diff --git a/elasticsearch/helpers/vectorstore/_utils.py b/elasticsearch/helpers/vectorstore/_utils.py
index df91b5cc9..d8f7b339f 100644
--- a/elasticsearch/helpers/vectorstore/_utils.py
+++ b/elasticsearch/helpers/vectorstore/_utils.py
@@ -100,7 +100,8 @@ def _cosine_similarity(X: Matrix, Y: Matrix) -> "npt.NDArray[np.float64]":
 
     X = np.array(X, dtype=np.float32)
     Y = np.array(Y, dtype=np.float32)
-    Z = 1 - np.array(simd.cdist(X, Y, metric="cosine"))
+    # https://github.com/ashvardanian/SimSIMD/issues/171
+    Z = 1 - np.array(simd.cdist(X, Y, metric="cosine"))  # type: ignore[arg-type]
     if isinstance(Z, float):
         return np.array([Z])
     return np.array(Z)
diff --git a/pyproject.toml b/pyproject.toml
index ba83d6329..1a2563680 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -76,7 +76,7 @@ dev = [
 ]
 docs = [
     "sphinx",
-    "sphinx-rtd-theme",
+    "sphinx-rtd-theme>=2.0",
     "sphinx-autodoc-typehints"
 ]