diff --git a/lib/graph/graph.js b/lib/graph/graph.js
index 892c84068..1f77bbb58 100644
--- a/lib/graph/graph.js
+++ b/lib/graph/graph.js
@@ -29,8 +29,8 @@ const log = getLogger("generateProjectGraph");
  * @param {string} [options.versionOverride] Framework version to use instead of the one defined in the root project
  * @param {string} [options.resolveFrameworkDependencies=true]
  * 		Whether framework dependencies should be added to the graph
- * @param {string} [options.workspaceName]
- * 		Name of the workspace configuration that should be used if any is provided
+ * @param {string|null} [options.workspaceName=default]
+ * 		Name of the workspace configuration that should be used. "default" if not provided.
  * @param {module:@ui5/project/ui5Framework/maven/CacheMode} [options.cacheMode]
  *      Cache mode to use when consuming SNAPSHOT versions of a framework
  * @param {string} [options.workspaceConfigPath=ui5-workspace.yaml]
@@ -43,7 +43,7 @@ const log = getLogger("generateProjectGraph");
 export async function graphFromPackageDependencies({
 	cwd, rootConfiguration, rootConfigPath,
 	versionOverride, cacheMode, resolveFrameworkDependencies = true,
-	workspaceName /* TODO 4.0: default workspaceName to "default" ? */,
+	workspaceName="default",
 	workspaceConfiguration, workspaceConfigPath = "ui5-workspace.yaml"
 }) {
 	log.verbose(`Creating project graph using npm provider...`);
diff --git a/test/lib/graph/graph.js b/test/lib/graph/graph.js
index c11bfbc88..4cc4c1386 100644
--- a/test/lib/graph/graph.js
+++ b/test/lib/graph/graph.js
@@ -58,7 +58,8 @@ test.serial("graphFromPackageDependencies", async (t) => {
 		rootConfiguration: "rootConfiguration",
 		rootConfigPath: "/rootConfigPath",
 		versionOverride: "versionOverride",
-		cacheMode: CacheMode.Off
+		cacheMode: CacheMode.Off,
+		workspaceName: null
 	});
 
 	t.is(res, "graph");
@@ -147,7 +148,8 @@ test.serial("graphFromPackageDependencies with workspace object", async (t) => {
 		rootConfiguration: "rootConfiguration",
 		rootConfigPath: "/rootConfigPath",
 		versionOverride: "versionOverride",
-		workspaceConfiguration: "workspaceConfiguration"
+		workspaceConfiguration: "workspaceConfiguration",
+		workspaceName: null
 	});
 
 	t.is(res, "graph");
@@ -156,7 +158,7 @@ test.serial("graphFromPackageDependencies with workspace object", async (t) => {
 	t.deepEqual(createWorkspaceStub.getCall(0).args[0], {
 		cwd: path.join(__dirname, "..", "..", "..", "cwd"),
 		configPath: "ui5-workspace.yaml",
-		name: undefined,
+		name: null,
 		configObject: "workspaceConfiguration"
 	}, "createWorkspace called with correct parameters");
 });
@@ -281,6 +283,24 @@ test.serial("graphFromPackageDependencies: Do not resolve framework dependencies
 	t.is(enrichProjectGraphStub.callCount, 0, "enrichProjectGraph did not get called");
 });
 
+test.serial("graphFromPackageDependencies: Default workspace name", async (t) => {
+	const {createWorkspaceStub} = t.context;
+	const {graphFromPackageDependencies} = t.context.graph;
+
+	const res = await graphFromPackageDependencies({
+		cwd: "cwd",
+		rootConfiguration: "rootConfiguration",
+		rootConfigPath: "/rootConfigPath",
+		versionOverride: "versionOverride",
+		resolveFrameworkDependencies: false
+	});
+
+	t.is(res, "graph");
+	t.true(createWorkspaceStub.calledOnce, "createWorkspace is called");
+	t.is(createWorkspaceStub.getCall(0).args[0].name, "default",
+		"createWorkspace is called with 'default' workspace");
+});
+
 test.serial("graphFromStaticFile", async (t) => {
 	const {
 		dependencyTreeProviderStub,