diff --git a/Cargo.toml b/Cargo.toml
index 2fe82a3..72b52b7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,6 +21,8 @@ map-unwrap-or = "warn"
 rusqlite = { version = "=0.38.0", features = ["blob", "trace", "bundled"] }
 log = { version = "=0.4.29", features = ["std"] }
 parking_lot = "=0.12.5"
+libc = "0.2"
+tempfile = "3"
 
 [build-dependencies]
 bindgen = { version = "0.72", default-features = false }
diff --git a/src/vfs.rs b/src/vfs.rs
index 4b94ab9..802c609 100644
--- a/src/vfs.rs
+++ b/src/vfs.rs
@@ -313,7 +313,11 @@ fn register_inner<T: Vfs>(
     }
 
     let io_methods = ffi::sqlite3_io_methods {
-        iVersion: 3,
+        // iVersion 2 = SHM/WAL support (xShmMap through xShmUnmap).
+        // iVersion 3 requires xFetch/xUnfetch to be non-null, but they are
+        // currently None. Setting 3 with null xFetch causes SEGFAULT when
+        // SQLite calls xFetch during WAL checkpoint under concurrent load.
+        iVersion: 2,
         xClose: Some(x_close::<T>),
         xRead: Some(x_read::<T>),
         xWrite: Some(x_write::<T>),