diff --git a/Cargo.lock b/Cargo.lock
index e5cd4c289..3a7672b78 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -333,7 +333,7 @@ dependencies = [
  "hkdf",
  "memmap2",
  "proptest",
- "rand 0.8.5",
+ "rand 0.9.2",
  "rand_chacha 0.3.1",
  "rayon",
  "renacer",
@@ -385,7 +385,7 @@ dependencies = [
  "csv",
  "predicates",
  "proptest",
- "rand 0.8.5",
+ "rand 0.9.2",
  "rand_chacha 0.3.1",
  "serde",
  "serde_json",
@@ -420,7 +420,7 @@ dependencies = [
  "criterion",
  "predicates",
  "proptest",
- "rand 0.8.5",
+ "rand 0.9.2",
  "tempfile",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index 902c1f484..b53888be5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -86,7 +86,7 @@ bincode = "1.3"
 rmp-serde = "1.3"  # MessagePack for .apr metadata (spec §2)
 
 # Random number generation for model_selection
-rand = "0.8"
+rand = "0.9"
 rand_chacha = "0.3"  # ChaCha20 PRNG for Monte Carlo simulations
 
 # Audio processing
diff --git a/crates/aprender-monte-carlo/Cargo.toml b/crates/aprender-monte-carlo/Cargo.toml
index 99a103f54..f4be1fa0d 100644
--- a/crates/aprender-monte-carlo/Cargo.toml
+++ b/crates/aprender-monte-carlo/Cargo.toml
@@ -21,7 +21,7 @@ path = "src/main.rs"
 [dependencies]
 aprender = "0.15"
 clap = { version = "4", features = ["derive"] }
-rand = "0.8"
+rand = "0.9"
 rand_chacha = "0.3"
 csv = "1.3"
 chrono = { version = "0.4", features = ["serde"] }
diff --git a/crates/aprender-tsp/Cargo.toml b/crates/aprender-tsp/Cargo.toml
index 8dfc98a5e..01d4a0451 100644
--- a/crates/aprender-tsp/Cargo.toml
+++ b/crates/aprender-tsp/Cargo.toml
@@ -21,7 +21,7 @@ path = "src/main.rs"
 [dependencies]
 aprender = "0.15"
 clap = { version = "4", features = ["derive"] }
-rand = "0.8"
+rand = "0.9"
 crc32fast = "1.4"
 
 [dev-dependencies]