diff --git a/tools/bots/test_matrix.json b/tools/bots/test_matrix.json
index b511ce01f45..9e0995a7757 100644
--- a/tools/bots/test_matrix.json
+++ b/tools/bots/test_matrix.json
@@ -1588,7 +1588,7 @@
             "vm/dart/tsan"
           ],
           "fileset": "vm",
-          "shards": 3
+          "shards": 4
         }
       ]
     },
@@ -1781,7 +1781,7 @@
             "pkg/pkg/vm_service/"
           ],
           "fileset": "vm",
-          "shards": 6
+          "shards": 4
         }
       ]
     },
@@ -1811,7 +1811,7 @@
             "pkg/pkg/vm_service/"
           ],
           "fileset": "vm",
-          "shards": 6
+          "shards": 8
         }
       ]
     },