diff --git a/bolt-sidecar/Cargo.lock b/bolt-sidecar/Cargo.lock
index 55680741..83eeaa68 100644
--- a/bolt-sidecar/Cargo.lock
+++ b/bolt-sidecar/Cargo.lock
@@ -338,7 +338,7 @@ dependencies = [
  "alloy-rlp",
  "alloy-serde 0.2.1",
  "c-kzg",
- "ethereum_ssz",
+ "ethereum_ssz 0.5.4",
  "ethereum_ssz_derive",
  "once_cell",
  "serde",
@@ -535,7 +535,7 @@ dependencies = [
  "cfg-if",
  "const-hex",
  "derive_more 0.99.18",
- "ethereum_ssz",
+ "ethereum_ssz 0.5.4",
  "hex-literal",
  "itoa",
  "k256 0.13.4",
@@ -787,7 +787,7 @@ dependencies = [
  "alloy-eips 0.2.1",
  "alloy-primitives 0.7.7",
  "alloy-rpc-types-engine 0.2.1",
- "ethereum_ssz",
+ "ethereum_ssz 0.5.4",
  "ethereum_ssz_derive",
  "serde",
  "serde_with",
@@ -821,7 +821,7 @@ dependencies = [
  "alloy-rlp",
  "alloy-rpc-types-eth 0.2.1",
  "alloy-serde 0.2.1",
- "ethereum_ssz",
+ "ethereum_ssz 0.5.4",
  "ethereum_ssz_derive",
  "jsonwebtoken",
  "rand 0.8.5",
@@ -1881,8 +1881,8 @@ dependencies = [
  "blst",
  "ethereum-types 0.14.1",
  "ethereum_hashing 0.6.0",
- "ethereum_serde_utils",
- "ethereum_ssz",
+ "ethereum_serde_utils 0.5.2",
+ "ethereum_ssz 0.5.4",
  "hex",
  "rand 0.8.5",
  "serde",
@@ -1899,8 +1899,8 @@ dependencies = [
  "blst",
  "ethereum-types 0.14.1",
  "ethereum_hashing 0.6.0",
- "ethereum_serde_utils",
- "ethereum_ssz",
+ "ethereum_serde_utils 0.5.2",
+ "ethereum_ssz 0.5.4",
  "hex",
  "rand 0.8.5",
  "serde",
@@ -1942,7 +1942,7 @@ dependencies = [
  "dotenvy",
  "eth2_keystore 0.1.0 (git+https://github.com/sigp/lighthouse?rev=a87f19d)",
  "ethereum-consensus",
- "ethereum_ssz",
+ "ethereum_ssz 0.8.0",
  "eyre",
  "futures",
  "hex",
@@ -2052,7 +2052,7 @@ source = "git+https://github.com/sigp/lighthouse?rev=a87f19d#a87f19d801a57b1d6ff
 dependencies = [
  "ethereum-types 0.14.1",
  "ethereum_hashing 0.6.0",
- "ethereum_ssz",
+ "ethereum_ssz 0.5.4",
  "ethereum_ssz_derive",
  "smallvec",
  "ssz_types 0.6.0",
@@ -2093,8 +2093,8 @@ dependencies = [
  "derive_more 1.0.0",
  "eth2_keystore 0.1.0 (git+https://github.com/sigp/lighthouse?rev=9e12c21f268c80a3f002ae0ca27477f9f512eb6f)",
  "ethereum-types 0.14.1",
- "ethereum_serde_utils",
- "ethereum_ssz",
+ "ethereum_serde_utils 0.5.2",
+ "ethereum_ssz 0.5.4",
  "ethereum_ssz_derive",
  "eyre",
  "k256 0.13.4",
@@ -2323,7 +2323,7 @@ dependencies = [
  "dirs",
  "eth2_network_config",
  "ethereum-types 0.14.1",
- "ethereum_ssz",
+ "ethereum_ssz 0.5.4",
  "hex",
  "serde",
  "serde_json",
@@ -2841,7 +2841,7 @@ version = "0.2.0"
 source = "git+https://github.com/sigp/lighthouse?rev=a87f19d#a87f19d801a57b1d6ff101750840294c210ff956"
 dependencies = [
  "ethabi 16.0.0",
- "ethereum_ssz",
+ "ethereum_ssz 0.5.4",
  "hex",
  "reqwest 0.11.27",
  "serde_json",
@@ -3574,6 +3574,19 @@ dependencies = [
  "serde_json",
 ]
 
