diff --git a/src/packets/mod.rs b/src/packets/mod.rs
index e57241b..c4b5ffa 100644
--- a/src/packets/mod.rs
+++ b/src/packets/mod.rs
@@ -37,7 +37,7 @@ use crate::packets::session::{
     MAX_NUM_MARSHAL_ZONES, MAX_NUM_SESSIONS,
 };
 use crate::packets::session_history::{
-    LapHistoryData, TyreStintHistoryData, LAP_HISTORY_RAW_SIZE, MAX_NUM_LAPS,
+    get_lap_history_raw_size, LapHistoryData, TyreStintHistoryData, MAX_NUM_LAPS,
     MAX_NUM_TYRE_STINTS,
 };
 use crate::packets::time_trial::TimeTrialDataSet;
@@ -335,6 +335,7 @@ pub struct F1PacketSession {
     /// Number of sessions in the ongoing race weekend.
     #[br(
         map(u8_to_usize),
+        if(packet_format >= 2024),
         assert(
             num_sessions_in_weekend <= MAX_NUM_SESSIONS,
             "Session packet has an invalid number of sessions in a weekend: {}",
@@ -574,7 +575,7 @@ pub struct F1PacketSessionHistory {
     #[br(
         count(num_laps),
         args{ inner: (packet_format,) },
-        pad_after((MAX_NUM_LAPS - num_laps) * LAP_HISTORY_RAW_SIZE)
+        pad_after((MAX_NUM_LAPS - num_laps) * get_lap_history_raw_size(packet_format))
     )]
     pub lap_history_data: Vec<LapHistoryData>,
     /// Tyre stint history.
diff --git a/src/packets/session_history.rs b/src/packets/session_history.rs
index 26735c1..2c08576 100644
--- a/src/packets/session_history.rs
+++ b/src/packets/session_history.rs
@@ -5,7 +5,6 @@ use binrw::BinRead;
 use serde::{Deserialize, Serialize};
 
 pub(super) const MAX_NUM_LAPS: usize = 100;
-pub(super) const LAP_HISTORY_RAW_SIZE: usize = 14;
 pub(super) const MAX_NUM_TYRE_STINTS: usize = 8;
 
 #[non_exhaustive]
@@ -53,3 +52,12 @@ pub struct TyreStintHistoryData {
     /// Visual tyre compound used.
     pub visual_tyre_compound: VisualTyreCompound,
 }
+
+#[inline(always)]
+pub(super) fn get_lap_history_raw_size(packet_format: u16) -> usize {
+    if packet_format >= 2023 {
+        14
+    } else {
+        11
+    }
+}