diff --git a/Cargo.lock b/Cargo.lock
index c7a6292..4ece907 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -212,7 +212,7 @@ version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "444858eca984a7bed8261ab5b9ba5543973c9d23fa5b1af5eecabf79322a83b2"
 dependencies = [
- "bincode",
+ "bincode 1.3.3",
  "nalgebra",
  "rand 0.8.5",
  "rayon",
@@ -227,7 +227,7 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2226e341203063cf1685ff3721aee5ea3b3d5459a0b658ad0328d244b646a038"
 dependencies = [
- "bincode",
+ "bincode 1.3.3",
  "getrandom 0.2.16",
  "memmap2",
  "nalgebra",
@@ -246,7 +246,7 @@ dependencies = [
  "aes-gcm",
  "alimentar",
  "argon2",
- "bincode",
+ "bincode 2.0.1",
  "criterion",
  "dirs 6.0.0",
  "ed25519-dalek",
@@ -270,11 +270,35 @@ dependencies = [
  "zstd",
 ]
 
+[[package]]
+name = "aprender"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c2b4fbf4854f8427a8fd256cc8568992acbb678dacdfa4ca0be3427ad433fae"
+dependencies = [
+ "aes-gcm",
+ "argon2",
+ "bincode 1.3.3",
+ "getrandom 0.2.16",
+ "hkdf",
+ "memmap2",
+ "nalgebra",
+ "rand 0.8.5",
+ "rayon",
+ "rmp-serde",
+ "serde",
+ "serde_json",
+ "sha2",
+ "trueno",
+ "x25519-dalek",
+ "zstd",
+]
+
 [[package]]
 name = "aprender-shell"
 version = "0.2.1"
 dependencies = [
- "aprender 0.14.0",
+ "aprender 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "assert_cmd",
  "clap",
  "criterion",
@@ -291,7 +315,7 @@ dependencies = [
 name = "aprender-tsp"
 version = "0.1.1"
 dependencies = [
- "aprender 0.14.0",
+ "aprender 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "assert_cmd",
  "clap",
  "crc32fast",
@@ -627,6 +651,26 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "bincode"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "36eaf5d7b090263e8150820482d5d93cd964a81e4019913c972f4edcc6edb740"
+dependencies = [
+ "bincode_derive",
+ "serde",
+ "unty",
+]
+
+[[package]]
+name = "bincode_derive"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bf95709a440f45e986983918d0e8a1f30a9b1df04918fc828670606804ac3c09"
+dependencies = [
+ "virtue",
+]
+
 [[package]]
 name = "bit-set"
 version = "0.8.0"
@@ -4161,6 +4205,12 @@ version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ecb6da28b8a351d773b68d5825ac39017e680750f980f3a1a85cd8dd28a47c1"
 
+[[package]]
+name = "unty"
+version = "0.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d49784317cd0d1ee7ec5c716dd598ec5b4483ea832a2dced265471cc0f690ae"
+
 [[package]]
 name = "ureq"
 version = "2.12.1"
@@ -4216,6 +4266,12 @@ version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
 
+[[package]]
+name = "virtue"
+version = "0.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "051eb1abcf10076295e815102942cc58f9d5e3b4560e46e53c21e8ff6f3af7b1"
+
 [[package]]
 name = "wait-timeout"
 version = "0.2.1"
diff --git a/Cargo.toml b/Cargo.toml
index 94b8cc0..78a2b90 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -82,7 +82,7 @@ workspace = true
 # Serialization
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"  # SafeTensors JSON metadata
-bincode = "1.3"
+bincode = "2.0"
 rmp-serde = "1.3"  # MessagePack for .apr metadata (spec §2)
 
 # Random number generation for model_selection