diff --git a/Cargo.lock b/Cargo.lock
index 2ac272e7c..03ea96029 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -67,9 +67,7 @@ dependencies = [
 name = "bigint"
 version = "0.1.0"
 dependencies = [
- "arrayvec 0.3.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.7.9 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/util/bigint/Cargo.toml b/util/bigint/Cargo.toml
index 1bd2b994e..fe9101df7 100644
--- a/util/bigint/Cargo.toml
+++ b/util/bigint/Cargo.toml
@@ -12,8 +12,6 @@ rustc_version = "0.1"
 
 [dependencies]
 rustc-serialize = "0.3"
-arrayvec = "0.3"
-rand = "0.3.12"
 serde = "0.7.0"
 heapsize = "0.3"