiter:junit-jupiter:5.11.3")
     testImplementation("org.springframework.boot:spring-boot-starter-test")
-    testImplementation("org.assertj:assertj-core:3.25.1")
+    testImplementation("org.assertj:assertj-core:3.26.3")
     testImplementation("at.favre.lib:bcrypt:0.10.2")
 
     // This dependency is used by the application.
     implementation("com.codedifferently.instructional:instructional-lib")
-    implementation("com.google.guava:guava:31.1-jre")
+    implementation("com.google.guava:guava:33.3.1-jre")
     implementation("com.google.code.gson:gson:2.11.0")
     implementation("org.projectlombok:lombok:1.18.30")
     implementation("org.springframework.boot:spring-boot-starter")
diff --git a/lesson_12/structs_java/structs_app/build.gradle.kts b/lesson_12/structs_java/structs_app/build.gradle.kts
index 9a6da5368..24b88c48a 100644
--- a/lesson_12/structs_java/structs_app/build.gradle.kts
+++ b/lesson_12/structs_java/structs_app/build.gradle.kts
@@ -17,14 +17,14 @@ repositories {
 dependencies {
     // Use JUnit Jupiter for testing.
     testImplementation("com.codedifferently.instructional:instructional-lib")
-    testImplementation("org.junit.jupiter:junit-jupiter:5.9.1")
+    testImplementation("org.junit.jupiter:junit-jupiter:5.11.3")
     testImplementation("org.springframework.boot:spring-boot-starter-test")
-    testImplementation("org.assertj:assertj-core:3.25.1")
+    testImplementation("org.assertj:assertj-core:3.26.3")
     testImplementation("at.favre.lib:bcrypt:0.10.2")
 
     // This dependency is used by the application.
     implementation("com.codedifferently.instructional:instructional-lib")
-    implementation("com.google.guava:guava:31.1-jre")
+    implementation("com.google.guava:guava:33.3.1-jre")
     implementation("com.google.code.gson:gson:2.11.0")
     implementation("org.projectlombok:lombok:1.18.30")
     implementation("org.springframework.boot:spring-boot-starter")
diff --git a/lesson_13/maps_java/maps_app/build.gradle.kts b/lesson_13/maps_java/maps_app/build.gradle.kts
index e62f04f86..cf04bf714 100644
--- a/lesson_13/maps_java/maps_app/build.gradle.kts
+++ b/lesson_13/maps_java/maps_app/build.gradle.kts
@@ -17,14 +17,14 @@ repositories {
 dependencies {
     // Use JUnit Jupiter for testing.
     testImplementation("com.codedifferently.instructional:instructional-lib")
-    testImplementation("org.junit.jupiter:junit-jupiter:5.9.1")
+    testImplementation("org.junit.jupiter:junit-jupiter:5.11.3")
     testImplementation("org.springframework.boot:spring-boot-starter-test")
-    testImplementation("org.assertj:assertj-core:3.25.1")
+    testImplementation("org.assertj:assertj-core:3.26.3")
     testImplementation("at.favre.lib:bcrypt:0.10.2")
 
     // This dependency is used by the application.
     implementation("com.codedifferently.instructional:instructional-lib")
-    implementation("com.google.guava:guava:31.1-jre")
+    implementation("com.google.guava:guava:33.3.1-jre")
     implementation("com.google.code.gson:gson:2.11.0")
     implementation("org.projectlombok:lombok:1.18.30")
     implementation("org.springframework.boot:spring-boot-starter")
diff --git a/lesson_14/exceptions/exceptions_app/build.gradle.kts b/lesson_14/exceptions/exceptions_app/build.gradle.kts
index 14757f6a5..3bf3aeedd 100644
--- a/lesson_14/exceptions/exceptions_app/build.gradle.kts
+++ b/lesson_14/exceptions/exceptions_app/build.gradle.kts
@@ -17,14 +17,14 @@ repositories {
 dependencies {
     // Use JUnit Jupiter for testing.
     testImplementation("com.codedifferently.instructional:instructional-lib")
-    testImplementation("org.junit.jupiter:junit-jupiter:5.9.1")
+    testImplementation("org.junit.jupiter:junit-jupiter:5.11.3")
     testImplementation("org.springframework.boot:spring-boot-starter-test")
-    testImplementation("org.assertj:assertj-core:3.25.1")
+    testImplementation("org.assertj:assertj-core:3.26.3")
     testImplementation("at.favre.lib:bcrypt:0.10.2")
 
