diff --git a/experimental/silverwood/crates/silverwood-core/src/docstore.rs b/experimental/silverwood/crates/silverwood-core/src/docstore.rs
index f170e31..131c32b 100644
--- a/experimental/silverwood/crates/silverwood-core/src/docstore.rs
+++ b/experimental/silverwood/crates/silverwood-core/src/docstore.rs
@@ -165,6 +165,7 @@ impl DocStore for FilesDocStore {
         let file = OpenOptions::new()
             .create(true)
             .write(true)
+            .truncate(false)
             .open(&path)
             .map_err(|e| Error::io(&path, e))?;
         file.lock().map_err(|e| Error::io(&path, e))?;
@@ -276,6 +277,7 @@ mod tests {
         let probe = std::fs::OpenOptions::new()
             .create(true)
             .write(true)
+            .truncate(false)
             .open(store.lock_path(id))
             .unwrap();
         assert!(
diff --git a/experimental/silverwood/flake.lock b/experimental/silverwood/flake.lock
index b7d265d..ff43d2b 100644
--- a/experimental/silverwood/flake.lock
+++ b/experimental/silverwood/flake.lock
@@ -51,11 +51,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1783816212,
-        "narHash": "sha256-2aZisVTVGSFEk3MYcOiWQp3zvwyzbqpktB69Rcfp150=",
+        "lastModified": 1791011291,
+        "narHash": "sha256-V6OBJccNKBo/ktknxlJXZChPoI0NE2lembArBO3CE9k=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "3b32825de172d0bc85664f495edb096b10862524",
+        "rev": "73e728ddb6b7a12d18808f510813a13ee1fe4cce",
         "type": "github"
       },
       "original": {