diff --git a/pyproject.toml b/pyproject.toml
index 5d65422d3..c61775f4a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -89,6 +89,8 @@ mem-user = [
 
 # MemReader
 mem-reader = [
+    # chonkie>=1.6 pulls numpy>=2.0; any environment that also has scipy
+    # installed must use scipy>=1.13 (older scipy pins numpy<1.27). See #1342.
     "chonkie (>=1.0.7,<2.0.0)",  # Sentence chunking library
     "markitdown[docx,pdf,pptx,xls,xlsx] (>=0.1.1,<0.2.0)",  # Markdown parser for various file formats
     "langchain-text-splitters (>=1.0.0,<2.0.0)", # markdown chunk for langchain
@@ -193,7 +195,9 @@ zep-cloud = "^2.15.0"
 rouge-score = "^0.1.2"
 nltk = "^3.9.1"
 bert-score = "^0.3.13"
-scipy = "^1.10.1"
+# scipy 1.13+ supports numpy 2.x. Older scipy (1.10/1.11/1.12) pins numpy<1.27
+# which collides with chonkie>=1.6 (requires numpy>=2.0.0) — see issue #1342.
+scipy = "^1.13.0"
 python-dotenv = "^1.1.1"
 langgraph = "^0.5.1"