diff --git a/buildSrc/src/main/java/Dependencies.kt b/buildSrc/src/main/java/Dependencies.kt
index 60ec16af8..65bc76e67 100644
--- a/buildSrc/src/main/java/Dependencies.kt
+++ b/buildSrc/src/main/java/Dependencies.kt
@@ -39,7 +39,6 @@ object Versions {
     const val installreferrer = "1.0"
 
     const val junit = "5.5.2"
-    const val assertJ = "3.13.2"
     const val mockito = "2.24.5"
     const val mockk = "1.9.kotlin12"
     const val assertk = "0.19"
@@ -207,6 +206,5 @@ object Deps {
     const val detektTest = "io.gitlab.arturbosch.detekt:detekt-test:${Versions.detekt}"
     const val junitApi = "org.junit.jupiter:junit-jupiter-api:${Versions.junit}"
     const val junitParams = "org.junit.jupiter:junit-jupiter-params:${Versions.junit}"
-    const val assertJ = "org.assertj:assertj-core:${Versions.assertJ}"
     const val junitEngine = "org.junit.jupiter:junit-jupiter-engine:${Versions.junit}"
 }
diff --git a/mozilla-detekt-rules/build.gradle b/mozilla-detekt-rules/build.gradle
index 7ddd37cce..9b7bdf731 100644
--- a/mozilla-detekt-rules/build.gradle
+++ b/mozilla-detekt-rules/build.gradle
@@ -8,7 +8,6 @@ dependencies {
   implementation Deps.kotlin_stdlib
   testImplementation Deps.junitApi
   testImplementation Deps.junitParams
-  testImplementation Deps.assertJ
   testRuntimeOnly Deps.junitEngine
 }
 
diff --git a/mozilla-detekt-rules/src/test/java/org/mozilla/fenix/detektrules/MozillaBannedPropertyAccessTest.kt b/mozilla-detekt-rules/src/test/java/org/mozilla/fenix/detektrules/MozillaBannedPropertyAccessTest.kt
index 0c12eaf1e..e9b6b7271 100644
--- a/mozilla-detekt-rules/src/test/java/org/mozilla/fenix/detektrules/MozillaBannedPropertyAccessTest.kt
+++ b/mozilla-detekt-rules/src/test/java/org/mozilla/fenix/detektrules/MozillaBannedPropertyAccessTest.kt
@@ -6,7 +6,8 @@ package org.mozilla.fenix.detektrules
 
 import io.gitlab.arturbosch.detekt.test.lint
 import io.gitlab.arturbosch.detekt.api.YamlConfig
-import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertTrue
 import org.junit.jupiter.api.DisplayName
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.params.ParameterizedTest
@@ -22,8 +23,8 @@ internal class MozillaBannedPropertyAccessTest {
             MozillaBannedPropertyAccess(YamlConfig.loadResource(this.javaClass.getResource("/config.yml"))).lint(
                 NONCOMPLIANT_ACCESS.trimIndent()
             )
-        assertThat(findings).hasSize(1)
-        assertThat(findings[0].issue.description).isEqualTo(DESCR)
+        assertEquals(1, findings.size)
+        assertEquals(DESCR, findings[0].issue.description)
     }
 
     @DisplayName("compliant ")
@@ -34,7 +35,7 @@ internal class MozillaBannedPropertyAccessTest {
             MozillaBannedPropertyAccess(YamlConfig.loadResource(this.javaClass.getResource("/config.yml"))).lint(
                 source
             )
-        assertThat(findings).isEmpty()
+        assertTrue(findings.isEmpty())
     }
 
     companion object {
@@ -78,4 +79,4 @@ const val COMPLIANT_ACCESS = """
                 }
             }
         }
-        """
\ No newline at end of file
+        """