diff --git a/eth2/types/src/attestation.rs b/eth2/types/src/attestation.rs
index 4b3c2e89c..0b660466e 100644
--- a/eth2/types/src/attestation.rs
+++ b/eth2/types/src/attestation.rs
@@ -8,7 +8,7 @@ use test_random_derive::TestRandom;
 
 /// Details an attestation that can be slashable.
 ///
-/// Spec v0.4.0
+/// Spec v0.5.0
 #[derive(
     Debug,
     Clone,
diff --git a/eth2/types/src/attester_slashing.rs b/eth2/types/src/attester_slashing.rs
index 195c0fdcc..6fc404f42 100644
--- a/eth2/types/src/attester_slashing.rs
+++ b/eth2/types/src/attester_slashing.rs
@@ -6,7 +6,7 @@ use test_random_derive::TestRandom;
 
 /// Two conflicting attestations.
 ///
-/// Spec v0.4.0
+/// Spec v0.5.0
 #[derive(Debug, PartialEq, Clone, Serialize, Deserialize, Encode, Decode, TreeHash, TestRandom)]
 pub struct AttesterSlashing {
     pub slashable_attestation_1: SlashableAttestation,