diff --git a/Cargo.lock b/Cargo.lock
index 89e867142c44..5f91ebbf4b01 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1478,7 +1478,7 @@ dependencies = [
  "proptest",
  "proptest-derive",
  "rand 0.7.3",
- "rand_core 0.6.1",
+ "rand_core 0.6.4",
  "ripemd160",
  "serde",
  "serde-name",
@@ -2416,7 +2416,7 @@ dependencies = [
  "prost",
  "quote 0.6.13",
  "rand 0.7.3",
- "rand_core 0.6.1",
+ "rand_core 0.6.4",
  "reqwest",
  "rusty-fork",
  "serde",
@@ -4577,7 +4577,7 @@ dependencies = [
  "proptest",
  "proptest-derive",
  "rand 0.7.3",
- "rand_core 0.6.1",
+ "rand_core 0.6.4",
  "serde",
  "serde_bytes",
  "serial_test",
@@ -4968,7 +4968,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "721a49e14f1803441886c688ba8b653b52e1dcc926969081d22384e300ea4106"
 dependencies = [
  "base64ct",
- "rand_core 0.6.1",
+ "rand_core 0.6.4",
 ]
 
 [[package]]
@@ -5445,7 +5445,7 @@ checksum = "18519b42a40024d661e1714153e9ad0c3de27cd495760ceb09710920f1098b1e"
 dependencies = [
  "libc",
  "rand_chacha 0.3.0",
- "rand_core 0.6.1",
+ "rand_core 0.6.4",
  "rand_hc 0.3.0",
 ]
 
@@ -5476,7 +5476,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e12735cf05c9e10bf21534da50a147b924d555dc7a547c42e6bb2d5b6017ae0d"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.6.1",
+ "rand_core 0.6.4",
 ]
 
 [[package]]
@@ -5505,9 +5505,9 @@ dependencies = [
 
 [[package]]
 name = "rand_core"
-version = "0.6.1"
+version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c026d7df8b298d90ccbbc5190bd04d85e159eaf5576caeacf8741da93ccbd2e5"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
  "getrandom 0.2.2",
 ]
@@ -5536,7 +5536,7 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3190ef7066a446f2e7f42e239d161e905420ccab01eb967c9eb27d21b2322a73"
 dependencies = [
- "rand_core 0.6.1",
+ "rand_core 0.6.4",
 ]
 
