diff --git a/book/src/testnet-validator.md b/book/src/testnet-validator.md
index 58e2912e1..1e362f116 100644
--- a/book/src/testnet-validator.md
+++ b/book/src/testnet-validator.md
@@ -12,7 +12,7 @@ DEPOSITS WITH LIGHTHOUSE. 🚨🚨🚨**
 Lighthouse supports four testnets:
 
 - [Medalla](https://github.com/goerli/medalla/tree/master/medalla) (default)
-- [Zinken](https://github.com/goerli/medalla/tree/master/zinken)
+- [Pyrmont](https://github.com/protolambda/pyrmont)
 - [Spadina](https://github.com/goerli/medalla/tree/master/spadina) (deprecated)
 - [Altona](https://github.com/goerli/medalla/tree/master/altona) (deprecated)
 
@@ -20,7 +20,7 @@ When using Lighthouse, the `--testnet` flag selects a testnet. E.g.,
 
 - `lighthouse` (no flag): Medalla.
 - `lighthouse --testnet medalla`: Medalla.
-- `lighthouse --testnet zinken`: Zinken.
+- `lighthouse --testnet pyrmont`: Pyrmont.
 
 Using the correct `--testnet` flag is very important; using the wrong flag can
 result in penalties, slashings or lost deposits. As a rule of thumb, always
@@ -48,7 +48,7 @@ setting aside one or two hours for this process.
 The Ethereum Foundation provides an "Eth2 launch pad" for each active testnet:
 
 - [Medalla launchpad](https://medalla.launchpad.ethereum.org/)
-- [Zinken launchpad](https://zinken.launchpad.ethereum.org/)
+- [Pyrmont launchpad](https://pyrmont.launchpad.ethereum.org/)
 
 Please follow the steps on the appropriate launch pad site to generate
 validator keys and submit deposits. Make sure you select "Lighthouse" as your
@@ -120,7 +120,7 @@ lighthouse --testnet MY_TESTNET vc
 ```
 
 > Note: `~/.lighthouse/{testnet}` is the default directory which contains the keys and databases.
-> To specify a custom dir, see [this](#custom-directories) section 
+> To specify a custom dir, see [this](#custom-directories) section
 
 #### Docker users
 
@@ -173,7 +173,7 @@ Happy staking!
 
 Users can override the default Lighthouse data directories (`~/.lighthouse/{testnet}`) using the `--datadir` flag. The custom data directory mirrors the structure of any testnet specific default directory (e.g. `~/.lighthouse/medalla`).
 
-> Note: Users should specify different custom directories for different testnets. 
+> Note: Users should specify different custom directories for different testnets.
 
 Below is an example flow for importing validator keys, running a beacon node and validator client using a custom data directory `/var/lib/my-custom-dir` for the medalla testnet.
 
@@ -182,5 +182,5 @@ lighthouse --testnet medalla --datadir /var/lib/my-custom-dir account validator
 lighthouse --testnet medalla --datadir /var/lib/my-custom-dir bn --staking
 lighthouse --testnet medalla --datadir /var/lib/my-custom-dir vc
 ```
-The first step creates a `validators` directory under `/var/lib/my-custom-dir` which contains the imported keys and [`validator_definitions.yml`](./validator-management.md). 
-After that, we simply run the beacon chain and validator client with the custom dir path. 
\ No newline at end of file
+The first step creates a `validators` directory under `/var/lib/my-custom-dir` which contains the imported keys and [`validator_definitions.yml`](./validator-management.md).
+After that, we simply run the beacon chain and validator client with the custom dir path.
\ No newline at end of file
diff --git a/book/src/voluntary-exit.md b/book/src/voluntary-exit.md
index 69e3da5ca..7105de444 100644
--- a/book/src/voluntary-exit.md
+++ b/book/src/voluntary-exit.md
@@ -39,13 +39,13 @@ The exit phrase is the following:
 
 
 
-Below is an example for initiating a voluntary exit on the zinken testnet.
