diff --git a/go.mod b/go.mod
index fc6eb1e0..a1fc5bf1 100644
--- a/go.mod
+++ b/go.mod
@@ -21,3 +21,5 @@ require (
 	golang.org/x/sys v0.19.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
+
+replace github.com/pion/rtp => github.com/aler9/rtp v0.0.0-20240427184751-2502db909c7a
diff --git a/go.sum b/go.sum
index a5650d04..0c7a777c 100644
--- a/go.sum
+++ b/go.sum
@@ -1,3 +1,5 @@
+github.com/aler9/rtp v0.0.0-20240427184751-2502db909c7a h1:e78syd2gamX/4n7nT2tc1LpZjIZXTLYkZLO9cFePgKc=
+github.com/aler9/rtp v0.0.0-20240427184751-2502db909c7a/go.mod h1:pBGHaFt/yW7bf1jjWAoUjpSNoDnw98KTMg+jWWvziqU=
 github.com/asticode/go-astikit v0.30.0 h1:DkBkRQRIxYcknlaU7W7ksNfn4gMFsB0tqMJflxkRsZA=
 github.com/asticode/go-astikit v0.30.0/go.mod h1:h4ly7idim1tNhaVkdVBeXQZEE3L0xblP7fCWbgwipF0=
 github.com/asticode/go-astits v1.13.0 h1:XOgkaadfZODnyZRR5Y0/DWkA9vrkLLPLeeOvDwfKZ1c=
@@ -13,8 +15,6 @@ github.com/pion/randutil v0.1.0 h1:CFG1UdESneORglEsnimhUjf33Rwjubwj6xfiOXBa3mA=
 github.com/pion/randutil v0.1.0/go.mod h1:XcJrSMMbbMRhASFVOlj/5hQial/Y8oH/HVo7TBZq+j8=
 github.com/pion/rtcp v1.2.14 h1:KCkGV3vJ+4DAJmvP0vaQShsb0xkRfWkO540Gy102KyE=
 github.com/pion/rtcp v1.2.14/go.mod h1:sn6qjxvnwyAkkPzPULIbVqSKI5Dv54Rv7VG0kNxh9L4=
-github.com/pion/rtp v1.8.5 h1:uYzINfaK+9yWs7r537z/Rc1SvT8ILjBcmDOpJcTB+OU=
-github.com/pion/rtp v1.8.5/go.mod h1:pBGHaFt/yW7bf1jjWAoUjpSNoDnw98KTMg+jWWvziqU=
 github.com/pion/sdp/v3 v3.0.9 h1:pX++dCHoHUwq43kuwf3PyJfHlwIj4hXA7Vrifiq0IJY=
 github.com/pion/sdp/v3 v3.0.9/go.mod h1:B5xmvENq5IXJimIO4zfp6LAe1fD9N+kFv+V/1lOdz8M=
 github.com/pkg/profile v1.4.0/go.mod h1:NWz/XGvpEW1FyYQ7fCx4dqYBLlfTcE+A9FLAkNKqjFE=
diff --git a/pkg/format/rtpvp9/encoder_test.go b/pkg/format/rtpvp9/encoder_test.go
index 7910a7d0..6745b0e8 100644
--- a/pkg/format/rtpvp9/encoder_test.go
+++ b/pkg/format/rtpvp9/encoder_test.go
@@ -39,7 +39,7 @@ var cases = []struct {
 }{
 	{
 		"single",
-		[]byte{0x01, 0x02, 0x03, 0x04},
+		[]byte{0x82, 0x49, 0x83, 0x42, 0x0, 0x77, 0xf0, 0x32, 0x34},
 		[]*rtp.Packet{
 			{
 				Header: rtp.Header{
@@ -49,13 +49,20 @@ var cases = []struct {
 					SequenceNumber: 17645,
 					SSRC:           0x9dbb7812,
 				},
-				Payload: []byte{0x9c, 0xb5, 0xaf, 0x01, 0x02, 0x03, 0x04},
+				Payload: []byte{
+					0x8f, 0xb5, 0xaf, 0x18, 0x07, 0x80, 0x03, 0x24,
+					0x01, 0x14, 0x01, 0x82, 0x49, 0x83, 0x42, 0x00,