     // This dependency is used by the application.
     implementation("com.codedifferently.instructional:instructional-lib")
-    implementation("com.google.guava:guava:31.1-jre")
+    implementation("com.google.guava:guava:33.3.1-jre")
     implementation("com.google.code.gson:gson:2.11.0")
     implementation("org.projectlombok:lombok:1.18.30")
     implementation("org.springframework.boot:spring-boot-starter")
diff --git a/lesson_15/tdd/tdd_app/build.gradle.kts b/lesson_15/tdd/tdd_app/build.gradle.kts
index 09234622b..8c91bb6b5 100644
--- a/lesson_15/tdd/tdd_app/build.gradle.kts
+++ b/lesson_15/tdd/tdd_app/build.gradle.kts
@@ -18,14 +18,14 @@ repositories {
 dependencies {
     // Use JUnit Jupiter for testing.
     testImplementation("com.codedifferently.instructional:instructional-lib")
-    testImplementation("org.junit.jupiter:junit-jupiter:5.9.1")
+    testImplementation("org.junit.jupiter:junit-jupiter:5.11.3")
     testImplementation("org.springframework.boot:spring-boot-starter-test")
-    testImplementation("org.assertj:assertj-core:3.25.1")
+    testImplementation("org.assertj:assertj-core:3.26.3")
     testImplementation("at.favre.lib:bcrypt:0.10.2")
 
     // This dependency is used by the application.
     implementation("com.codedifferently.instructional:instructional-lib")
-    implementation("com.google.guava:guava:31.1-jre")
+    implementation("com.google.guava:guava:33.3.1-jre")
     implementation("com.google.code.gson:gson:2.11.0")
     implementation("org.projectlombok:lombok:1.18.30")
     implementation("org.springframework.boot:spring-boot-starter")
diff --git a/lesson_16/objects/objects_app/build.gradle.kts b/lesson_16/objects/objects_app/build.gradle.kts
index 184047609..460529b07 100644
--- a/lesson_16/objects/objects_app/build.gradle.kts
+++ b/lesson_16/objects/objects_app/build.gradle.kts
@@ -18,13 +18,13 @@ repositories {
 
 dependencies {
     // Use JUnit Jupiter for testing.
-    testImplementation("org.junit.jupiter:junit-jupiter:5.9.1")
+    testImplementation("org.junit.jupiter:junit-jupiter:5.11.3")
     testImplementation("org.springframework.boot:spring-boot-starter-test")
-    testImplementation("org.assertj:assertj-core:3.25.1")
+    testImplementation("org.assertj:assertj-core:3.26.3")
     testImplementation("at.favre.lib:bcrypt:0.10.2")
 
     // This dependency is used by the application.
-    implementation("com.google.guava:guava:31.1-jre")
+    implementation("com.google.guava:guava:33.3.1-jre")
     implementation("com.google.code.gson:gson:2.11.0")
     implementation("org.springframework.boot:spring-boot-starter")
 }
diff --git a/lesson_17/bank/bank_app/build.gradle.kts b/lesson_17/bank/bank_app/build.gradle.kts
index ad11f55a0..5f768d848 100644
--- a/lesson_17/bank/bank_app/build.gradle.kts
+++ b/lesson_17/bank/bank_app/build.gradle.kts
@@ -18,13 +18,13 @@ repositories {
 
 dependencies {
     // Use JUnit Jupiter for testing.
-    testImplementation("org.junit.jupiter:junit-jupiter:5.9.1")
+    testImplementation("org.junit.jupiter:junit-jupiter:5.11.3")
     testImplementation("org.springframework.boot:spring-boot-starter-test")
-    testImplementation("org.assertj:assertj-core:3.25.1")
+    testImplementation("org.assertj:assertj-core:3.26.3")
     testImplementation("at.favre.lib:bcrypt:0.10.2")
 