+[[package]]
+name = "ethereum_serde_utils"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70cbccfccf81d67bff0ab36e591fa536c8a935b078a7b0e58c1d00d418332fc9"
+dependencies = [
+ "alloy-primitives 0.8.12",
+ "hex",
+ "serde",
+ "serde_derive",
+ "serde_json",
+]
+
 [[package]]
 name = "ethereum_ssz"
 version = "0.5.4"
@@ -3585,6 +3598,22 @@ dependencies = [
  "smallvec",
 ]
 
+[[package]]
+name = "ethereum_ssz"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bfbba28f4f3f32d92c06a64f5bf6c4537b5d4e21f28c689bd2bbaecfea4e0d3e"
+dependencies = [
+ "alloy-primitives 0.8.12",
+ "derivative",
+ "ethereum_serde_utils 0.7.0",
+ "itertools 0.13.0",
+ "serde",
+ "serde_derive",
+ "smallvec",
+ "typenum",
+]
+
 [[package]]
 name = "ethereum_ssz_derive"
 version = "0.5.4"
@@ -4889,8 +4918,8 @@ dependencies = [
  "c-kzg",
  "derivative",
  "ethereum_hashing 0.6.0",
- "ethereum_serde_utils",
- "ethereum_ssz",
+ "ethereum_serde_utils 0.5.2",
+ "ethereum_ssz 0.5.4",
  "ethereum_ssz_derive",
  "hex",
  "serde",
@@ -5371,7 +5400,7 @@ dependencies = [
  "derivative",
  "ethereum-types 0.14.1",
  "ethereum_hashing 0.6.0",
- "ethereum_ssz",
+ "ethereum_ssz 0.5.4",
  "ethereum_ssz_derive",
  "itertools 0.10.5",
  "parking_lot 0.12.3",
@@ -6887,7 +6916,7 @@ dependencies = [
  "ark-ff 0.3.0",
  "ark-ff 0.4.2",
  "bytes",
- "ethereum_ssz",
+ "ethereum_ssz 0.5.4",
  "fastrlp",
  "num-bigint",
  "num-traits",
@@ -7798,8 +7827,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "382939886cb24ee8ac885d09116a60f6262d827c7a9e36012b4f6d3d0116d0b3"
 dependencies = [
  "derivative",
- "ethereum_serde_utils",
- "ethereum_ssz",
+ "ethereum_serde_utils 0.5.2",
+ "ethereum_ssz 0.5.4",
  "itertools 0.10.5",
  "serde",
  "serde_derive",
@@ -7816,8 +7845,8 @@ checksum = "625b20de2d4b3891e6972f4ce5061cb11bd52b3479270c4b177c134b571194a9"
 dependencies = [
  "arbitrary",
  "derivative",
- "ethereum_serde_utils",
- "ethereum_ssz",
+ "ethereum_serde_utils 0.5.2",
+ "ethereum_ssz 0.5.4",
  "itertools 0.10.5",
  "serde",
  "serde_derive",
@@ -8667,8 +8696,8 @@ dependencies = [
  "eth2_interop_keypairs",
  "ethereum-types 0.14.1",
  "ethereum_hashing 0.6.0",
- "ethereum_serde_utils",
- "ethereum_ssz",
+ "ethereum_serde_utils 0.5.2",
+ "ethereum_ssz 0.5.4",
  "ethereum_ssz_derive",
  "hex",
  "int_to_bytes",
diff --git a/bolt-sidecar/Cargo.toml b/bolt-sidecar/Cargo.toml
index 575bcef4..ae02d634 100644
--- a/bolt-sidecar/Cargo.toml
+++ b/bolt-sidecar/Cargo.toml
@@ -24,7 +24,7 @@ tree_hash = "0.5"
 tree_hash_derive = "0.5"
 secp256k1 = { version = "0.29.0", features = ["rand"] }
 ssz_rs = { git = "https://github.com/ralexstokes/ssz-rs", rev = "ec3073e" }
-ethereum_ssz = "0.5"
+ethereum_ssz = "0.8"
 
 # alloy
 alloy = { version = "0.7.2", features = [