diff --git a/tools/sgcloudspanner/emulator.go b/tools/sgcloudspanner/emulator.go
index fa046d2d..9ef868e9 100644
--- a/tools/sgcloudspanner/emulator.go
+++ b/tools/sgcloudspanner/emulator.go
@@ -3,11 +3,9 @@ package sgcloudspanner
 import (
 	"bytes"
 	"context"
-	"encoding/json"
 	"fmt"
 	"net"
 	"os"
-	"os/exec"
 	"strings"
 	"time"
 
@@ -18,10 +16,9 @@ import (
 // Cloud Spanner Emulator versions can be found here,
 // https://console.cloud.google.com/gcr/images/cloud-spanner-emulator/global/emulator
 const (
-	cloudbuildNetwork = "cloudbuild"
-	url               = "gcr.io/cloud-spanner-emulator/emulator"
-	version           = "1.5.17"
-	image             = url + ":" + version
+	url     = "gcr.io/cloud-spanner-emulator/emulator"
+	version = "1.5.17"
+	image   = url + ":" + version
 )
 
 // RunEmulator runs the Cloud Spanner emulator in Docker.
@@ -39,12 +36,7 @@ func RunEmulator(ctx context.Context) (_ func(), err error) {
 	if !isDockerDaemonRunning(ctx) {
 		return nil, fmt.Errorf("the Docker daemon does not seem to be running")
 	}
-	var dockerRunCmd *exec.Cmd
-	if isRunningOnCloudBuild(ctx) {
-		dockerRunCmd = sgdocker.Command(ctx, "run", "-d", "--network", cloudbuildNetwork, "--publish-all", image)
-	} else {
-		dockerRunCmd = sgdocker.Command(ctx, "run", "-d", "--publish-all", image)
-	}
+	dockerRunCmd := sgdocker.Command(ctx, "run", "-d", "--publish-all", image)
 	var dockerRunStdout strings.Builder
 	dockerRunCmd.Stdout = &dockerRunStdout
 	if err := dockerRunCmd.Run(); err != nil {
@@ -67,19 +59,10 @@ func RunEmulator(ctx context.Context) (_ func(), err error) {
 			sg.Logger(ctx).Printf("failed to unset SPANNER_EMULATOR_HOST: %v", err)
 		}
 	}
-	var emulatorHost string
-	if isRunningOnCloudBuild(ctx) {
-		emulatorHost, err = inspectPortAddressCloudbuild(ctx, containerID, "9010/tcp", image)
-		if err != nil {
-			cleanup()
-			return nil, err
-		}
-	} else {
-		emulatorHost, err = inspectPortAddress(ctx, containerID, "9010/tcp")
-		if err != nil {
-			cleanup()
-			return nil, err
-		}
+	emulatorHost, err := inspectPortAddress(ctx, containerID, "9010/tcp")
+	if err != nil {
+		cleanup()
+		return nil, err
 	}
 	if err := os.Setenv("SPANNER_EMULATOR_HOST", emulatorHost); err != nil {
 		cleanup()
@@ -118,45 +101,6 @@ func inspectPortAddress(ctx context.Context, containerID, containerPort string)
 	return "", fmt.Errorf("no mapping found for %s in container %s", containerPort, containerID)
 }
 
-func inspectPortAddressCloudbuild(ctx context.Context, containerID, containerPort, image string) (string, error) {
-	var stdout bytes.Buffer
-	cmd := sgdocker.Command(ctx, "inspect", containerID)
-	cmd.Stdout = &stdout
-	if err := cmd.Run(); err != nil {
-		return "", err
-	}
-	var containers []struct {
-		Config struct {
-			Image string
-		}
-		NetworkSettings struct {
-			Ports map[string][]struct {
-				HostPort string
-			}
-			Networks map[string]struct {
-				Gateway string
-			}
-		}
-	}
-	if err := json.NewDecoder(&stdout).Decode(&containers); err != nil {
-		return "", err
-	}
-	var host, port string
-
-	for _, container := range containers {
-		if container.Config.Image == image {
-			port = container.NetworkSettings.Ports[containerPort][0].HostPort // prefer first option
-		}
-		if network, ok := container.NetworkSettings.Networks[cloudbuildNetwork]; ok {
-			host = network.Gateway
-		}
-	}
-	if host == "" || port == "" {
-		return "", fmt.Errorf("failed to inspect container %s for port %s", containerID, containerPort)
-	}
-	return fmt.Sprintf("%s:%s", host, port), nil
-}
-
 func awaitReachable(ctx context.Context, addr string, wait, maxWait time.Duration) error {
 	deadline := time.Now().Add(maxWait)
 	for time.Now().Before(deadline) {
@@ -173,10 +117,3 @@ func awaitReachable(ctx context.Context, addr string, wait, maxWait time.Duratio
 	}
 	return fmt.Errorf("%s was unreachable for %v", addr, maxWait)
 }
-
-func isRunningOnCloudBuild(ctx context.Context) bool {
-	cmd := sgdocker.Command(ctx, "network", "inspect", cloudbuildNetwork)
-	var stdout bytes.Buffer
-	cmd.Stdout, cmd.Stderr = &stdout, nil
-	return cmd.Run() == nil
-}