diff --git a/Cargo.lock b/Cargo.lock
index 6b1046ce1e8d..977adda642a6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1379,7 +1379,7 @@ dependencies = [
  "proptest",
  "proptest-derive",
  "rand 0.7.3",
- "rand_core 0.5.1",
+ "rand_core 0.6.4",
  "ripemd160",
  "serde",
  "serde-name",
@@ -4422,7 +4422,7 @@ dependencies = [
  "proptest",
  "proptest-derive",
  "rand 0.7.3",
- "rand_core 0.5.1",
+ "rand_core 0.6.4",
  "serde",
  "serde_bytes",
  "serial_test",
@@ -5292,6 +5292,12 @@ dependencies = [
  "getrandom 0.1.15",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+
 [[package]]
 name = "rand_hc"
 version = "0.1.0"
@@ -5825,7 +5831,7 @@ dependencies = [
  "once_cell",
  "proptest",
  "rand 0.7.3",
- "rand_core 0.5.1",
+ "rand_core 0.6.4",
  "serde",
  "tempfile",
  "thiserror",
diff --git a/consensus/safety-rules/Cargo.toml b/consensus/safety-rules/Cargo.toml
index ed196e04eb99..a6c105dcebfe 100644
--- a/consensus/safety-rules/Cargo.toml
+++ b/consensus/safety-rules/Cargo.toml
@@ -10,7 +10,7 @@ edition = "2018"
 once_cell = "1.4.1"
 rand = { version = "0.7.3", default-features = false }
 proptest = { version = "0.10.1", optional = true }
-rand_core = "0.5.1"
+rand_core = "0.6.4"
 
 crash-handler = { path = "../../common/crash-handler", version = "0.1.0" }
 consensus-types = { path = "../consensus-types", version = "0.1.0" }
diff --git a/crypto/crypto/Cargo.toml b/crypto/crypto/Cargo.toml
index af212c89005e..0fafd0344d7b 100644
--- a/crypto/crypto/Cargo.toml
+++ b/crypto/crypto/Cargo.toml
@@ -24,7 +24,7 @@ mirai-annotations = "1.10.1"
 proptest = { version = "0.10.1", optional = true }
 proptest-derive = { version = "0.2.0", optional = true }
 rand = "0.7.3"
-rand_core = { version = "0.5.1", default-features = false }
+rand_core = { version = "0.6.4", default-features = false }
 serde = { version = "1.0.117", features = ["derive"] }
 serde_bytes = "0.11.5"
 serde-name = "0.1.1"
diff --git a/network/Cargo.toml b/network/Cargo.toml
index 5d6883527cad..763f65bd001b 100644
--- a/network/Cargo.toml
+++ b/network/Cargo.toml
@@ -20,7 +20,7 @@ pin-project = "1.0.2"
 proptest = { version = "0.10.1", default-features = true, optional = true }
 proptest-derive = { version = "0.2.0", optional = true }
 rand = { version = "0.7.3", features = ["small_rng"] }
-rand_core = { version = "0.5.1", optional = true }
+rand_core = { version = "0.6.4", optional = true }
 serde = { version = "1.0.117", default-features = false }
 serde_bytes = "0.11.5"
 thiserror = "1.0.22"
@@ -54,7 +54,7 @@ memsocket = { path = "../network/memsocket", version = "0.1.0" }
 network-builder = {path = "../network/builder", version = "0.1.0"}
 proptest = { version = "0.10.1", default-features = true }
 proptest-derive = { version = "0.2.0" }
-rand_core = { version = "0.5.1" }
+rand_core = { version = "0.6.4" }
 serial_test = "0.5.1"
 socket-bench-server = { path = "../network/socket-bench-server", version = "0.1.0" }