diff --git a/ethereum-consensus/src/electra/presets/mainnet.rs b/ethereum-consensus/src/electra/presets/mainnet.rs
index 3a0061c0c..e3ede4d56 100644
--- a/ethereum-consensus/src/electra/presets/mainnet.rs
+++ b/ethereum-consensus/src/electra/presets/mainnet.rs
@@ -1,5 +1,8 @@
 pub use crate::electra::presets::Preset;
-use crate::electra::spec;
+use crate::{
+    electra::spec,
+    phase0::mainnet::{MAX_COMMITTEES_PER_SLOT, MAX_VALIDATORS_PER_COMMITTEE},
+};
 
 pub use spec::*;
 
@@ -32,3 +35,9 @@ pub const PRESET: Preset = Preset {
     max_withdrawal_requests_per_payload: MAX_WITHDRAWAL_REQUESTS_PER_PAYLOAD,
     max_pending_partials_per_withdrawals_sweep: MAX_PENDING_PARTIALS_PER_WITHDRAWALS_SWEEP,
 };
+
+const MAX_VALIDATORS_PER_SLOT: usize =
+    MAX_COMMITTEES_PER_SLOT as usize * MAX_VALIDATORS_PER_COMMITTEE;
+
+pub type Attestation =
+    spec::Attestation<MAX_VALIDATORS_PER_SLOT, { MAX_COMMITTEES_PER_SLOT as usize }>;
diff --git a/ethereum-consensus/src/electra/presets/minimal.rs b/ethereum-consensus/src/electra/presets/minimal.rs
index 690cb99b5..bf6574c95 100644
--- a/ethereum-consensus/src/electra/presets/minimal.rs
+++ b/ethereum-consensus/src/electra/presets/minimal.rs
@@ -1,5 +1,8 @@
 pub use crate::electra::presets::Preset;
-use crate::electra::spec;
+use crate::{
+    electra::spec,
+    phase0::minimal::{MAX_COMMITTEES_PER_SLOT, MAX_VALIDATORS_PER_COMMITTEE},
+};
 
 pub use spec::*;
 
@@ -32,3 +35,9 @@ pub const PRESET: Preset = Preset {
     max_withdrawal_requests_per_payload: MAX_WITHDRAWAL_REQUESTS_PER_PAYLOAD,
     max_pending_partials_per_withdrawals_sweep: MAX_PENDING_PARTIALS_PER_WITHDRAWALS_SWEEP,
 };
+
+const MAX_VALIDATORS_PER_SLOT: usize =
+    MAX_COMMITTEES_PER_SLOT as usize * MAX_VALIDATORS_PER_COMMITTEE;
+
+pub type Attestation =
+    spec::Attestation<MAX_VALIDATORS_PER_SLOT, { MAX_COMMITTEES_PER_SLOT as usize }>;
diff --git a/spec-tests/runners/ssz_static.rs b/spec-tests/runners/ssz_static.rs
index 7f6fb71b0..0829ce63e 100644
--- a/spec-tests/runners/ssz_static.rs
+++ b/spec-tests/runners/ssz_static.rs
@@ -35,6 +35,31 @@ fn run_test<T: ssz_rs::SimpleSerialize>(
     Ok(())
 }
 
+macro_rules! gen_electra {
+    ($test_case:expr, $($handler:ident),*) => {
+        let result = match $test_case.meta.handler.0.as_str() {
+            $(
+                stringify!($handler) => gen_match_for! {
+                    $test_case,
+                    (mainnet, electra),
+                    (minimal, electra)
+                    {
+                        gen_exec! {
+                            $test_case, load_test, run_test::<spec::$handler>
+                        }
+                    }
+                },
+            )*
+            _ => Err(Error::InternalContinue),
+        };
+        match result {
+            Ok(()) => return Ok(()),
+            Err(Error::InternalContinue) => {},
+            Err(err) => return Err(err)
+        }
+    };
+}
+
 macro_rules! gen_deneb_and_later {
     ($test_case:expr, $($handler:ident),*) => {
         let result = match $test_case.meta.handler.0.as_str() {
@@ -165,6 +190,11 @@ macro_rules! gen_match {
 }
 
 pub fn dispatch(test: &TestCase) -> Result<(), Error> {
+    gen_electra! {
+        test,
+        Attestation
+    }
+
     gen_deneb_and_later! {
         test,
         BlobSidecar,
diff --git a/spec-tests/spec-test-version b/spec-tests/spec-test-version
index 0d0c52f84..8c0ee2b55 100644
--- a/spec-tests/spec-test-version
+++ b/spec-tests/spec-test-version
@@ -1 +1 @@
-v1.4.0
+v1.5.0-alpha.0
diff --git a/spec-tests/test_meta.rs b/spec-tests/test_meta.rs
index 4c2341f65..6ee8cda01 100644
--- a/spec-tests/test_meta.rs
+++ b/spec-tests/test_meta.rs
@@ -33,6 +33,7 @@ pub enum Fork {
     Bellatrix,
     Capella,
     Deneb,
+    Electra,
     Eip6110,
     Whisk,
 }
@@ -45,6 +46,7 @@ impl From<&str> for Fork {
             "bellatrix" => Self::Bellatrix,
             "capella" => Self::Capella,
             "deneb" => Self::Deneb,
+            "electra" => Self::Electra,
             "eip6110" => Self::Eip6110,
             "whisk" => Self::Whisk,
             fork => panic!("unsupported fork: {fork:?}"),