diff --git a/dc/s2n-quic-dc/Cargo.toml b/dc/s2n-quic-dc/Cargo.toml
index 8c69596b7..74a0eee45 100644
--- a/dc/s2n-quic-dc/Cargo.toml
+++ b/dc/s2n-quic-dc/Cargo.toml
@@ -21,13 +21,13 @@ bolero-generator = { version = "0.11", optional = true }
 bytes = "1"
 crossbeam-channel = "0.5"
 crossbeam-queue = { version = "0.3" }
-generational-arena = { version = "0.2" }
 libc = "0.2"
 num-rational = { version = "0.4", default-features = false }
 once_cell = "1"
 s2n-codec = { version = "=0.38.1", path = "../../common/s2n-codec", default-features = false }
 s2n-quic-core = { version = "=0.38.1", path = "../../quic/s2n-quic-core", default-features = false }
 s2n-quic-platform = { version = "=0.38.1", path = "../../quic/s2n-quic-platform" }
+slotmap = "1"
 thiserror = "1"
 tokio = { version = "1", features = ["io-util"], optional = true }
 tracing = "0.1"
diff --git a/dc/s2n-quic-dc/src/stream/send/worker.rs b/dc/s2n-quic-dc/src/stream/send/worker.rs
index f1033d848..80213b493 100644
--- a/dc/s2n-quic-dc/src/stream/send/worker.rs
+++ b/dc/s2n-quic-dc/src/stream/send/worker.rs
@@ -19,7 +19,6 @@ use crate::{
     },
 };
 use core::{task::Poll, time::Duration};
-use generational_arena::{Arena, Index as BufferIndex};
 use s2n_codec::{DecoderBufferMut, EncoderBuffer};
 use s2n_quic_core::{
     ensure,
@@ -37,6 +36,7 @@ use s2n_quic_core::{
     },
     varint::VarInt,
 };
+use slotmap::SlotMap;
 use std::collections::{BinaryHeap, VecDeque};
 use tracing::{debug, trace};
 
@@ -48,6 +48,10 @@ type PacketMap<Info> = s2n_quic_core::packet::number::Map<Info>;
 
 pub type Transmission = application::transmission::Event<buffer::Segment>;
 
+slotmap::new_key_type! {
+    pub struct BufferIndex;
+}
+
 #[derive(Clone, Copy, Debug)]
 pub enum TransmitIndex {
     Stream(BufferIndex),
@@ -72,10 +76,10 @@ pub struct Worker {
     pub stream_id: stream::Id,
     pub rtt_estimator: RttEstimator,
     pub sent_stream_packets: PacketMap<SentStreamPacket>,
-    pub stream_packet_buffers: Arena<buffer::Segment>,
+    pub stream_packet_buffers: SlotMap<BufferIndex, buffer::Segment>,
     pub max_stream_packet_number: VarInt,
     pub sent_recovery_packets: PacketMap<SentRecoveryPacket>,
-    pub recovery_packet_buffers: Arena<Vec<u8>>,
+    pub recovery_packet_buffers: SlotMap<BufferIndex, Vec<u8>>,
     pub free_packet_buffers: Vec<Vec<u8>>,
     pub recovery_packet_number: u64,
     pub last_sent_recovery_packet: Option<Timestamp>,