+Below is an example for initiating a voluntary exit on the Pyrmont testnet.
 
 ```
-$ lighthouse --testnet zinken account validator exit --keystore /path/to/keystore --beacon-node http://localhost:5052
+$ lighthouse --testnet pyrmont account validator exit --keystore /path/to/keystore --beacon-node http://localhost:5052
 
-Running account manager for zinken testnet
-validator-dir path: ~/.lighthouse/zinken/validators
+Running account manager for pyrmont testnet
+validator-dir path: ~/.lighthouse/pyrmont/validators
 
 Enter the keystore password for validator in 0xabcd
 
diff --git a/common/eth2_config/src/lib.rs b/common/eth2_config/src/lib.rs
index 2f4511f2d..ed3a5bb19 100644
--- a/common/eth2_config/src/lib.rs
+++ b/common/eth2_config/src/lib.rs
@@ -120,7 +120,7 @@ define_net!(medalla, include_medalla_file, "medalla", true);
 
 define_net!(spadina, include_spadina_file, "spadina", true);
 
-define_net!(zinken, include_zinken_file, "zinken", true);
+define_net!(pyrmont, include_pyrmont_file, "pyrmont", true);
 
 define_net!(mainnet, include_mainnet_file, "mainnet", false);
 
diff --git a/common/eth2_testnet_config/build.rs b/common/eth2_testnet_config/build.rs
index 67706edd7..6070c3a13 100644
--- a/common/eth2_testnet_config/build.rs
+++ b/common/eth2_testnet_config/build.rs
@@ -1,7 +1,8 @@
 //! Downloads a testnet configuration from Github.
 
 use eth2_config::{
-    altona, medalla, spadina, toledo, zinken, Eth2NetArchiveAndDirectory, GENESIS_FILE_NAME,
+    altona, mainnet, medalla, pyrmont, spadina, toledo, Eth2NetArchiveAndDirectory,
+    GENESIS_FILE_NAME,
 };
 use std::fs::File;
 use std::io;
@@ -11,7 +12,8 @@ const ETH2_NET_DIRS: &[Eth2NetArchiveAndDirectory<'static>] = &[
     altona::ETH2_NET_DIR,
     medalla::ETH2_NET_DIR,
     spadina::ETH2_NET_DIR,
-    zinken::ETH2_NET_DIR,
+    mainnet::ETH2_NET_DIR,
+    pyrmont::ETH2_NET_DIR,
     toledo::ETH2_NET_DIR,
 ];
 
@@ -29,14 +31,14 @@ fn main() {
 
 /// Uncompress the testnet configs archive into a testnet configs folder.
 fn uncompress_state(testnet: &Eth2NetArchiveAndDirectory<'static>) -> Result<(), String> {
-    let archive_path = testnet.genesis_state_archive();
-    let archive_file = File::open(&archive_path)
-        .map_err(|e| format!("Failed to open archive file {:?}: {:?}", archive_path, e))?;
-
-    let mut archive =
-        ZipArchive::new(archive_file).map_err(|e| format!("Error with zip file: {}", e))?;
-
     if testnet.genesis_is_known {
+        let archive_path = testnet.genesis_state_archive();
