diff --git a/README.md b/README.md
index 9c8b573..5fbf899 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,7 @@ poetry export -f requirements.txt --output requirements.txt
 * `--without`: The dependency groups to ignore when exporting.
 * `--with`: The optional dependency groups to include when exporting.
 * `--only`: The only dependency groups to include when exporting.
-* `--default`: Only export the default dependencies.
+* `--default`: Only export the main dependencies. (**Deprecated**)
 * `--dev`: Include development dependencies. (**Deprecated**)
 * `--extras (-E)`: Extra sets of dependencies to include.
 * `--without-hashes`: Exclude hashes from the exported file.
diff --git a/docs/_index.md b/docs/_index.md
index 9eee64a..6849144 100644
--- a/docs/_index.md
+++ b/docs/_index.md
@@ -70,7 +70,7 @@ poetry export --only test,docs
 * `--without`: The dependency groups to ignore when exporting.
 * `--with`: The optional dependency groups to include when exporting.
 * `--only`: The only dependency groups to include when exporting.
-* `--default`: Only export the default dependencies.
+* `--default`: Only export the main dependencies. (**Deprecated**)
 * {{< option name="dev" deprecated=true >}}Include development dependencies.{{< /option >}}
 * `--extras (-E)`: Extra sets of dependencies to include.
 * `--without-hashes`: Exclude hashes from the exported file.
diff --git a/src/poetry_plugin_export/command.py b/src/poetry_plugin_export/command.py
index 5cf81b0..2909728 100644
--- a/src/poetry_plugin_export/command.py
+++ b/src/poetry_plugin_export/command.py
@@ -3,6 +3,12 @@
 from cleo.helpers import option
 from poetry.console.commands.installer_command import InstallerCommand
 
+
+try:
+    from poetry.core.packages.dependency_group import MAIN_GROUP
+except ImportError:
+    MAIN_GROUP = "default"
+
 from poetry_plugin_export.exporter import Exporter
 
 
@@ -42,8 +48,8 @@ class ExportCommand(InstallerCommand):
     ]
 
     @property
-    def non_optional_groups(self) -> set[str]:
-        return {"default"}
+    def default_groups(self) -> set[str]:
+        return {MAIN_GROUP}
 
     def handle(self) -> None:
         fmt = self.option("format")
diff --git a/src/poetry_plugin_export/exporter.py b/src/poetry_plugin_export/exporter.py
index dff0bbb..a70dbb9 100644
--- a/src/poetry_plugin_export/exporter.py
+++ b/src/poetry_plugin_export/exporter.py
@@ -8,6 +8,12 @@
 from cleo.io.io import IO
 
 
+try:
+    from poetry.core.packages.dependency_group import MAIN_GROUP
+except ImportError:
+    MAIN_GROUP = "default"
+
+
 if TYPE_CHECKING:
     from pathlib import Path
 
@@ -30,7 +36,7 @@ def __init__(self, poetry: Poetry) -> None:
         self._with_credentials = False
         self._with_urls = True
         self._extras: list[str] = []
-        self._groups: Iterable[str] = ["default"]
+        self._groups: Iterable[str] = [MAIN_GROUP]
 
     @classmethod
     def is_format_supported(cls, fmt: str) -> bool:
diff --git a/tests/command/test_command_export.py b/tests/command/test_command_export.py
index 848d3cf..3dfe1f7 100644
--- a/tests/command/test_command_export.py
+++ b/tests/command/test_command_export.py
@@ -152,13 +152,13 @@ def test_export_uses_requirements_txt_format_by_default(
             f"baz==2.0.0 ; {MARKER_PY}\nfoo==1.0.0 ; {MARKER_PY}\nopt==2.2.0 ;"
             f" {MARKER_PY}\n",
         ),
-        ("--without default", "\n"),
+        ("--without main", "\n"),
         ("--without dev", f"foo==1.0.0 ; {MARKER_PY}\n"),
         ("--without opt", f"foo==1.0.0 ; {MARKER_PY}\n"),
-        ("--without default,dev,opt", "\n"),
-        ("--only default", f"foo==1.0.0 ; {MARKER_PY}\n"),
+        ("--without main,dev,opt", "\n"),
+        ("--only main", f"foo==1.0.0 ; {MARKER_PY}\n"),
         ("--only dev", f"baz==2.0.0 ; {MARKER_PY}\n"),
-        ("--only default,dev", f"baz==2.0.0 ; {MARKER_PY}\nfoo==1.0.0 ; {MARKER_PY}\n"),
+        ("--only main,dev", f"baz==2.0.0 ; {MARKER_PY}\nfoo==1.0.0 ; {MARKER_PY}\n"),
     ],
 )
 def test_export_groups(
diff --git a/tests/test_exporter.py b/tests/test_exporter.py
index e512079..38d86ce 100644
--- a/tests/test_exporter.py
+++ b/tests/test_exporter.py
@@ -540,7 +540,7 @@ def test_exporter_can_export_requirements_txt_with_nested_packages_and_markers_a
 
