diff --git a/configs/mainnet/altair.yaml b/configs/mainnet/altair.yaml
index 1bebafe90..1e82d31ff 100644
--- a/configs/mainnet/altair.yaml
+++ b/configs/mainnet/altair.yaml
@@ -31,6 +31,8 @@ EPOCHS_PER_SYNC_COMMITTEE_PERIOD: 256
 # Signature domains
 # ---------------------------------------------------------------
 DOMAIN_SYNC_COMMITTEE: 0x07000000
+DOMAIN_SYNC_COMMITTEE_SELECTION_PROOF: 0x08000000
+DOMAIN_CONTRIBUTION_AND_PROOF: 0x09000000
 
 
 # Fork
diff --git a/configs/minimal/altair.yaml b/configs/minimal/altair.yaml
index f10e10bb9..26333fc72 100644
--- a/configs/minimal/altair.yaml
+++ b/configs/minimal/altair.yaml
@@ -31,6 +31,8 @@ EPOCHS_PER_SYNC_COMMITTEE_PERIOD: 8
 # Signature domains
 # ---------------------------------------------------------------
 DOMAIN_SYNC_COMMITTEE: 0x07000000
+DOMAIN_SYNC_COMMITTEE_SELECTION_PROOF: 0x08000000
+DOMAIN_CONTRIBUTION_AND_PROOF: 0x09000000
 
 
 # Fork