+        let archive_file = File::open(&archive_path)
+            .map_err(|e| format!("Failed to open archive file {:?}: {:?}", archive_path, e))?;
+
+        let mut archive =
+            ZipArchive::new(archive_file).map_err(|e| format!("Error with zip file: {}", e))?;
+
         let mut file = archive.by_name(GENESIS_FILE_NAME).map_err(|e| {
             format!(
                 "Error retrieving file {} inside zip: {}",
diff --git a/common/eth2_testnet_config/built_in_testnet_configs/pyrmont/boot_enr.yaml b/common/eth2_testnet_config/built_in_testnet_configs/pyrmont/boot_enr.yaml
new file mode 100644
index 000000000..8824fdd1f
--- /dev/null
+++ b/common/eth2_testnet_config/built_in_testnet_configs/pyrmont/boot_enr.yaml
@@ -0,0 +1,4 @@
+# @protolambda bootnode 1
+- enr:-Ku4QOA5OGWObY8ep_x35NlGBEj7IuQULTjkgxC_0G1AszqGEA0Wn2RNlyLFx9zGTNB1gdFBA6ZDYxCgIza1uJUUOj4Dh2F0dG5ldHOIAAAAAAAAAACEZXRoMpDVTPWXAAAgCf__________gmlkgnY0gmlwhDQPSjiJc2VjcDI1NmsxoQM6yTQB6XGWYJbI7NZFBjp4Yb9AYKQPBhVrfUclQUobb4N1ZHCCIyg
+# @protolambda bootnode 2
+- enr:-Ku4QOksdA2tabOGrfOOr6NynThMoio6Ggka2oDPqUuFeWCqcRM2alNb8778O_5bK95p3EFt0cngTUXm2H7o1jkSJ_8Dh2F0dG5ldHOIAAAAAAAAAACEZXRoMpDVTPWXAAAgCf__________gmlkgnY0gmlwhDaa13aJc2VjcDI1NmsxoQKdNQJvnohpf0VO0ZYCAJxGjT0uwJoAHbAiBMujGjK0SoN1ZHCCIyg
diff --git a/common/eth2_testnet_config/built_in_testnet_configs/pyrmont/config.yaml b/common/eth2_testnet_config/built_in_testnet_configs/pyrmont/config.yaml
new file mode 100644
index 000000000..f9d1b92be
--- /dev/null
+++ b/common/eth2_testnet_config/built_in_testnet_configs/pyrmont/config.yaml
@@ -0,0 +1,154 @@
+# Pyrmont preset
+CONFIG_NAME: "pyrmont"
+
+# Misc
+# ---------------------------------------------------------------
+# 2**6 (= 64)
+MAX_COMMITTEES_PER_SLOT: 64
+# 2**7 (= 128)
+TARGET_COMMITTEE_SIZE: 128
+# 2**11 (= 2,048)
+MAX_VALIDATORS_PER_COMMITTEE: 2048
+# 2**2 (= 4)
+MIN_PER_EPOCH_CHURN_LIMIT: 4
+# 2**16 (= 65,536)
+CHURN_LIMIT_QUOTIENT: 65536
+# See issue 563
+SHUFFLE_ROUND_COUNT: 90
+# `2**14` (= 16,384)
+MIN_GENESIS_ACTIVE_VALIDATOR_COUNT: 16384
+# Nov 18, 2020, 12pm UTC
+MIN_GENESIS_TIME: 1605700800
+# 4
+HYSTERESIS_QUOTIENT: 4
+# 1 (minus 0.25)
+HYSTERESIS_DOWNWARD_MULTIPLIER: 1
+# 5 (plus 1.25)
+HYSTERESIS_UPWARD_MULTIPLIER: 5
+
+
+# Fork Choice
+# ---------------------------------------------------------------
+# 2**3 (= 8)
+SAFE_SLOTS_TO_UPDATE_JUSTIFIED: 8
+
+
+# Validator
+# ---------------------------------------------------------------
+# 2**11 (= 2,048)
+ETH1_FOLLOW_DISTANCE: 2048
