diff --git a/client/signals.go b/client/signals.go
index 9a7d91b80..9488b2299 100644
--- a/client/signals.go
+++ b/client/signals.go
@@ -81,12 +81,3 @@ func GetOCIStopSignal(ctx context.Context, image Image, defaultSignal string) (s
 
 	return config.StopSignal, nil
 }
-
-// ParseSignal parses a given string into a syscall.Signal
-// the rawSignal can be a string with "SIG" prefix,
-// or a signal number in string format.
-//
-// Deprecated: Use github.com/moby/sys/signal instead.
-func ParseSignal(rawSignal string) (syscall.Signal, error) {
-	return signal.ParseSignal(rawSignal)
-}
diff --git a/integration/client/signals_test.go b/integration/client/signals_test.go
deleted file mode 100644
index 6b5435314..000000000
--- a/integration/client/signals_test.go
+++ /dev/null
@@ -1,48 +0,0 @@
-/*
-   Copyright The containerd Authors.
-
-   Licensed under the Apache License, Version 2.0 (the "License");
-   you may not use this file except in compliance with the License.
-   You may obtain a copy of the License at
-
-       http://www.apache.org/licenses/LICENSE-2.0
-
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
-*/
-
-package client
-
-import (
-	"fmt"
-	"syscall"
-	"testing"
-
-	. "github.com/containerd/containerd/v2/client"
-)
-
-func TestParseSignal(t *testing.T) {
-	testSignals := []struct {
-		raw  string
-		want syscall.Signal
-		err  bool
-	}{
-		{"1", syscall.Signal(1), false},
-		{"SIGKILL", syscall.SIGKILL, false},
-		{"NONEXIST", 0, true},
-	}
-	for _, ts := range testSignals {
-		t.Run(fmt.Sprintf("%s/%d/%t", ts.raw, ts.want, ts.err), func(t *testing.T) {
-			got, err := ParseSignal(ts.raw)
-			if ts.err && err == nil {
-				t.Errorf("ParseSignal(%s) should return error", ts.raw)
-			}
-			if !ts.err && got != ts.want {
-				t.Errorf("ParseSignal(%s) return %d, want %d", ts.raw, got, ts.want)
-			}
-		})
-	}
-}