diff --git a/src/cocoindex_code/indexer.py b/src/cocoindex_code/indexer.py
index 18f0dd7..4596011 100644
--- a/src/cocoindex_code/indexer.py
+++ b/src/cocoindex_code/indexer.py
@@ -11,7 +11,7 @@
 from cocoindex.resources.id import IdGenerator
 
 from .settings import PROJECT_SETTINGS
-from .shared import CODEBASE_DIR, EMBEDDER, SQLITE_DB, CodeChunk
+from .shared import CODEBASE_DIR, EMBEDDER, EXT_LANG_OVERRIDE_MAP, SQLITE_DB, CodeChunk
 
 # Chunking configuration
 CHUNK_SIZE = 2000
@@ -28,7 +28,6 @@ async def process_file(
     table: sqlite.TableTarget[CodeChunk],
 ) -> None:
     """Process a single file: chunk, embed, and store."""
-    ps = coco.use_context(PROJECT_SETTINGS)
     embedder = coco.use_context(EMBEDDER)
 
     try:
@@ -40,10 +39,9 @@ async def process_file(
         return
 
     suffix = file.file_path.path.suffix
-    # Check language overrides from project settings
-    override_map = {f".{lo.ext}": lo.lang for lo in ps.language_overrides}
+    ext_lang_override_map = coco.use_context(EXT_LANG_OVERRIDE_MAP)
     language = (
-        override_map.get(suffix)
+        ext_lang_override_map.get(suffix)
         or detect_code_language(filename=file.file_path.path.name)
         or "text"
     )
diff --git a/src/cocoindex_code/project.py b/src/cocoindex_code/project.py
index 7876f7d..3e9cf7f 100644
--- a/src/cocoindex_code/project.py
+++ b/src/cocoindex_code/project.py
@@ -12,7 +12,7 @@
 from .indexer import indexer_main
 from .protocol import IndexingProgress
 from .settings import PROJECT_SETTINGS, ProjectSettings
-from .shared import CODEBASE_DIR, EMBEDDER, SQLITE_DB, Embedder
+from .shared import CODEBASE_DIR, EMBEDDER, EXT_LANG_OVERRIDE_MAP, SQLITE_DB, Embedder
 
 
 class Project:
@@ -86,6 +86,10 @@ async def create(
         context.provide(SQLITE_DB, sqlite.connect(str(target_sqlite_db_path), load_vec=True))
         context.provide(EMBEDDER, embedder)
         context.provide(PROJECT_SETTINGS, project_settings)
+        context.provide(
+            EXT_LANG_OVERRIDE_MAP,
+            {f".{lo.ext}": lo.lang for lo in project_settings.language_overrides},
+        )
 
         env = coco.Environment(settings, context_provider=context)
         app = coco.App(
diff --git a/src/cocoindex_code/shared.py b/src/cocoindex_code/shared.py
index 714224d..7882ddb 100644
--- a/src/cocoindex_code/shared.py
+++ b/src/cocoindex_code/shared.py
@@ -31,6 +31,7 @@
 EMBEDDER = coco.ContextKey[Embedder]("embedder")
 SQLITE_DB = coco.ContextKey[sqlite.ManagedConnection]("index_db", tracked=False)
 CODEBASE_DIR = coco.ContextKey[pathlib.Path]("codebase", tracked=False)
+EXT_LANG_OVERRIDE_MAP = coco.ContextKey[dict[str, str]]("ext_lang_override_map")
 
 # Module-level variable — set by daemon at startup (needed for CodeChunk annotation).
 embedder: Embedder | None = None