 [[package]]
@@ -6083,7 +6083,7 @@ dependencies = [
  "once_cell",
  "proptest",
  "rand 0.7.3",
- "rand_core 0.6.1",
+ "rand_core 0.6.4",
  "serde",
  "tempfile",
  "thiserror",
diff --git a/common/workspace-hack/Cargo.toml b/common/workspace-hack/Cargo.toml
index 038dd07f0e43..b5d32eff60c4 100644
--- a/common/workspace-hack/Cargo.toml
+++ b/common/workspace-hack/Cargo.toml
@@ -38,7 +38,7 @@ once_cell = { version = "1.5.2", features = ["alloc", "default", "std"] }
 petgraph = { version = "0.5.1", features = ["default", "graphmap", "matrix_graph", "stable_graph"] }
 prost = { version = "0.7.0", features = ["default", "prost-derive", "std"] }
 rand = { version = "0.7.3", features = ["alloc", "default", "getrandom", "getrandom_package", "libc", "rand_pcg", "small_rng", "std"] }
-rand_core = { version = "0.6.1", default-features = false, features = ["alloc", "getrandom", "std"] }
+rand_core = { version = "0.6.4", default-features = false, features = ["alloc", "getrandom", "std"] }
 reqwest = { version = "0.11.0", features = ["__tls", "blocking", "default", "default-tls", "hyper-tls", "json", "native-tls", "native-tls-crate", "serde_json", "stream", "tokio-native-tls"] }
 rusty-fork = { version = "0.3.0", features = ["default", "timeout", "wait-timeout"] }
 serde = { version = "1.0.123", features = ["alloc", "default", "derive", "rc", "serde_derive", "std"] }
@@ -82,7 +82,7 @@ proc-macro2 = { version = "0.4.30", features = ["default", "proc-macro"] }
 prost = { version = "0.7.0", features = ["default", "prost-derive", "std"] }
 quote = { version = "0.6.13", features = ["default", "proc-macro"] }
 rand = { version = "0.7.3", features = ["alloc", "default", "getrandom", "getrandom_package", "libc", "rand_pcg", "small_rng", "std"] }
-rand_core = { version = "0.6.1", default-features = false, features = ["alloc", "getrandom", "std"] }
+rand_core = { version = "0.6.4", default-features = false, features = ["alloc", "getrandom", "std"] }
 reqwest = { version = "0.11.0", features = ["__tls", "blocking", "default", "default-tls", "hyper-tls", "json", "native-tls", "native-tls-crate", "serde_json", "stream", "tokio-native-tls"] }
 rusty-fork = { version = "0.3.0", features = ["default", "timeout", "wait-timeout"] }
 serde = { version = "1.0.123", features = ["alloc", "default", "derive", "rc", "serde_derive", "std"] }
@@ -125,7 +125,7 @@ once_cell = { version = "1.5.2", features = ["alloc", "default", "std"] }
 petgraph = { version = "0.5.1", features = ["default", "graphmap", "matrix_graph", "stable_graph"] }
 prost = { version = "0.7.0", features = ["default", "prost-derive", "std"] }
 rand = { version = "0.7.3", features = ["alloc", "default", "getrandom", "getrandom_package", "libc", "rand_pcg", "small_rng", "std"] }
-rand_core = { version = "0.6.1", default-features = false, features = ["alloc", "getrandom", "std"] }
+rand_core = { version = "0.6.4", default-features = false, features = ["alloc", "getrandom", "std"] }
 reqwest = { version = "0.11.0", features = ["__tls", "blocking", "default", "default-tls", "hyper-tls", "json", "native-tls", "native-tls-crate", "serde_json", "stream", "tokio-native-tls"] }
 rusty-fork = { version = "0.3.0", features = ["default", "timeout", "wait-timeout"] }
 serde = { version = "1.0.123", features = ["alloc", "default", "derive", "rc", "serde_derive", "std"] }
@@ -169,7 +169,7 @@ proc-macro2 = { version = "0.4.30", features = ["default", "proc-macro"] }
 prost = { version = "0.7.0", features = ["default", "prost-derive", "std"] }
 quote = { version = "0.6.13", features = ["default", "proc-macro"] }
 rand = { version = "0.7.3", features = ["alloc", "default", "getrandom", "getrandom_package", "libc", "rand_pcg", "small_rng", "std"] }
-rand_core = { version = "0.6.1", default-features = false, features = ["alloc", "getrandom", "std"] }
+rand_core = { version = "0.6.4", default-features = false, features = ["alloc", "getrandom", "std"] }
 reqwest = { version = "0.11.0", features = ["__tls", "blocking", "default", "default-tls", "hyper-tls", "json", "native-tls", "native-tls-crate", "serde_json", "stream", "tokio-native-tls"] }
 rusty-fork = { version = "0.3.0", features = ["default", "timeout", "wait-timeout"] }
 serde = { version = "1.0.123", features = ["alloc", "default", "derive", "rc", "serde_derive", "std"] }
diff --git a/consensus/safety-rules/Cargo.toml b/consensus/safety-rules/Cargo.toml
index de1fbf39dcca..e6300340667d 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 = "0.6.1"
+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 888c1d841de8..77f376eaf226 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 = "0.6.1", default-features = false }
+rand_core = { version = "0.6.4", default-features = false }
 serde = { version = "1.0.123", features = ["derive"] }
 serde_bytes = "0.11.5"
 serde-name = "0.1.1"
diff --git a/network/Cargo.toml b/network/Cargo.toml
index b54c34f3d211..510795c0b044 100644
--- a/network/Cargo.toml
+++ b/network/Cargo.toml
@@ -20,7 +20,7 @@ pin-project = "1.0.5"
 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 = "0.6.1", optional = true }
+rand_core = { version = "0.6.4", optional = true }
 serde = { version = "1.0.123", default-features = false }
 serde_bytes = "0.11.5"
 thiserror = "1.0.23"
@@ -58,7 +58,7 @@ memsocket = { path = "./memsocket", version = "0.1.0" }
 network-builder = {path = "./builder", version = "0.1.0"}
 proptest = { version = "0.10.1", default-features = true }
 proptest-derive = { version = "0.2.0" }
-rand_core = "0.6.1"
+rand_core = "0.6.4"
 serial_test = "0.5.1"
 socket-bench-server = { path = "./socket-bench-server", version = "0.1.0" }