diff --git a/Cargo.toml b/Cargo.toml
index c73e9f22d..a473e0391 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,7 +3,6 @@ members = [
 	"eth2/attestation_validation",
 	"eth2/genesis",
 	"eth2/naive_fork_choice",
-	"eth2/spec",
 	"eth2/types",
 	"eth2/utils/bls",
 	"eth2/utils/boolean-bitfield",
diff --git a/beacon_node/src/beacon_chain/mod.rs b/beacon_node/src/beacon_chain/mod.rs
index 2a3d41538..09dec741c 100644
--- a/beacon_node/src/beacon_chain/mod.rs
+++ b/beacon_node/src/beacon_chain/mod.rs
@@ -7,11 +7,10 @@ use db::{
 };
 use genesis::{genesis_beacon_block, genesis_beacon_state, GenesisError};
 use slot_clock::SlotClock;
-use spec::ChainSpec;
 use ssz::ssz_encode;
 use std::collections::HashSet;
 use std::sync::Arc;
-use types::Hash256;
+use types::{ChainSpec, Hash256};
 
 pub use crate::block_processing::Outcome as BlockProcessingOutcome;
 
diff --git a/beacon_node/src/beacon_chain/tests/chain_test.rs b/beacon_node/src/beacon_chain/tests/chain_test.rs
index 8d2cfa501..fe7dfcf6c 100644
--- a/beacon_node/src/beacon_chain/tests/chain_test.rs
+++ b/beacon_node/src/beacon_chain/tests/chain_test.rs
@@ -4,8 +4,8 @@ use db::{
     MemoryDB,
 };
 use slot_clock::TestingSlotClock;
-use spec::ChainSpec;
 use std::sync::Arc;
+use types::ChainSpec;
 
 fn in_memory_test_stores() -> (
     Arc<MemoryDB>,
diff --git a/eth2/genesis/Cargo.toml b/eth2/genesis/Cargo.toml
index 499333979..d56b3f929 100644
--- a/eth2/genesis/Cargo.toml
+++ b/eth2/genesis/Cargo.toml
@@ -6,7 +6,6 @@ edition = "2018"
 
 [dependencies]
 bls = { path = "../utils/bls"  }
-spec = { path = "../spec"  }
 ssz = { path = "../utils/ssz" }
 types = { path = "../types"  }
 validator_induction = { path = "../validator_induction"  }
diff --git a/eth2/genesis/src/beacon_block.rs b/eth2/genesis/src/beacon_block.rs
index e79e3d2f4..debc2bd2b 100644
--- a/eth2/genesis/src/beacon_block.rs
+++ b/eth2/genesis/src/beacon_block.rs
@@ -1,5 +1,4 @@
-use spec::ChainSpec;
-use types::{BeaconBlock, BeaconBlockBody, Eth1Data, Hash256};
+use types::{BeaconBlock, BeaconBlockBody, ChainSpec, Eth1Data, Hash256};
 
 /// Generate a genesis BeaconBlock.
 pub fn genesis_beacon_block(state_root: Hash256, spec: &ChainSpec) -> BeaconBlock {
diff --git a/eth2/genesis/src/beacon_state.rs b/eth2/genesis/src/beacon_state.rs
index 7644e782b..788af7c82 100644
--- a/eth2/genesis/src/beacon_state.rs
+++ b/eth2/genesis/src/beacon_state.rs
@@ -1,5 +1,4 @@
-use spec::ChainSpec;
-use types::{BeaconState, Crosslink, Fork};
+use types::{BeaconState, ChainSpec, Crosslink, Fork};
 use validator_shuffling::{shard_and_committees_for_cycle, ValidatorAssignmentError};
 
 #[derive(Debug, PartialEq)]
diff --git a/eth2/genesis/src/lib.rs b/eth2/genesis/src/lib.rs
index 6f45863aa..003e66959 100644
--- a/eth2/genesis/src/lib.rs
+++ b/eth2/genesis/src/lib.rs
@@ -1,8 +1,3 @@
-extern crate spec;
-extern crate types;
-extern crate validator_induction;
-extern crate validator_shuffling;
-
 mod beacon_block;
 mod beacon_state;
 
