diff --git a/cache_utils/Cargo.toml b/cache_utils/Cargo.toml
index 4f08f6d..110e4b7 100644
--- a/cache_utils/Cargo.toml
+++ b/cache_utils/Cargo.toml
@@ -10,14 +10,14 @@ edition = "2018"
 polling_serial = { path = "../polling_serial", optional = true }
 vga_buffer = { path = "../vga_buffer", optional = true }
 cpuid = { path = "../cpuid", default-features = false }
-x86_64 = "0.12.2"
+x86_64 = "0.14.1"
 static_assertions = "1.1.0"
-itertools = { version = "0.9.0", default-features = false }
-atomic = { version = "0.5.0" }
+itertools = { version = "0.10.0", default-features = false }
+atomic = "0.5.0"
 
-nix = { version = "0.18.0", optional = true }
-libc = { version = "0.2.77", optional = true }
-hashbrown = { version = "0.9.1", optional = true }
+nix = { version = "0.20.0", optional = true }
+libc = { version = "0.2.92", optional = true }
+hashbrown = { version = "0.11.2", optional = true }
 turn_lock = { path = "../turn_lock", optional = true}
 
 [features]
diff --git a/cache_utils/src/mmap.rs b/cache_utils/src/mmap.rs
index d2ed871..dcc3b5c 100644
--- a/cache_utils/src/mmap.rs
+++ b/cache_utils/src/mmap.rs
@@ -89,7 +89,7 @@ impl<T> DerefMut for MMappedMemory<T> {
 
 impl<T> AsRef<[T]> for MMappedMemory<T> {
     fn as_ref(&self) -> &[T] {
-        unimplemented!()
+        self.slice()
     }
 }