+# 2**4 (= 16)
+TARGET_AGGREGATORS_PER_COMMITTEE: 16
+# 2**0 (= 1)
+RANDOM_SUBNETS_PER_VALIDATOR: 1
+# 2**8 (= 256)
+EPOCHS_PER_RANDOM_SUBNET_SUBSCRIPTION: 256
+# 14 (estimate from Eth1 mainnet)
+SECONDS_PER_ETH1_BLOCK: 14
+
+
+# Deposit contract
+# ---------------------------------------------------------------
+# Ethereum Goerli testnet
+DEPOSIT_CHAIN_ID: 5
+DEPOSIT_NETWORK_ID: 5
+# Pyrmont test deposit contract on Goerli (2nd edition, 0x00002009 fork version)
+DEPOSIT_CONTRACT_ADDRESS: 0x8c5fecdC472E27Bc447696F431E425D02dd46a8c
+
+
+# Gwei values
+# ---------------------------------------------------------------
+# 2**0 * 10**9 (= 1,000,000,000) Gwei
+MIN_DEPOSIT_AMOUNT: 1000000000
+# 2**5 * 10**9 (= 32,000,000,000) Gwei
+MAX_EFFECTIVE_BALANCE: 32000000000
+# 2**4 * 10**9 (= 16,000,000,000) Gwei
+EJECTION_BALANCE: 16000000000
+# 2**0 * 10**9 (= 1,000,000,000) Gwei
+EFFECTIVE_BALANCE_INCREMENT: 1000000000
+
+
+# Initial values
+# ---------------------------------------------------------------
+# Pyrmont area code
+GENESIS_FORK_VERSION: 0x00002009
+BLS_WITHDRAWAL_PREFIX: 0x00
+
+
+# Time parameters
+# ---------------------------------------------------------------
+# Customized for Pyrmont: 432000 seconds (5 days)
+GENESIS_DELAY: 432000
+# 12 seconds
+SECONDS_PER_SLOT: 12
+# 2**0 (= 1) slots 12 seconds
+MIN_ATTESTATION_INCLUSION_DELAY: 1
+# 2**5 (= 32) slots 6.4 minutes
+SLOTS_PER_EPOCH: 32
+# 2**0 (= 1) epochs 6.4 minutes
+MIN_SEED_LOOKAHEAD: 1
+# 2**2 (= 4) epochs 25.6 minutes
+MAX_SEED_LOOKAHEAD: 4
+# 2**6 (= 64) epochs ~6.8 hours
+EPOCHS_PER_ETH1_VOTING_PERIOD: 64
+# 2**13 (= 8,192) slots ~13 hours
+SLOTS_PER_HISTORICAL_ROOT: 8192
+# 2**8 (= 256) epochs ~27 hours
+MIN_VALIDATOR_WITHDRAWABILITY_DELAY: 256
+# 2**8 (= 256) epochs ~27 hours
+SHARD_COMMITTEE_PERIOD: 256
+# 2**2 (= 4) epochs 25.6 minutes
+MIN_EPOCHS_TO_INACTIVITY_PENALTY: 4
+
+
+# State vector lengths
+# ---------------------------------------------------------------
+# 2**16 (= 65,536) epochs ~0.8 years
+EPOCHS_PER_HISTORICAL_VECTOR: 65536
+# 2**13 (= 8,192) epochs ~36 days
+EPOCHS_PER_SLASHINGS_VECTOR: 8192
+# 2**24 (= 16,777,216) historical roots, ~26,131 years
+HISTORICAL_ROOTS_LIMIT: 16777216
+# 2**40 (= 1,099,511,627,776) validator spots
+VALIDATOR_REGISTRY_LIMIT: 1099511627776
+
+
+# Reward and penalty quotients
+# ---------------------------------------------------------------
+# 2**6 (= 64)
+BASE_REWARD_FACTOR: 64
+# 2**9 (= 512)
+WHISTLEBLOWER_REWARD_QUOTIENT: 512
+# 2**3 (= 8)
+PROPOSER_REWARD_QUOTIENT: 8
