diff --git a/Cargo.lock b/Cargo.lock
index 1831c70..64b7516 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -139,7 +139,7 @@ checksum = "5d85653f070353a16313d0046f173f70d1aadd5b42600a14de626f0dfb3473a5"
 dependencies = [
  "byteorder",
  "digest 0.8.1",
- "rand_core",
+ "rand_core 0.5.1",
  "subtle",
  "zeroize",
 ]
@@ -152,7 +152,7 @@ checksum = "c8492de420e9e60bc9a1d66e2dbb91825390b738a388606600663fc529b4b307"
 dependencies = [
  "byteorder",
  "digest 0.9.0",
- "rand_core",
+ "rand_core 0.5.1",
  "subtle",
  "zeroize",
 ]
@@ -293,7 +293,7 @@ checksum = "c6feca46f4fa3443a01769d768727f10c10a20fdb65e52dc16a81f0c8269bb78"
 dependencies = [
  "byteorder",
  "keccak",
- "rand_core",
+ "rand_core 0.5.1",
  "zeroize",
 ]
 
@@ -341,8 +341,8 @@ checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
 dependencies = [
  "getrandom",
  "libc",
- "rand_chacha",
- "rand_core",
+ "rand_chacha 0.2.2",
+ "rand_core 0.5.1",
  "rand_hc",
 ]
 
@@ -353,7 +353,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
 dependencies = [
  "ppv-lite86",
- "rand_core",
+ "rand_core 0.5.1",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core 0.6.3",
 ]
 
 [[package]]
@@ -365,13 +375,19 @@ dependencies = [
  "getrandom",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d34f1408f55294453790c48b2f1ebbb1c5b4b7563eb1f418bcfcfdbb06ebb4e7"
+
 [[package]]
 name = "rand_hc"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
 dependencies = [
- "rand_core",
+ "rand_core 0.5.1",
 ]
 
 [[package]]
@@ -407,7 +423,7 @@ dependencies = [
  "getrandom",
  "merlin",
  "rand",
- "rand_core",
+ "rand_core 0.5.1",
  "sha2 0.8.2",
  "subtle",
  "zeroize",
@@ -422,7 +438,7 @@ dependencies = [
  "hex-literal",
  "merlin",
  "rand",
- "rand_chacha",
+ "rand_chacha 0.3.1",
  "schnorrkel",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index d9b376b..7621df2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@ crate-type = ["cdylib", "staticlib"]
 [dependencies]
 schnorrkel = { version="0.9.1", features = ["preaudit_deprecated"] }
 ed25519-dalek = { version="1.0.0" }
-rand_chacha = "0.2.2"
+rand_chacha = "0.3.1"
 merlin = { version = "2.0", default-features = false }
 
 [dev-dependencies]