diff --git a/lib/runtime-core/build.rs b/lib/runtime-core/build.rs
index 9fd1ea457..6187b4fd1 100644
--- a/lib/runtime-core/build.rs
+++ b/lib/runtime-core/build.rs
@@ -1,4 +1,3 @@
-use blake3;
 use std::{env, fs, io::Write, path::PathBuf};
 
 const WASMER_VERSION: &'static str = env!("CARGO_PKG_VERSION");
diff --git a/lib/runtime-core/src/cache.rs b/lib/runtime-core/src/cache.rs
index c3a5f50a4..f95bba614 100644
--- a/lib/runtime-core/src/cache.rs
+++ b/lib/runtime-core/src/cache.rs
@@ -3,7 +3,6 @@
 //! and loaded to allow skipping compilation and fast startup.
 
 use crate::{module::ModuleInfo, sys::Memory};
-use blake3;
 use std::{io, mem, slice};
 
 /// Indicates the invalid type of invalid cache file