+					0x77, 0xf0, 0x32, 0x34,
+				},
 			},
 		},
 	},
 	{
 		"fragmented",
-		bytes.Repeat([]byte{0x01, 0x02, 0x03, 0x04}, 4096/4),
+		mergeBytes(
+			[]byte{0x82, 0x49, 0x83, 0x42, 0x0, 0x77, 0xf0, 0x32, 0x34},
+			bytes.Repeat([]byte{1, 2, 3, 4}, 4096/4),
+		),
 		[]*rtp.Packet{
 			{
 				Header: rtp.Header{
@@ -65,7 +72,13 @@ var cases = []struct {
 					SequenceNumber: 17645,
 					SSRC:           0x9dbb7812,
 				},
-				Payload: mergeBytes([]byte{0x98, 0xb5, 0xaf}, bytes.Repeat([]byte{0x01, 0x02, 0x03, 0x04}, 364), []byte{0x01}),
+				Payload: mergeBytes(
+					[]byte{
+						0x8b, 0xb5, 0xaf, 0x18, 0x07, 0x80, 0x03, 0x24,
+						0x01, 0x14, 0x01, 0x82, 0x49, 0x83, 0x42, 0x00,
+						0x77, 0xf0, 0x32, 0x34,
+					},
+					bytes.Repeat([]byte{1, 2, 3, 4}, 360)),
 			},
 			{
 				Header: rtp.Header{
@@ -75,8 +88,9 @@ var cases = []struct {
 					SequenceNumber: 17646,
 					SSRC:           0x9dbb7812,
 				},
-				Payload: mergeBytes([]byte{0x90, 0xb5, 0xaf, 0x02, 0x03, 0x04},
-					bytes.Repeat([]byte{0x01, 0x02, 0x03, 0x04}, 363), []byte{0x01, 0x02}),
+				Payload: mergeBytes(
+					[]byte{0x81, 0xb5, 0xaf},
+					bytes.Repeat([]byte{1, 2, 3, 4}, 364), []byte{1}),
 			},
 			{
 				Header: rtp.Header{
@@ -86,7 +100,9 @@ var cases = []struct {
 					SequenceNumber: 17647,
 					SSRC:           0x9dbb7812,
 				},
-				Payload: mergeBytes([]byte{0x94, 0xb5, 0xaf, 0x03, 0x04}, bytes.Repeat([]byte{0x01, 0x02, 0x03, 0x04}, 295)),
+				Payload: mergeBytes(
+					[]byte{0x85, 0xb5, 0xaf, 2, 3, 4},
+					bytes.Repeat([]byte{1, 2, 3, 4}, 299)),
 			},
 		},
 	},
diff --git a/pkg/format/vp9_test.go b/pkg/format/vp9_test.go
index bbe988a8..46bcf66d 100644
--- a/pkg/format/vp9_test.go
+++ b/pkg/format/vp9_test.go
@@ -22,7 +22,7 @@ func TestVP9DecEncoder(t *testing.T) {
 	enc, err := format.CreateEncoder()
 	require.NoError(t, err)
 
-	pkts, err := enc.Encode([]byte{0x01, 0x02, 0x03, 0x04})
+	pkts, err := enc.Encode([]byte{0x82, 0x49, 0x83, 0x42, 0x0, 0x77, 0xf0, 0x32, 0x34})
 	require.NoError(t, err)
 	require.Equal(t, format.PayloadType(), pkts[0].PayloadType)
 
@@ -31,5 +31,5 @@ func TestVP9DecEncoder(t *testing.T) {
 
 	byts, err := dec.Decode(pkts[0])
 	require.NoError(t, err)
-	require.Equal(t, []byte{0x01, 0x02, 0x03, 0x04}, byts)
+	require.Equal(t, []byte{0x82, 0x49, 0x83, 0x42, 0x0, 0x77, 0xf0, 0x32, 0x34}, byts)
 }