diff --git a/runner/internal/shim/docker.go b/runner/internal/shim/docker.go
index 49a11c7e7..604cc8354 100644
--- a/runner/internal/shim/docker.go
+++ b/runner/internal/shim/docker.go
@@ -56,17 +56,26 @@ const (
 // https://github.com/moby/moby/blob/e77ff99ede5ee5952b3a9227863552ae6e5b6fb1/pkg/jsonmessage/jsonmessage.go#L144
 // All fields are optional.
 type PullMessage struct {
-	Id             string `json:"id"` // layer id
-	Status         string `json:"status"`
-	ProgressDetail struct {
-		Current uint64 `json:"current"` // bytes
-		Total   uint64 `json:"total"`   // bytes
-	} `json:"progressDetail"`
-	ErrorDetail struct {
+	Id             string         `json:"id"` // layer id
+	Status         string         `json:"status"`
+	ProgressDetail ProgressDetail `json:"progressDetail"`
+	ErrorDetail    struct {
 		Message string `json:"message"`
 	} `json:"errorDetail"`
 }
 
+type ProgressDetail struct {
+	Current uint64 `json:"current"`
+	Total   uint64 `json:"total"`
+	Units   string `json:"units"`
+}
+
+func (p *ProgressDetail) isUnitBytes() bool {
+	// > Units is the unit to print for progress. It defaults to "bytes" if empty
+	// https://github.com/moby/moby/blob/8151a55a776f5f83f68bcf0030c19031439ea357/api/types/jsonstream/progress.go#L9
+	return p.Units == "bytes" || p.Units == ""
+}
+
 type layerProgress struct {
 	Status          string
 	DownloadedBytes uint64
@@ -94,14 +103,18 @@ func (t *PullTracker) Update(msg PullMessage) {
 	case "Pulling fs layer", "Waiting", "Verifying Checksum", "Already exists":
 		// no bytes to update, just track status
 	case "Downloading":
-		layer.DownloadedBytes = msg.ProgressDetail.Current
-		layer.TotalBytes = msg.ProgressDetail.Total
+		if msg.ProgressDetail.isUnitBytes() {
+			layer.DownloadedBytes = msg.ProgressDetail.Current
+			layer.TotalBytes = msg.ProgressDetail.Total
+		}
 	case "Download complete":
 		layer.DownloadedBytes = layer.TotalBytes
 	case "Extracting":
-		layer.ExtractedBytes = msg.ProgressDetail.Current
-		layer.DownloadedBytes = msg.ProgressDetail.Total
-		layer.TotalBytes = msg.ProgressDetail.Total
+		if msg.ProgressDetail.isUnitBytes() {
+			layer.ExtractedBytes = msg.ProgressDetail.Current
+			layer.DownloadedBytes = msg.ProgressDetail.Total
+			layer.TotalBytes = msg.ProgressDetail.Total
+		}
 	case "Pull complete":
 		layer.ExtractedBytes = layer.TotalBytes
 		layer.DownloadedBytes = layer.TotalBytes
diff --git a/runner/internal/shim/docker_test.go b/runner/internal/shim/docker_test.go
index 259c76dcd..e8dbdc350 100644
--- a/runner/internal/shim/docker_test.go
+++ b/runner/internal/shim/docker_test.go
@@ -268,3 +268,31 @@ func TestPullTracker_MixedLayerStatuses(t *testing.T) {
 	assert.Equal(t, uint64(100+200), p.TotalBytes)
 	assert.False(t, p.IsTotalBytesFinal) // layer-waiting size unknown
 }
+
+func TestPullTracker_NonBytesExtractingUnit(t *testing.T) {
+	tracker := newPullTracker()
+	tracker.Update(PullMessage{Id: "3.11", Status: "Pulling from library/python"})
+	tracker.Update(PullMessage{Id: "aaa", Status: "Pulling fs layer"})
+	tracker.Update(pullMsg("aaa", "Downloading", 100, 200))
+	tracker.Update(pullMsg("aaa", "Downloading", 200, 200))
+	tracker.Update(PullMessage{Id: "aaa", Status: "Download complete"})
+	// Newer Docker daemons report extraction progress in seconds. Tested with 29.5.2
+	tracker.Update(PullMessage{Id: "aaa", Status: "Extracting", ProgressDetail: ProgressDetail{Current: 1, Units: "s"}})
+	tracker.Update(PullMessage{Id: "aaa", Status: "Extracting", ProgressDetail: ProgressDetail{Current: 2, Units: "s"}})
+
+	p := tracker.Progress()
+	require.NotNil(t, p)
+	assert.Equal(t, uint64(200), p.DownloadedBytes)
+	assert.Equal(t, uint64(0), p.ExtractedBytes) // reported in seconds, bytes unknown
+	assert.Equal(t, uint64(200), p.TotalBytes)
+	assert.True(t, p.IsTotalBytesFinal)
+
+	tracker.Update(PullMessage{Id: "aaa", Status: "Pull complete"})
+
+	p = tracker.Progress()
+	require.NotNil(t, p)
+	assert.Equal(t, uint64(200), p.DownloadedBytes)
+	assert.Equal(t, uint64(200), p.ExtractedBytes) // pull complete => extracted == total
+	assert.Equal(t, uint64(200), p.TotalBytes)
+	assert.True(t, p.IsTotalBytesFinal)
+}