diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index e86ed0f..408e3e1 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -11,7 +11,7 @@ jobs:
     - uses: actions/checkout@v3
     - uses: actions/setup-go@v3
       with:
-        go-version: '1.20'
+        go-version: '1.21'
         cache: true
     - name: Get dependencies
       run: go mod download
diff --git a/go.mod b/go.mod
index d41d754..addb25f 100644
--- a/go.mod
+++ b/go.mod
@@ -1,7 +1,5 @@
 module github.com/carlmjohnson/flowmatic
 
-go 1.20
+go 1.21
 
-require github.com/carlmjohnson/deque v0.22.0
-
-require golang.org/x/exp v0.0.0-20230116083435-1de6713980de
+require github.com/carlmjohnson/deque v0.23.1
diff --git a/go.sum b/go.sum
index a284e35..ff92626 100644
--- a/go.sum
+++ b/go.sum
@@ -1,4 +1,2 @@
-github.com/carlmjohnson/deque v0.22.0 h1:yIaXxHcj6/jUK834fMTZUgYavW/0IdA3whrzVvfqvv4=
-github.com/carlmjohnson/deque v0.22.0/go.mod h1:6171GeeDBqexi4z2OoIsqfJfD2BK+MdlhfwOxurcniA=
-golang.org/x/exp v0.0.0-20230116083435-1de6713980de h1:DBWn//IJw30uYCgERoxCg84hWtA97F4wMiKOIh00Uf0=
-golang.org/x/exp v0.0.0-20230116083435-1de6713980de/go.mod h1:CxIveKay+FTh1D0yPZemJVgC/95VzuuOLq5Qi4xnoYc=
+github.com/carlmjohnson/deque v0.23.1 h1:X2HOJM9xcglY03deMZ0oZ1V2xtbqYV7dJDnZiSZN4Ak=
+github.com/carlmjohnson/deque v0.23.1/go.mod h1:LF5NJjICBrEOPx84pxPL4nCimy5n9NQjxKi5cXkh+8U=
diff --git a/manage_tasks.go b/manage_tasks.go
index 54b8d60..f1d5988 100644
--- a/manage_tasks.go
+++ b/manage_tasks.go
@@ -36,7 +36,7 @@ func ManageTasks[Input, Output any](numWorkers int, task Task[Input, Output], ma
 		select {
 		case inch <- item:
 			inflight++
-			queue.PopHead()
+			queue.RemoveFront()
 		case r := <-out:
 			inflight--
 			if r.Panic != nil {
@@ -46,7 +46,7 @@ func ManageTasks[Input, Output any](numWorkers int, task Task[Input, Output], ma
 			if !ok {
 				return
 			}
-			queue.Append(items...)
+			queue.PushBackSlice(items)
 		}
 	}
 }
diff --git a/manage_tasks_example_test.go b/manage_tasks_example_test.go
index 824871c..5f31662 100644
--- a/manage_tasks_example_test.go
+++ b/manage_tasks_example_test.go
@@ -5,12 +5,11 @@ import (
 	"io"
 	"net/http"
 	"net/http/httptest"
+	"slices"
 	"strings"
 	"testing/fstest"
 
 	"github.com/carlmjohnson/flowmatic"
-	"golang.org/x/exp/maps"
-	"golang.org/x/exp/slices"
 )
 
 func ExampleManageTasks() {
@@ -76,7 +75,10 @@ func ExampleManageTasks() {
 	// Process the tasks with as many workers as GOMAXPROCS
 	flowmatic.ManageTasks(flowmatic.MaxProcs, task, manager, "/")
 
-	keys := maps.Keys(results)
+	keys := make([]string, 0, len(results))
+	for key := range results {
+		keys = append(keys, key)
+	}
 	slices.Sort(keys)
 	for _, key := range keys {
 		fmt.Println(key, "links to:")