     // This dependency is used by the application.
-    implementation("com.google.guava:guava:31.1-jre")
+    implementation("com.google.guava:guava:33.3.1-jre")
     implementation("com.google.code.gson:gson:2.11.0")
     implementation("org.projectlombok:lombok:1.18.30")
     implementation("org.springframework.boot:spring-boot-starter")
diff --git a/lesson_26/api/java/api_app/build.gradle.kts b/lesson_26/api/java/api_app/build.gradle.kts
index 9332d8fba..ac0c0e680 100644
--- a/lesson_26/api/java/api_app/build.gradle.kts
+++ b/lesson_26/api/java/api_app/build.gradle.kts
@@ -18,15 +18,15 @@ repositories {
 dependencies {
     // Use JUnit Jupiter for testing.
     testImplementation("com.codedifferently.instructional:instructional-lib")
-    testImplementation("org.junit.jupiter:junit-jupiter:5.9.1")
+    testImplementation("org.junit.jupiter:junit-jupiter:5.11.3")
     testImplementation("org.springframework.boot:spring-boot-starter-test")
-    testImplementation("org.assertj:assertj-core:3.25.1")
+    testImplementation("org.assertj:assertj-core:3.26.3")
     testImplementation("at.favre.lib:bcrypt:0.10.2")
     testImplementation("org.springframework.boot:spring-boot-starter-test")
 
     // This dependency is used by the application.
     implementation("com.codedifferently.instructional:instructional-lib")
-    implementation("com.google.guava:guava:31.1-jre")
+    implementation("com.google.guava:guava:33.3.1-jre")
     implementation("com.google.code.gson:gson:2.11.0")
     implementation("commons-cli:commons-cli:1.6.0")
     implementation("org.springdoc:springdoc-openapi-starter-webmvc-ui:2.6.0")
diff --git a/lesson_28/db/db_app/build.gradle.kts b/lesson_28/db/db_app/build.gradle.kts
index 0ba608d36..a2b93a1bd 100644
--- a/lesson_28/db/db_app/build.gradle.kts
+++ b/lesson_28/db/db_app/build.gradle.kts
@@ -18,14 +18,14 @@ repositories {
 dependencies {
     // Use JUnit Jupiter for testing.
     testImplementation("com.codedifferently.instructional:instructional-lib")
-    testImplementation("org.junit.jupiter:junit-jupiter:5.9.1")
+    testImplementation("org.junit.jupiter:junit-jupiter:5.11.3")
     testImplementation("org.springframework.boot:spring-boot-starter-test")
-    testImplementation("org.assertj:assertj-core:3.25.1")
+    testImplementation("org.assertj:assertj-core:3.26.3")
     testImplementation("at.favre.lib:bcrypt:0.10.2")
 
     // This dependency is used by the application.
     implementation("com.codedifferently.instructional:instructional-lib")
-    implementation("com.google.guava:guava:31.1-jre")
+    implementation("com.google.guava:guava:33.3.1-jre")
     implementation("com.google.code.gson:gson:2.11.0")
     implementation("commons-cli:commons-cli:1.6.0")
     implementation("org.springframework.boot:spring-boot-starter")
diff --git a/lib/java/codedifferently-instructional/instructional-lib/build.gradle.kts b/lib/java/codedifferently-instructional/instructional-lib/build.gradle.kts
index 98ec2ffa7..2901c61d8 100644
--- a/lib/java/codedifferently-instructional/instructional-lib/build.gradle.kts
+++ b/lib/java/codedifferently-instructional/instructional-lib/build.gradle.kts
@@ -22,15 +22,15 @@ repositories {
 
 dependencies {
     // Use JUnit Jupiter for testing.
-    testImplementation("org.junit.jupiter:junit-jupiter:5.9.1")
+    testImplementation("org.junit.jupiter:junit-jupiter:5.11.3")
     testImplementation("org.springframework.boot:spring-boot-starter-test:3.2.2")
-    testImplementation("org.assertj:assertj-core:3.25.1")
+    testImplementation("org.assertj:assertj-core:3.26.3")
 
     // This dependency is used by the application.
     implementation("com.fasterxml.jackson.core:jackson-databind:2.13.0")
     implementation("com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:2.13.0")
     implementation("com.google.code.gson:gson:2.11.0")
-    implementation("com.google.guava:guava:31.1-jre")
+    implementation("com.google.guava:guava:33.3.1-jre")
     implementation("commons-cli:commons-cli:1.6.0")
     implementation("org.projectlombok:lombok:1.18.30")
     implementation("org.springframework.boot:spring-boot-starter:3.2.2")