diff --git a/eth2/spec/Cargo.toml b/eth2/spec/Cargo.toml
deleted file mode 100644
index 5c535ab41..000000000
--- a/eth2/spec/Cargo.toml
+++ /dev/null
@@ -1,9 +0,0 @@
-[package]
-name = "spec"
-version = "0.1.0"
-authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
-
-[dependencies]
-bls = { path = "../utils/bls"  }
-types = { path = "../types" }
diff --git a/eth2/types/src/lib.rs b/eth2/types/src/lib.rs
index 6c4a1b977..1018e38af 100644
--- a/eth2/types/src/lib.rs
+++ b/eth2/types/src/lib.rs
@@ -25,6 +25,7 @@ pub mod proposer_slashing;
 pub mod shard_committee;
 pub mod shard_reassignment_record;
 pub mod slashable_vote_data;
+pub mod spec;
 pub mod special_record;
 pub mod validator;
 pub mod validator_registry;
@@ -54,6 +55,7 @@ pub use crate::proposal_signed_data::ProposalSignedData;
 pub use crate::proposer_slashing::ProposerSlashing;
 pub use crate::shard_committee::ShardCommittee;
 pub use crate::slashable_vote_data::SlashableVoteData;
+pub use crate::spec::ChainSpec;
 pub use crate::special_record::{SpecialRecord, SpecialRecordKind};
 pub use crate::validator::{StatusFlags as ValidatorStatusFlags, Validator};
 pub use crate::validator_registry_delta_block::ValidatorRegistryDeltaBlock;
diff --git a/eth2/spec/src/foundation.rs b/eth2/types/src/spec/foundation.rs
similarity index 98%
rename from eth2/spec/src/foundation.rs
rename to eth2/types/src/spec/foundation.rs
index 8508a74e1..f24a55b2a 100644
--- a/eth2/spec/src/foundation.rs
+++ b/eth2/types/src/spec/foundation.rs
@@ -1,7 +1,7 @@
 use super::ChainSpec;
 use bls::{Keypair, PublicKey, SecretKey, Signature};
 
-use types::{Address, Eth1Data, Hash256, Validator};
+use crate::{Address, Eth1Data, Hash256, Validator};
 
 /// The size of a validators deposit in GWei.
 pub const DEPOSIT_GWEI: u64 = 32_000_000_000;
diff --git a/eth2/spec/src/lib.rs b/eth2/types/src/spec/mod.rs
similarity index 95%
rename from eth2/spec/src/lib.rs
rename to eth2/types/src/spec/mod.rs
index 3e7d5dd2b..1bf5b3d50 100644
--- a/eth2/spec/src/lib.rs
+++ b/eth2/types/src/spec/mod.rs
@@ -1,10 +1,7 @@
-extern crate bls;
-extern crate types;
-
 mod foundation;
 
+use crate::{Address, Eth1Data, Hash256, Validator};
 use bls::Signature;
-use types::{Address, Eth1Data, Hash256, Validator};
 
 #[derive(PartialEq, Debug)]
 pub struct ChainSpec {
diff --git a/eth2/validator_induction/Cargo.toml b/eth2/validator_induction/Cargo.toml
index 3530bbbf1..5907014df 100644
--- a/eth2/validator_induction/Cargo.toml
+++ b/eth2/validator_induction/Cargo.toml
@@ -8,4 +8,3 @@ edition = "2018"
 bls = { path = "../utils/bls" }
 hashing = { path = "../utils/hashing" }
 types = { path = "../types" }
-spec = { path = "../spec" }
diff --git a/eth2/validator_induction/src/inductor.rs b/eth2/validator_induction/src/inductor.rs
index 6efc9af2e..6b3cfdf16 100644
--- a/eth2/validator_induction/src/inductor.rs
+++ b/eth2/validator_induction/src/inductor.rs
@@ -1,6 +1,5 @@
 use bls::verify_proof_of_possession;
-use spec::ChainSpec;
-use types::{BeaconState, Deposit, Validator};
+use types::{BeaconState, ChainSpec, Deposit, Validator};
 
 #[derive(Debug, PartialEq, Clone)]
 pub enum ValidatorInductionError {
diff --git a/eth2/validator_induction/src/lib.rs b/eth2/validator_induction/src/lib.rs
index 7119d6c2e..3a4fa9a14 100644
--- a/eth2/validator_induction/src/lib.rs
+++ b/eth2/validator_induction/src/lib.rs
@@ -1,8 +1,3 @@
-extern crate bls;
-extern crate hashing;
-extern crate spec;
-extern crate types;
-
 mod inductor;
 
 pub use crate::inductor::{process_deposit, ValidatorInductionError};
diff --git a/eth2/validator_shuffling/Cargo.toml b/eth2/validator_shuffling/Cargo.toml
index 99a97c5ec..ae2babf1a 100644
--- a/eth2/validator_shuffling/Cargo.toml
+++ b/eth2/validator_shuffling/Cargo.toml
@@ -6,6 +6,5 @@ edition = "2018"
 
