diff --git a/api/pyproject.toml b/api/pyproject.toml
index 26efc55f..411115ec 100644
--- a/api/pyproject.toml
+++ b/api/pyproject.toml
@@ -82,7 +82,7 @@ dependencies = [
     "pytest>=9.0.1",
     "matplotlib>=3.10.7",
     "langfuse>=3.10.0",
-    "beartype==0.22.5",
+    "beartype>=0.18.5,<0.19.0",
     "pdfplumber==0.11.7",
     "olefile==0.47",
     "cachetools==6.2.1",
diff --git a/api/requirements.txt b/api/requirements.txt
index 25f1adcb..f40c2e4d 100644
--- a/api/requirements.txt
+++ b/api/requirements.txt
@@ -76,7 +76,7 @@ pytest>=9.0.1
 pytest-asyncio>=0.24.0
 matplotlib>=3.10.7
 langfuse>=3.10.0
-beartype==0.22.5
+beartype>=0.18.5,<0.19.0
 pdfplumber==0.11.7
 olefile==0.47
 cachetools==6.2.1