diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index d47c3962..b58755b0 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -2,7 +2,7 @@ ci:
   autoupdate_schedule: "quarterly"
 repos:
 - repo: https://github.com/astral-sh/ruff-pre-commit
-  rev: v0.5.1
+  rev: v0.6.9
   hooks:
     - id: ruff
       args: ["--fix", "--unsafe-fixes"]
diff --git a/openmmforcefields/data/minidrugbank/Filter unspecified stereochemistry.ipynb b/openmmforcefields/data/minidrugbank/Filter unspecified stereochemistry.ipynb
index 9be41b5f..2ac9d388 100644
--- a/openmmforcefields/data/minidrugbank/Filter unspecified stereochemistry.ipynb	
+++ b/openmmforcefields/data/minidrugbank/Filter unspecified stereochemistry.ipynb	
@@ -15,8 +15,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "ifs = oechem.oemolistream('MiniDrugBank.sdf')\n",
-    "ofs = oechem.oemolostream('MiniDrugBank-without-unspecifie-stereochemistry.sdf')"
+    "ifs = oechem.oemolistream(\"MiniDrugBank.sdf\")\n",
+    "ofs = oechem.oemolostream(\"MiniDrugBank-without-unspecifie-stereochemistry.sdf\")"
    ]
   },
   {
@@ -28,8 +28,6 @@
     "mol = oechem.OEGraphMol()\n",
     "\n",
     "while oechem.OEReadMolecule(ifs, mol):\n",
-    "    \n",
-    "    \n",
     "    oechem.OEWriteMolecule(ofs, mol)"
    ]
   },