diff --git a/beacon_node/lighthouse_network/src/rpc/codec/ssz_snappy.rs b/beacon_node/lighthouse_network/src/rpc/codec/ssz_snappy.rs
index fb07e6831..d69b42c0b 100644
--- a/beacon_node/lighthouse_network/src/rpc/codec/ssz_snappy.rs
+++ b/beacon_node/lighthouse_network/src/rpc/codec/ssz_snappy.rs
@@ -716,9 +716,10 @@ fn context_bytes_to_fork_name(
         .from_context_bytes(context_bytes)
         .cloned()
         .ok_or_else(|| {
+            let encoded = hex::encode(context_bytes);
             RPCError::ErrorResponse(
                 RPCResponseErrorCode::InvalidRequest,
-                "Context bytes does not correspond to a valid fork".to_string(),
+                format!("Context bytes {} do not correspond to a valid fork", encoded),
             )
         })
 }
diff --git a/common/eth2_network_config/built_in_network_configs/eip4844/boot_enr.yaml b/common/eth2_network_config/built_in_network_configs/eip4844/boot_enr.yaml
index 4d52cc597..143387543 100644
--- a/common/eth2_network_config/built_in_network_configs/eip4844/boot_enr.yaml
+++ b/common/eth2_network_config/built_in_network_configs/eip4844/boot_enr.yaml
@@ -1,3 +1,3 @@
-- enr:-MK4QLij8YaVQ6fIi09rDuD9fufxBlCZRXwfM1q6SbNJfy5ZZdAvtlnsfqhIeI0IqeOZdaPExVCfZfR4JJTIuKXFR76GAYJGrqHnh2F0dG5ldHOIAAAAAAAAAACEZXRoMpBCynldgwAP_QMAAAAAAAAAgmlkgnY0gmlwhCJ7uEyJc2VjcDI1NmsxoQJpeftU6RbmIhcFllICznlAMJXL3EwHEGhn73_Gk0wrCYhzeW5jbmV0cwCDdGNwgjLIg3VkcIIu4A
-- enr:-JG4QK27MZvV3QbwdLt055Yhei27SjAsDXMFGCdl-Q7SDiCgR_qbiW3BmcOClehFVJgMa6IfjHeJBdbC0jvrr2NycOqGAYJLWb5kgmlkgnY0gmlwhCJE_eeJc2VjcDI1NmsxoQIecO7Y9C7J2Bs7RNxXaUkU6BfmPKIhEsDScKAoxENaRYN0Y3CCdl-DdWRwgnZf
-- enr:-JG4QExcHW3vzBcE0f_r-93nSA4iBy4qNLthSyTw7p0tlPwjMl1JVTAgLSNHLLZJzOGtelJO4sw37LliuHyJ55zN5J6GAYJLWTvzgmlkgnY0gmlwhCKq1cmJc2VjcDI1NmsxoQJT2d4jtKQbHNw3tZPLhoMlR73o5LNdi-bk_bYq6siwuIN0Y3CCdl-DdWRwgnZf
\ No newline at end of file
+- enr:-MK4QFnkGjrt5qw5Ct5XXT9QYvfqmH8Cf6xqKuczTHWixDUZQmngyLrlftv-tMRbXDAxZZQDxNciNTjx7XpW0G4yQguGAYU2Pmnxh2F0dG5ldHOIAAAAAAAAAACEZXRoMpA3FbaXIAAAk___________gmlkgnY0gmlwhCJ5ITWJc2VjcDI1NmsxoQIlwaxycUgJ_Ht4lYdDlInbIuRxu0HcHcFbu0D7As2SLYhzeW5jbmV0cwCDdGNwgjLIg3VkcIIu4A
+- enr:-MK4QBqN5McD5YYgfEnfQjWUvrSaCITjBvQevlP5q0nCVbKuZRoa2XvGWOBwTDQyLNYiqgeettVwXs0PrSc1rOY2rjKGAYU2M7A8h2F0dG5ldHOIAAAAAAAAAgCEZXRoMpA3FbaXIAAAk___________gmlkgnY0gmlwhCJ6vpeJc2VjcDI1NmsxoQNJzjxNKr7-a-iEDs0KvaL_vo1UH91kefEiWzgAdwSntYhzeW5jbmV0cw-DdGNwgjLIg3VkcIIu4A
+- enr:-MK4QEzb6r0hpSyiko9u-mbEX1TzdTD9RcSiU4jhey5jJbTAHLdXNFR32CfjingVa6QMyCPtZRUfzSGbJ0ur3-Pdxe-GAYU2OwM5h2F0dG5ldHOIAAAAAAAAAACEZXRoMpA3FbaXIAAAk___________gmlkgnY0gmlwhCPi7faJc2VjcDI1NmsxoQIKBTGU_riCSYrscdRCLuocbNzhF9RTNItPfD4_PmYngIhzeW5jbmV0cwCDdGNwgjLIg3VkcIIu4A
diff --git a/common/eth2_network_config/built_in_network_configs/eip4844/config.yaml b/common/eth2_network_config/built_in_network_configs/eip4844/config.yaml
index d6e6aef57..d5e185591 100644
--- a/common/eth2_network_config/built_in_network_configs/eip4844/config.yaml
+++ b/common/eth2_network_config/built_in_network_configs/eip4844/config.yaml
@@ -1,27 +1,22 @@
-# Prater config
-
-# Extends the mainnet preset
-CONFIG_NAME: 'eip4844'
-PRESET_BASE: 'mainnet'
+CONFIG_NAME: testnet
+PRESET_BASE: mainnet
 