+# 2**26 (= 67,108,864)
+INACTIVITY_PENALTY_QUOTIENT: 67108864
+# 2**7 (= 128) (lower safety margin at Phase 0 genesis)
+MIN_SLASHING_PENALTY_QUOTIENT: 128
+# 1 (lower safety margin at Phase 0 genesis)
+PROPORTIONAL_SLASHING_MULTIPLIER: 1
+
+
+# Max operations per block
+# ---------------------------------------------------------------
+# 2**4 (= 16)
+MAX_PROPOSER_SLASHINGS: 16
+# 2**1 (= 2)
+MAX_ATTESTER_SLASHINGS: 2
+# 2**7 (= 128)
+MAX_ATTESTATIONS: 128
+# 2**4 (= 16)
+MAX_DEPOSITS: 16
+# 2**4 (= 16)
+MAX_VOLUNTARY_EXITS: 16
+
+
+# Signature domains
+# ---------------------------------------------------------------
+DOMAIN_BEACON_PROPOSER: 0x00000000
+DOMAIN_BEACON_ATTESTER: 0x01000000
+DOMAIN_RANDAO: 0x02000000
+DOMAIN_DEPOSIT: 0x03000000
+DOMAIN_VOLUNTARY_EXIT: 0x04000000
+DOMAIN_SELECTION_PROOF: 0x05000000
+DOMAIN_AGGREGATE_AND_PROOF: 0x06000000
diff --git a/common/eth2_testnet_config/built_in_testnet_configs/pyrmont/deploy_block.txt b/common/eth2_testnet_config/built_in_testnet_configs/pyrmont/deploy_block.txt
new file mode 100644
index 000000000..29d19b8ee
--- /dev/null
+++ b/common/eth2_testnet_config/built_in_testnet_configs/pyrmont/deploy_block.txt
@@ -0,0 +1 @@
+3743587
diff --git a/common/eth2_testnet_config/built_in_testnet_configs/pyrmont/deposit_contract.txt b/common/eth2_testnet_config/built_in_testnet_configs/pyrmont/deposit_contract.txt
new file mode 100644
index 000000000..1b64d3280
--- /dev/null
+++ b/common/eth2_testnet_config/built_in_testnet_configs/pyrmont/deposit_contract.txt
@@ -0,0 +1 @@
+0x8c5fecdC472E27Bc447696F431E425D02dd46a8c
diff --git a/common/eth2_testnet_config/built_in_testnet_configs/pyrmont/genesis.ssz.zip b/common/eth2_testnet_config/built_in_testnet_configs/pyrmont/genesis.ssz.zip
new file mode 100644
index 000000000..3b76c021a
Binary files /dev/null and b/common/eth2_testnet_config/built_in_testnet_configs/pyrmont/genesis.ssz.zip differ
diff --git a/common/eth2_testnet_config/built_in_testnet_configs/zinken/boot_enr.yaml b/common/eth2_testnet_config/built_in_testnet_configs/zinken/boot_enr.yaml
deleted file mode 100644
index f29496ed6..000000000
--- a/common/eth2_testnet_config/built_in_testnet_configs/zinken/boot_enr.yaml
+++ /dev/null
@@ -1,4 +0,0 @@
-- enr:-KG4QHPtVnKHEOkEJT1f5C6Hs-C_c4SlipTfkPrDIikLTzhqA_3m6bTq-CirsljlVP4IJybXelHE7J3l9DojR14_ZHUGhGV0aDKQ2jUIggAAAAP__________4JpZIJ2NIJpcIQSv2qciXNlY3AyNTZrMaECi_CNPDkKPilhimY7aEY-mBtSzI8AKMDvvv_I2Un74_qDdGNwgiMog3VkcIIjKA
