diff --git a/codex-rs/core/BUILD.bazel b/codex-rs/core/BUILD.bazel
index 4df2762535..723cee347c 100644
--- a/codex-rs/core/BUILD.bazel
+++ b/codex-rs/core/BUILD.bazel
@@ -37,7 +37,7 @@ codex_rust_crate(
     ],
     test_shard_counts = {
         "core-all-test": 16,
-        "core-unit-tests": 8,
+        "core-unit-tests": 16,
     },
     test_tags = ["no-sandbox"],
     test_threads = select({