 # Transition
 # ---------------------------------------------------------------
-TERMINAL_TOTAL_DIFFICULTY: 40
+TERMINAL_TOTAL_DIFFICULTY: 2
 # By default, don't use these params
 TERMINAL_BLOCK_HASH: 0x0000000000000000000000000000000000000000000000000000000000000000
 TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH: 18446744073709551615
 
 # Genesis
 # ---------------------------------------------------------------
-# `2**14` (= 16,384)
+# The genesis fork version looks weird for legacy reasons
 MIN_GENESIS_ACTIVE_VALIDATOR_COUNT: 2
-# Mar-01-2021 08:53:32 AM +UTC
-MIN_GENESIS_TIME: 1653318000
-# Prater area code (Vienna)
+# Dec 1, 2020, 12pm UTC
+MIN_GENESIS_TIME: 1606824000
 GENESIS_FORK_VERSION: 0x00000ffd
-# Customized for Prater: 1919188 seconds (Mar-23-2021 02:00:00 PM +UTC)
-GENESIS_DELAY: 0
-
+# 604800 seconds (7 days)
+GENESIS_DELAY: 604800
 
 # Forking
 # ---------------------------------------------------------------
@@ -30,18 +25,21 @@ GENESIS_DELAY: 0
 #  - Temporarily set to max uint64 value: 2**64 - 1
 
 # Altair
-ALTAIR_FORK_VERSION: 0x01000ffd
-ALTAIR_FORK_EPOCH: 1
+ALTAIR_FORK_EPOCH: 2
+ALTAIR_FORK_VERSION: 0x20000090
+
 # Merge
-BELLATRIX_FORK_VERSION: 0x02000ffd
-BELLATRIX_FORK_EPOCH: 2
-# Sharding
-EIP4844_FORK_VERSION: 0x83000ffd
-EIP4844_FORK_EPOCH: 3
+BELLATRIX_FORK_EPOCH: 3
+BELLATRIX_FORK_VERSION: 0x20000091
 
-# TBD, 2**32 is a placeholder. Merge transition approach is in active R&D.
-TRANSITION_TOTAL_DIFFICULTY: 40
+# Capella
+CAPELLA_FORK_EPOCH: 4
+CAPELLA_FORK_VERSION: 0x20000092
+MAX_WITHDRAWALS_PER_PAYLOAD: 4
 
+# EIP4844
+EIP4844_FORK_EPOCH: 5
+EIP4844_FORK_VERSION: 0x20000093
 
 # Time parameters
 # ---------------------------------------------------------------
@@ -53,9 +51,7 @@ SECONDS_PER_ETH1_BLOCK: 14
 MIN_VALIDATOR_WITHDRAWABILITY_DELAY: 256
 # 2**8 (= 256) epochs ~27 hours
 SHARD_COMMITTEE_PERIOD: 256
-# 2**11 (= 2,048) Eth1 blocks ~8 hours
-ETH1_FOLLOW_DISTANCE: 15
-
+ETH1_FOLLOW_DISTANCE: 1
 
 # Validator cycle
 # ---------------------------------------------------------------
@@ -70,7 +66,6 @@ MIN_PER_EPOCH_CHURN_LIMIT: 4
 # 2**16 (= 65,536)
 CHURN_LIMIT_QUOTIENT: 65536
 
-
 # Fork choice
 # ---------------------------------------------------------------
 # 40%
@@ -78,8 +73,7 @@ PROPOSER_SCORE_BOOST: 40
 
 # Deposit contract
 # ---------------------------------------------------------------
-# Ethereum Goerli testnet
+DEPOSIT_CONTRACT_ADDRESS: 0x4242424242424242424242424242424242424242
 DEPOSIT_CHAIN_ID: 1331
-DEPOSIT_NETWORK_ID: 69
-# Prater test deposit contract on Goerli Testnet
-DEPOSIT_CONTRACT_ADDRESS: 0x8A04d14125D0FDCDc742F4A05C051De07232EDa4
+DEPOSIT_NETWORK_ID: 1331
+
diff --git a/common/eth2_network_config/built_in_network_configs/eip4844/genesis.ssz.zip b/common/eth2_network_config/built_in_network_configs/eip4844/genesis.ssz.zip
index 88b405071..06c1b45fd 100644
Binary files a/common/eth2_network_config/built_in_network_configs/eip4844/genesis.ssz.zip and b/common/eth2_network_config/built_in_network_configs/eip4844/genesis.ssz.zip differ