diff --git a/fs_mgr/libsnapshot/include/libsnapshot/cow_format.h b/fs_mgr/libsnapshot/include/libsnapshot/cow_format.h
index 1a7ec6195..717ad2dcb 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/cow_format.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/cow_format.h
@@ -34,7 +34,7 @@ static constexpr uint32_t kCowVersionMinor = 0;
 static constexpr uint32_t kCowVersionManifest = 2;
 
 static constexpr uint32_t kMinCowVersion = 1;
-static constexpr uint32_t kMaxCowVersion = 2;
+static constexpr uint32_t kMaxCowVersion = 3;
 
 // Normally, this should be kMaxCowVersion. When a new version is under testing
 // it may be the previous value of kMaxCowVersion.
diff --git a/fs_mgr/libsnapshot/snapshot.cpp b/fs_mgr/libsnapshot/snapshot.cpp
index e91e3b73c..79cebab78 100644
--- a/fs_mgr/libsnapshot/snapshot.cpp
+++ b/fs_mgr/libsnapshot/snapshot.cpp
@@ -3642,6 +3642,9 @@ std::unique_ptr<ICowWriter> SnapshotManager::OpenCompressedSnapshotWriter(
     cow_options.max_blocks = {status.device_size() / cow_options.block_size};
     cow_options.batch_write = status.batched_writes();
     cow_options.num_compress_threads = status.enable_threading() ? 2 : 0;
+    // TODO(b/313962438) Improve op_count estimate. For now, use number of
+    // blocks as an upper bound.
+    cow_options.op_count_max = status.device_size() / cow_options.block_size;
     // Disable scratch space for vts tests
     if (device()->IsTestDevice()) {
         cow_options.scratch_space = false;