diff --git a/src/Plugins/Shard.php b/src/Plugins/Shard.php
index e47920d4..ef11f632 100644
--- a/src/Plugins/Shard.php
+++ b/src/Plugins/Shard.php
@@ -55,6 +55,11 @@ final class Shard implements AddsOutput, HandlesArguments, Terminable
      */
     private static bool $shardsOutdated = false;
 
+    /**
+     * Whether the test suite passed.
+     */
+    private static bool $passed = false;
+
     /**
      * Collected timings from workers or subscribers.
      *
@@ -217,7 +222,9 @@ final class Shard implements AddsOutput, HandlesArguments, Terminable
      */
     public function addOutput(int $exitCode): int
     {
-        if (self::$updateShards && ! Parallel::isWorker()) {
+        self::$passed = $exitCode === 0;
+
+        if (self::$updateShards && self::$passed && ! Parallel::isWorker()) {
             self::$collectedTimings = $this->collectTimings();
 
             $count = self::$knownTests !== null
@@ -280,6 +287,10 @@ final class Shard implements AddsOutput, HandlesArguments, Terminable
             return;
         }
 
+        if (! self::$passed) {
+            return;
+        }
+
         $timings = self::$collectedTimings ?? $this->collectTimings();
 
         if ($timings === []) {