diff --git a/packages/dbgpt-core/src/dbgpt/rag/text_splitter/tests/test_splitters.py b/packages/dbgpt-core/src/dbgpt/rag/text_splitter/tests/test_splitters.py
index 6b31f397f4..67481f1f7c 100644
--- a/packages/dbgpt-core/src/dbgpt/rag/text_splitter/tests/test_splitters.py
+++ b/packages/dbgpt-core/src/dbgpt/rag/text_splitter/tests/test_splitters.py
@@ -1,3 +1,5 @@
+import pytest
+
 from dbgpt.core import Chunk
 from dbgpt.rag.text_splitter.text_splitter import (
     CharacterTextSplitter,
@@ -63,3 +65,26 @@ def test_character_text_splitter_empty_doc() -> None:
     output = splitter.split_text(text)
     expected_output = ["db", "gpt"]
     assert output == expected_output
+
+
+def test_spacy_text_splitter() -> None:
+    """Smoke test SpacyTextSplitter against the installed spacy version.
+
+    Guards the spacy>=3.8 upgrade (Python 3.13 support): verifies the public
+    spacy API used by SpacyTextSplitter (spacy.load / nlp(text).sents) still
+    works. Skips when spacy or the en pipeline is unavailable so the suite
+    stays green without the optional ``rag`` extra installed.
+    """
+    pytest.importorskip("spacy", reason="spacy (rag extra) not installed")
+
+    from dbgpt.rag.text_splitter.text_splitter import SpacyTextSplitter
+
+    try:
+        splitter = SpacyTextSplitter(pipeline="en_core_web_sm", chunk_size=1000)
+    except Exception as e:  # pragma: no cover - depends on model download
+        pytest.skip(f"spacy pipeline unavailable: {e}")
+
+    text = "This is the first sentence. Here is the second one. And a third."
+    output = splitter.split_text(text)
+    assert output, "SpacyTextSplitter returned no chunks"
+    assert "first sentence" in " ".join(output)
diff --git a/packages/dbgpt-ext/pyproject.toml b/packages/dbgpt-ext/pyproject.toml
index 53948b87c6..ccfbb2324f 100644
--- a/packages/dbgpt-ext/pyproject.toml
+++ b/packages/dbgpt-ext/pyproject.toml
@@ -26,7 +26,9 @@ build-backend = "hatchling.build"
 
 [project.optional-dependencies]
 rag = [
-    "spacy==3.7",
+    # spacy 3.8+ is compiled with Cython 3 and ships wheels for Python 3.13.
+    # Pin below 4.0 to avoid picking up a future major release with API changes.
+    "spacy>=3.8,<4.0",
     "markdown",
     "bs4",
     "python-pptx",