-- enr:-Ku4QH63huZ12miIY0kLI9dunG5fwKpnn-zR3XyA_kH6rQpRD1VoyLyzIcFysCJ09JDprdX-EzXp-Nc8swYqBznkXggBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpDaNQiCAAAAA___________gmlkgnY0gmlwhBLf22SJc2VjcDI1NmsxoQILqxBY-_SF8o_5FjFD3yM92s50zT_ciFi8hStde5AEjIN1ZHCCH0A
-- enr:-Ku4QMGGAuQO8NPhYCz29wsahrFR-betfxKx6ltyzLUM70yJWoaRjJZ-n1Oiof2PiKnzjVG1n6RoyO4ZNJkQtqEkqNkBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpDaNQiCAAAAA___________gmlkgnY0gmlwhDZUyU6Jc2VjcDI1NmsxoQNMOowBnXeUYjK71_Zz78j3y7EYKSXH9ZGhYB4wB6V8lIN1ZHCCIyg
-- enr:-KG4QDCt7b_zpzEoKEATUYgvdfBy28DCtGs54E4U_IIKd5e1Pj71nUAJKqdNjjqH5L8wNVsGNI67dzX5_ATfVMHQ7ygChGV0aDKQufleewAAAAP__________4JpZIJ2NIJpcIQ0ECjWiXNlY3AyNTZrMaEC64bJmIc-R6ynv5PqUqMBjblHILK46WWi4bbXO9DAGbeDdGNwgiMog3VkcIIjKA
diff --git a/common/eth2_testnet_config/built_in_testnet_configs/zinken/config.yaml b/common/eth2_testnet_config/built_in_testnet_configs/zinken/config.yaml
deleted file mode 100644
index d5231127a..000000000
--- a/common/eth2_testnet_config/built_in_testnet_configs/zinken/config.yaml
+++ /dev/null
@@ -1,60 +0,0 @@
-CONFIG_NAME: "zinken"
-MAX_COMMITTEES_PER_SLOT: 64
-TARGET_COMMITTEE_SIZE: 128
-MAX_VALIDATORS_PER_COMMITTEE: 2048
-MIN_PER_EPOCH_CHURN_LIMIT: 4
-CHURN_LIMIT_QUOTIENT: 65536
-SHUFFLE_ROUND_COUNT: 90
-MIN_GENESIS_ACTIVE_VALIDATOR_COUNT: 1024
-MIN_GENESIS_TIME: 1602504000
-HYSTERESIS_QUOTIENT: 4
-HYSTERESIS_DOWNWARD_MULTIPLIER: 1
-HYSTERESIS_UPWARD_MULTIPLIER: 5
-PROPORTIONAL_SLASHING_MULTIPLIER: 3
-SAFE_SLOTS_TO_UPDATE_JUSTIFIED: 8
-ETH1_FOLLOW_DISTANCE: 1024
-TARGET_AGGREGATORS_PER_COMMITTEE: 16
-RANDOM_SUBNETS_PER_VALIDATOR: 1
-EPOCHS_PER_RANDOM_SUBNET_SUBSCRIPTION: 256
-SECONDS_PER_ETH1_BLOCK: 14
-DEPOSIT_CHAIN_ID: 5
-DEPOSIT_NETWORK_ID: 5
-DEPOSIT_CONTRACT_ADDRESS: 0x99F0Ec06548b086E46Cb0019C78D0b9b9F36cD53
-MIN_DEPOSIT_AMOUNT: 1000000000
-MAX_EFFECTIVE_BALANCE: 32000000000
-EJECTION_BALANCE: 16000000000
-EFFECTIVE_BALANCE_INCREMENT: 1000000000
-GENESIS_FORK_VERSION: 0x00000003
-BLS_WITHDRAWAL_PREFIX: 0x00
-GENESIS_DELAY: 345600
-SECONDS_PER_SLOT: 12
-MIN_ATTESTATION_INCLUSION_DELAY: 1
-SLOTS_PER_EPOCH: 32
-MIN_SEED_LOOKAHEAD: 1
-MAX_SEED_LOOKAHEAD: 4
-EPOCHS_PER_ETH1_VOTING_PERIOD: 32
-SLOTS_PER_HISTORICAL_ROOT: 8192
-MIN_VALIDATOR_WITHDRAWABILITY_DELAY: 256
-SHARD_COMMITTEE_PERIOD: 256
-MIN_EPOCHS_TO_INACTIVITY_PENALTY: 4
-EPOCHS_PER_HISTORICAL_VECTOR: 65536
-EPOCHS_PER_SLASHINGS_VECTOR: 8192
-HISTORICAL_ROOTS_LIMIT: 16777216
-VALIDATOR_REGISTRY_LIMIT: 1099511627776
-BASE_REWARD_FACTOR: 64
-WHISTLEBLOWER_REWARD_QUOTIENT: 512
-PROPOSER_REWARD_QUOTIENT: 8
-INACTIVITY_PENALTY_QUOTIENT: 16777216
