diff --git a/Cargo.toml b/Cargo.toml
index e5b12e8..854fe1e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,7 @@ readme = "README.md"
 
 [dependencies]
 failure = "0.1.1"
-random-access-storage = "0.6.0"
+random-access-storage = "2.0.0"
 
 [dev-dependencies]
 quickcheck = "0.8.1"
diff --git a/src/lib.rs b/src/lib.rs
index 53bba53..b28df66 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -188,4 +188,16 @@ impl RandomAccess for RandomAccessMemory {
 
     Ok(())
   }
+
+  fn truncate(&mut self, _length: usize) -> Result<(), Self::Error> {
+    unimplemented!()
+  }
+
+  fn len(&mut self) -> Result<usize, Self::Error> {
+    Ok(self.length)
+  }
+
+  fn is_empty(&mut self) -> Result<bool, Self::Error> {
+    Ok(self.length == 0)
+  }
 }
diff --git a/tests/test.rs b/tests/test.rs
index d874400..694e6ad 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -30,3 +30,21 @@ fn can_read() {
   let text = String::from_utf8(text.to_vec()).unwrap();
   assert_eq!(text, "hello world");
 }
+
+#[test]
+fn can_len() {
+  let mut file = ram::RandomAccessMemory::default();
+  assert_eq!(file.len().unwrap(), 0);
+  file.write(0, b"hello").unwrap();
+  assert_eq!(file.len().unwrap(), 5);
+  file.write(5, b" world").unwrap();
+  assert_eq!(file.len().unwrap(), 11);
+}
+
+#[test]
+fn can_is_empty() {
+  let mut file = ram::RandomAccessMemory::default();
+  assert_eq!(file.is_empty().unwrap(), true);
+  file.write(0, b"hello").unwrap();
+  assert_eq!(file.is_empty().unwrap(), false);
+}