 [dependencies]
 honey-badger-split = { path = "../utils/honey-badger-split" }
-spec = { path = "../spec" }
 types = { path = "../types" }
 vec_shuffle = { path = "../utils/vec_shuffle" }
diff --git a/eth2/validator_shuffling/src/lib.rs b/eth2/validator_shuffling/src/lib.rs
index ee59ffecc..2307dd301 100644
--- a/eth2/validator_shuffling/src/lib.rs
+++ b/eth2/validator_shuffling/src/lib.rs
@@ -1,8 +1,3 @@
-extern crate honey_badger_split;
-extern crate spec;
-extern crate types;
-extern crate vec_shuffle;
-
 mod shuffle;
 
 pub use crate::shuffle::{shard_and_committees_for_cycle, ValidatorAssignmentError};
diff --git a/eth2/validator_shuffling/src/shuffle.rs b/eth2/validator_shuffling/src/shuffle.rs
index 734f5995c..ea2cba7f4 100644
--- a/eth2/validator_shuffling/src/shuffle.rs
+++ b/eth2/validator_shuffling/src/shuffle.rs
@@ -1,8 +1,7 @@
 use std::cmp::min;
 
 use honey_badger_split::SplitExt;
-use spec::ChainSpec;
-use types::validator_registry::get_active_validator_indices;
+use types::{validator_registry::get_active_validator_indices, ChainSpec};
 use types::{ShardCommittee, Validator};
 use vec_shuffle::{shuffle, ShuffleErr};
 
diff --git a/validator_client/Cargo.toml b/validator_client/Cargo.toml
index c23e6607a..dfec240c4 100644
--- a/validator_client/Cargo.toml
+++ b/validator_client/Cargo.toml
@@ -12,7 +12,6 @@ grpcio = { version = "0.4", default-features = false, features = ["protobuf-code
 protobuf = "2.0.2"
 protos = { path = "../protos" }
 slot_clock = { path = "../eth2/utils/slot_clock" }
-spec = { path = "../eth2/spec" }
 types = { path = "../eth2/types" }
 slog = "^2.2.3"
 slog-term = "^2.4.0"
diff --git a/validator_client/src/block_producer/mod.rs b/validator_client/src/block_producer/mod.rs
index f3cd0199b..e36d4ed80 100644
--- a/validator_client/src/block_producer/mod.rs
+++ b/validator_client/src/block_producer/mod.rs
@@ -7,9 +7,8 @@ mod traits;
 use self::traits::{BeaconNode, BeaconNodeError};
 use super::EpochDutiesMap;
 use slot_clock::SlotClock;
-use spec::ChainSpec;
 use std::sync::{Arc, RwLock};
-use types::BeaconBlock;
+use types::{BeaconBlock, ChainSpec};
 
 pub use self::service::BlockProducerService;
 
diff --git a/validator_client/src/duties/mod.rs b/validator_client/src/duties/mod.rs
index 4656715ba..851c2a033 100644
--- a/validator_client/src/duties/mod.rs
+++ b/validator_client/src/duties/mod.rs
@@ -7,9 +7,9 @@ mod traits;
 use self::traits::{BeaconNode, BeaconNodeError};
 use bls::PublicKey;
 use slot_clock::SlotClock;
-use spec::ChainSpec;
 use std::collections::HashMap;
 use std::sync::{Arc, RwLock};
+use types::ChainSpec;
 
 pub use self::service::DutiesManagerService;
 
diff --git a/validator_client/src/main.rs b/validator_client/src/main.rs
index bbbc0b4c3..56c705494 100644
--- a/validator_client/src/main.rs
+++ b/validator_client/src/main.rs
@@ -7,10 +7,10 @@ use grpcio::{ChannelBuilder, EnvBuilder};
 use protos::services_grpc::{BeaconBlockServiceClient, ValidatorServiceClient};
 use slog::{error, info, o, Drain};
 use slot_clock::SystemTimeSlotClock;
-use spec::ChainSpec;
 use std::path::PathBuf;
 use std::sync::{Arc, RwLock};
 use std::thread;
+use types::ChainSpec;
 
 mod block_producer;
 mod config;