     exporter = Exporter(poetry)
     if dev:
-        exporter.only_groups(["default", "dev"])
+        exporter.only_groups(["main", "dev"])
     exporter.export("requirements.txt", Path(tmp_dir), "requirements.txt")
 
     with (Path(tmp_dir) / "requirements.txt").open(encoding="utf-8") as f:
@@ -715,7 +715,7 @@ def test_exporter_exports_requirements_txt_with_dev_packages_if_opted_in(
     set_package_requires(poetry)
 
     exporter = Exporter(poetry)
-    exporter.only_groups(["default", "dev"])
+    exporter.only_groups(["main", "dev"])
     exporter.export("requirements.txt", Path(tmp_dir), "requirements.txt")
 
     with (Path(tmp_dir) / "requirements.txt").open(encoding="utf-8") as f:
@@ -802,7 +802,7 @@ def test_exporter_exports_requirements_txt_without_optional_packages(
     set_package_requires(poetry)
 
     exporter = Exporter(poetry)
-    exporter.only_groups(["default", "dev"])
+    exporter.only_groups(["main", "dev"])
     exporter.export("requirements.txt", Path(tmp_dir), "requirements.txt")
 
     with (Path(tmp_dir) / "requirements.txt").open(encoding="utf-8") as f:
@@ -888,7 +888,7 @@ def test_exporter_exports_requirements_txt_with_optional_packages(
     set_package_requires(poetry)
 
     exporter = Exporter(poetry)
-    exporter.only_groups(["default", "dev"])
+    exporter.only_groups(["main", "dev"])
     exporter.with_hashes(False)
     exporter.with_extras(extras)
     exporter.export(
@@ -1457,7 +1457,7 @@ def test_exporter_exports_requirements_txt_with_legacy_packages(
     set_package_requires(poetry)
 
     exporter = Exporter(poetry)
-    exporter.only_groups(["default", "dev"])
+    exporter.only_groups(["main", "dev"])
     exporter.export("requirements.txt", Path(tmp_dir), "requirements.txt")
 
     with (Path(tmp_dir) / "requirements.txt").open(encoding="utf-8") as f:
@@ -1515,7 +1515,7 @@ def test_exporter_exports_requirements_txt_with_url_false(tmp_dir: str, poetry:
     set_package_requires(poetry)
 
     exporter = Exporter(poetry)
-    exporter.only_groups(["default", "dev"])
+    exporter.only_groups(["main", "dev"])
     exporter.with_urls(False)
     exporter.export("requirements.txt", Path(tmp_dir), "requirements.txt")
 
@@ -1566,7 +1566,7 @@ def test_exporter_exports_requirements_txt_with_legacy_packages_trusted_host(
     )
     set_package_requires(poetry)
     exporter = Exporter(poetry)
-    exporter.only_groups(["default", "dev"])
+    exporter.only_groups(["main", "dev"])
     exporter.export("requirements.txt", Path(tmp_dir), "requirements.txt")
 
     with (Path(tmp_dir) / "requirements.txt").open(encoding="utf-8") as f:
@@ -1650,7 +1650,7 @@ def test_exporter_exports_requirements_txt_with_dev_extras(
 
     exporter = Exporter(poetry)
     if dev:
-        exporter.only_groups(["default", "dev"])
+        exporter.only_groups(["main", "dev"])
     exporter.export("requirements.txt", Path(tmp_dir), "requirements.txt")
 
     with (Path(tmp_dir) / "requirements.txt").open(encoding="utf-8") as f:
@@ -1724,7 +1724,7 @@ def test_exporter_exports_requirements_txt_with_legacy_packages_and_duplicate_so
     set_package_requires(poetry)
 
     exporter = Exporter(poetry)
-    exporter.only_groups(["default", "dev"])
+    exporter.only_groups(["main", "dev"])
     exporter.export("requirements.txt", Path(tmp_dir), "requirements.txt")
 
     with (Path(tmp_dir) / "requirements.txt").open(encoding="utf-8") as f:
@@ -1790,7 +1790,7 @@ def test_exporter_exports_requirements_txt_with_legacy_packages_and_credentials(
     set_package_requires(poetry)
 
     exporter = Exporter(poetry)
-    exporter.only_groups(["default", "dev"])
+    exporter.only_groups(["main", "dev"])
     exporter.with_credentials()
     exporter.export(
         "requirements.txt",
@@ -1956,7 +1956,7 @@ def test_exporter_doesnt_confuse_repeated_packages(tmp_dir: str, poetry: Poetry)
     poetry._package = root
 
     exporter = Exporter(poetry)
-    exporter.only_groups(["default", "dev"])
+    exporter.only_groups(["main", "dev"])
     io = BufferedIO()
     exporter.export("requirements.txt", Path(tmp_dir), io)