diff --git a/build.gradle b/build.gradle
index 40932a8111..c1bf9405c1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -35,7 +35,7 @@ ext.deps = [
   'picocli'       : 'info.picocli:picocli:3.9.6',
   // Testing libraries
   'junit'         : 'junit:junit:4.12',
-  'assertj'       : 'org.assertj:assertj-core:3.9.0',
+  'assertj'       : 'org.assertj:assertj-core:3.12.2',
   'jimfs'         : 'com.google.jimfs:jimfs:1.1'
 ]
 
@@ -67,7 +67,7 @@ allprojects {
   tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile) {
     sourceCompatibility = JavaVersion.VERSION_1_8
     targetCompatibility = JavaVersion.VERSION_1_8
-    
+
     kotlinOptions {
       jvmTarget = '1.8'
     }
diff --git a/pom.xml b/pom.xml
index 8a44113e77..372a5bdbc0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -57,7 +57,7 @@
         <aether.maven.provider.version>3.3.9</aether.maven.provider.version>
         <picocli.version>3.9.6</picocli.version>
         <junit.version>4.12</junit.version>
-        <assertj.version>3.9.0</assertj.version>
+        <assertj.version>3.12.2</assertj.version>
         <jimfs.version>1.1</jimfs.version>
         <gpg.skip>false</gpg.skip>
         <github.description>${project.version}</github.description>