-MIN_SLASHING_PENALTY_QUOTIENT: 32
-MAX_PROPOSER_SLASHINGS: 16
-MAX_ATTESTER_SLASHINGS: 2
-MAX_ATTESTATIONS: 128
-MAX_DEPOSITS: 16
-MAX_VOLUNTARY_EXITS: 16
-DOMAIN_BEACON_PROPOSER: 0x00000000
-DOMAIN_BEACON_ATTESTER: 0x01000000
-DOMAIN_RANDAO: 0x02000000
-DOMAIN_DEPOSIT: 0x03000000
-DOMAIN_VOLUNTARY_EXIT: 0x04000000
-DOMAIN_SELECTION_PROOF: 0x05000000
-DOMAIN_AGGREGATE_AND_PROOF: 0x06000000
diff --git a/common/eth2_testnet_config/built_in_testnet_configs/zinken/deploy_block.txt b/common/eth2_testnet_config/built_in_testnet_configs/zinken/deploy_block.txt
deleted file mode 100644
index 6b0325b6f..000000000
--- a/common/eth2_testnet_config/built_in_testnet_configs/zinken/deploy_block.txt
+++ /dev/null
@@ -1 +0,0 @@
-3488417
diff --git a/common/eth2_testnet_config/built_in_testnet_configs/zinken/deposit_contract.txt b/common/eth2_testnet_config/built_in_testnet_configs/zinken/deposit_contract.txt
deleted file mode 100644
index 67b5d86b2..000000000
--- a/common/eth2_testnet_config/built_in_testnet_configs/zinken/deposit_contract.txt
+++ /dev/null
@@ -1 +0,0 @@
-0x99F0Ec06548b086E46Cb0019C78D0b9b9F36cD53
diff --git a/common/eth2_testnet_config/built_in_testnet_configs/zinken/genesis.ssz.zip b/common/eth2_testnet_config/built_in_testnet_configs/zinken/genesis.ssz.zip
deleted file mode 100644
index c0c8c69e5..000000000
Binary files a/common/eth2_testnet_config/built_in_testnet_configs/zinken/genesis.ssz.zip and /dev/null differ
diff --git a/common/eth2_testnet_config/src/lib.rs b/common/eth2_testnet_config/src/lib.rs
index f644c2601..8538185a2 100644
--- a/common/eth2_testnet_config/src/lib.rs
+++ b/common/eth2_testnet_config/src/lib.rs
@@ -52,11 +52,11 @@ macro_rules! define_net {
 const ALTONA: HardcodedNet = define_net!(altona, include_altona_file);
 const MEDALLA: HardcodedNet = define_net!(medalla, include_medalla_file);
 const SPADINA: HardcodedNet = define_net!(spadina, include_spadina_file);
-const ZINKEN: HardcodedNet = define_net!(zinken, include_zinken_file);
+const PYRMONT: HardcodedNet = define_net!(pyrmont, include_pyrmont_file);
 const MAINNET: HardcodedNet = define_net!(mainnet, include_mainnet_file);
 const TOLEDO: HardcodedNet = define_net!(toledo, include_toledo_file);
 
-const HARDCODED_NETS: &[HardcodedNet] = &[ALTONA, MEDALLA, SPADINA, ZINKEN, MAINNET, TOLEDO];
+const HARDCODED_NETS: &[HardcodedNet] = &[ALTONA, MEDALLA, SPADINA, PYRMONT, MAINNET, TOLEDO];
 pub const DEFAULT_HARDCODED_TESTNET: &str = "medalla";
 
 /// Specifies an Eth2 testnet.
