diff --git a/Cargo.lock b/Cargo.lock
index da39d90..69bfec4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,106 +1,87 @@
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diff --git a/Cargo.toml b/Cargo.toml
index 70bd4c0..17891cf 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@ edition = "2018"
 features = ["cached-block-device"]
 
 [dependencies]
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+lru = { version = "0.8.1", optional = true }
 plain = { version = "0.2.3" }
 
 [features]