diff --git a/tests/jobs/statistics/CompileCounterSubmissionDailyMetricsTest.php b/tests/jobs/statistics/CompileCounterSubmissionDailyMetricsTest.php
index d5e959d362..ad6baec2fb 100644
--- a/tests/jobs/statistics/CompileCounterSubmissionDailyMetricsTest.php
+++ b/tests/jobs/statistics/CompileCounterSubmissionDailyMetricsTest.php
@@ -45,7 +45,7 @@ public function testUnserializationGetProperDepositIssueJobInstance(): void
     /**
      * Ensure that a serialized job can be unserialized and executed
      */
-    public function testRunSerializedJob()
+    public function testRunSerializedJob(): void
     {
         /** @var CompileCounterSubmissionDailyMetrics $compileCounterSubmissionDailyMetricsJob */
         $compileCounterSubmissionDailyMetricsJob = unserialize($this->serializedJobData);
diff --git a/tests/jobs/statistics/CompileCounterSubmissionInstitutionDailyMetricsTest.php b/tests/jobs/statistics/CompileCounterSubmissionInstitutionDailyMetricsTest.php
index f1f427b4fb..c8ef10c4bb 100644
--- a/tests/jobs/statistics/CompileCounterSubmissionInstitutionDailyMetricsTest.php
+++ b/tests/jobs/statistics/CompileCounterSubmissionInstitutionDailyMetricsTest.php
@@ -45,7 +45,7 @@ public function testUnserializationGetProperDepositIssueJobInstance(): void
     /**
      * Ensure that a serialized job can be unserialized and executed
      */
-    public function testRunSerializedJob()
+    public function testRunSerializedJob(): void
     {
         /** @var CompileCounterSubmissionInstitutionDailyMetrics $compileCounterSubmissionInstitutionDailyMetricsJob */
         $compileCounterSubmissionInstitutionDailyMetricsJob = unserialize($this->serializedJobData);
diff --git a/tests/jobs/statistics/CompileSubmissionGeoDailyMetricsTest.php b/tests/jobs/statistics/CompileSubmissionGeoDailyMetricsTest.php
index f5eb01bf66..16dc6f7674 100644
--- a/tests/jobs/statistics/CompileSubmissionGeoDailyMetricsTest.php
+++ b/tests/jobs/statistics/CompileSubmissionGeoDailyMetricsTest.php
@@ -45,7 +45,7 @@ public function testUnserializationGetProperDepositIssueJobInstance(): void
     /**
      * Ensure that a serialized job can be unserialized and executed
      */
-    public function testRunSerializedJob()
+    public function testRunSerializedJob(): void
     {
         /** @var CompileSubmissionGeoDailyMetrics $compileSubmissionGeoDailyMetricsJob */
         $compileSubmissionGeoDailyMetricsJob = unserialize($this->serializedJobData);
diff --git a/tests/jobs/statistics/CompileUniqueInvestigationsTest.php b/tests/jobs/statistics/CompileUniqueInvestigationsTest.php
index e8e240a90d..a5ee31b90a 100644
--- a/tests/jobs/statistics/CompileUniqueInvestigationsTest.php
+++ b/tests/jobs/statistics/CompileUniqueInvestigationsTest.php
@@ -45,7 +45,7 @@ public function testUnserializationGetProperDepositIssueJobInstance(): void
     /**
      * Ensure that a serialized job can be unserialized and executed
      */
-    public function testRunSerializedJob()
+    public function testRunSerializedJob(): void
     {
         /** @var CompileUniqueInvestigations $compileUniqueInvestigationsJob */
         $compileUniqueInvestigationsJob = unserialize($this->serializedJobData);
diff --git a/tests/jobs/statistics/CompileUniqueRequestsTest.php b/tests/jobs/statistics/CompileUniqueRequestsTest.php
index 09231862f1..c24717ae0f 100644
--- a/tests/jobs/statistics/CompileUniqueRequestsTest.php
+++ b/tests/jobs/statistics/CompileUniqueRequestsTest.php
@@ -45,7 +45,7 @@ public function testUnserializationGetProperDepositIssueJobInstance(): void
     /**
      * Ensure that a serialized job can be unserialized and executed
      */
-    public function testRunSerializedJob()
+    public function testRunSerializedJob(): void
     {
         /** @var CompileUniqueRequests $compileUniqueRequestsJob */
         $compileUniqueRequestsJob = unserialize($this->serializedJobData);
diff --git a/tests/jobs/statistics/DeleteUsageStatsTemporaryRecordsTest.php b/tests/jobs/statistics/DeleteUsageStatsTemporaryRecordsTest.php
index 801796370c..90e8201bed 100644
--- a/tests/jobs/statistics/DeleteUsageStatsTemporaryRecordsTest.php
+++ b/tests/jobs/statistics/DeleteUsageStatsTemporaryRecordsTest.php
@@ -45,7 +45,7 @@ public function testUnserializationGetProperDepositIssueJobInstance(): void
     /**
      * Ensure that a serialized job can be unserialized and executed
      */
-    public function testRunSerializedJob()
+    public function testRunSerializedJob(): void
     {
         /** @var DeleteUsageStatsTemporaryRecords $deleteUsageStatsTemporaryRecordsJob */
         $deleteUsageStatsTemporaryRecordsJob = unserialize($this->serializedJobData);
diff --git a/tests/jobs/statistics/ProcessUsageStatsLogFileTest.php b/tests/jobs/statistics/ProcessUsageStatsLogFileTest.php
index b95e1a7465..67072daf56 100644
--- a/tests/jobs/statistics/ProcessUsageStatsLogFileTest.php
+++ b/tests/jobs/statistics/ProcessUsageStatsLogFileTest.php
@@ -53,7 +53,7 @@ public function testUnserializationGetProperDepositIssueJobInstance(): void
     /**
      * Ensure that a serialized job can be unserialized and executed
      */
-    public function testRunSerializedJob()
+    public function testRunSerializedJob(): void
     {
         /** @var ProcessUsageStatsLogFile $processUsageStatsLogFileJob */
         $processUsageStatsLogFileJob = unserialize($this->serializedJobData);