@@ -281,7 +281,7 @@ mod tests {
             let config =
                 Eth2TestnetConfig::from_hardcoded_net(net).expect(&format!("{:?}", net.name));
 
-            if net.name == "mainnet" || net.name == "toledo" {
+            if net.name == "mainnet" || net.name == "toledo" || net.name == "pyrmont" {
                 // Ensure we can parse the YAML config to a chain spec.
                 config
                     .yaml_config
diff --git a/consensus/types/src/chain_spec.rs b/consensus/types/src/chain_spec.rs
index d42b71b5a..93b196fa4 100644
--- a/consensus/types/src/chain_spec.rs
+++ b/consensus/types/src/chain_spec.rs
@@ -379,7 +379,7 @@ impl ChainSpec {
     /// https://github.com/ethereum/eth2.0-specs/blob/v0.12.3/configs/mainnet/phase0.yaml
     ///
     /// This method only needs to exist whilst we provide support for "legacy" testnets prior to v1.0.0
-    /// (e.g., Medalla, Zinken, Spadina, Altona, etc.).
+    /// (e.g., Medalla, Pyrmont, Spadina, Altona, etc.).
     pub fn v012_legacy() -> Self {
         let boot_nodes = vec![];
 
@@ -603,7 +603,7 @@ impl YamlConfig {
             "mainnet" => EthSpecId::Mainnet,
             "minimal" => EthSpecId::Minimal,
             "toledo" => EthSpecId::Mainnet,
-            "zinken" => EthSpecId::V012Legacy,
+            "pyrmont" => EthSpecId::Mainnet,
             "spadina" => EthSpecId::V012Legacy,
             "medalla" => EthSpecId::V012Legacy,
             "altona" => EthSpecId::V012Legacy,
diff --git a/consensus/types/src/eth_spec.rs b/consensus/types/src/eth_spec.rs
index 43b644320..9eeee557f 100644
--- a/consensus/types/src/eth_spec.rs
+++ b/consensus/types/src/eth_spec.rs
@@ -264,7 +264,7 @@ pub type MinimalBeaconState = BeaconState<MinimalEthSpec>;
 /// https://github.com/ethereum/eth2.0-specs/blob/v0.12.3/configs/mainnet/phase0.yaml
 ///
 /// This struct only needs to exist whilst we provide support for "legacy" testnets prior to v1.0.0
-/// (e.g., Medalla, Zinken, Spadina, Altona, etc.).
+/// (e.g., Medalla, Pyrmont, Spadina, Altona, etc.).
 #[cfg_attr(feature = "arbitrary-fuzz", derive(arbitrary::Arbitrary))]
 #[derive(Clone, PartialEq, Eq, Debug, Default, Serialize, Deserialize)]
 pub struct V012LegacyEthSpec;
diff --git a/lighthouse/src/main.rs b/lighthouse/src/main.rs
index 150aafd49..c2f43c88f 100644
--- a/lighthouse/src/main.rs
+++ b/lighthouse/src/main.rs
@@ -115,7 +115,7 @@ fn main() {
                 .long("testnet")
                 .value_name("testnet")
                 .help("Name of network lighthouse will connect to")
-                .possible_values(&["medalla", "altona", "spadina", "zinken", "mainnet", "toledo"])
+                .possible_values(&["medalla", "altona", "spadina", "pyrmont", "mainnet", "toledo"])
                 .conflicts_with("testnet-dir")
                 .takes_value(true)
                 .global(true)