diff --git a/platform/backend/workspace/src/WorkspaceModel.kt b/platform/backend/workspace/src/WorkspaceModel.kt
index 8f1c05d34d91..3345eabe89e2 100644
--- a/platform/backend/workspace/src/WorkspaceModel.kt
+++ b/platform/backend/workspace/src/WorkspaceModel.kt
@@ -8,6 +8,7 @@ import com.intellij.platform.workspace.storage.ImmutableEntityStorage
 import com.intellij.platform.workspace.storage.MutableEntityStorage
 import com.intellij.platform.workspace.storage.VersionedStorageChange
 import com.intellij.platform.workspace.storage.url.VirtualFileUrlManager
+import com.intellij.util.concurrency.annotations.RequiresWriteLock
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.flow.SharedFlow
 import org.jetbrains.annotations.ApiStatus.Obsolete
@@ -52,6 +53,7 @@ public interface WorkspaceModel {
    * on synchronous data modification executed under WA. For all other proposes and for the newly written code, use [update]
    */
   @Obsolete
+  @RequiresWriteLock
   public fun updateProjectModel(description: @NonNls String, updater: (MutableEntityStorage) -> Unit)
 
   /**