diff --git a/README.md b/README.md
index e9ffb20..000d92e 100644
--- a/README.md
+++ b/README.md
@@ -50,5 +50,6 @@ poetry export -f requirements.txt --output requirements.txt
 * `--default`: Only export the main dependencies. (**Deprecated**)
 * `--dev`: Include development dependencies. (**Deprecated**)
 * `--extras (-E)`: Extra sets of dependencies to include.
+* `--all-extras`: Include all sets of extra dependencies.
 * `--without-hashes`: Exclude hashes from the exported file.
 * `--with-credentials`: Include credentials for extra indices.
diff --git a/docs/_index.md b/docs/_index.md
index cd34c3d..0837c86 100644
--- a/docs/_index.md
+++ b/docs/_index.md
@@ -73,5 +73,6 @@ poetry export --only test,docs
 * `--default`: Only export the main dependencies. (**Deprecated**)
 * {{< option name="dev" deprecated=true >}}Include development dependencies.{{< /option >}}
 * `--extras (-E)`: Extra sets of dependencies to include.
+* `--all-extras`: Include all sets of extra dependencies.
 * `--without-hashes`: Exclude hashes from the exported file.
 * `--with-credentials`: Include credentials for extra indices.
diff --git a/src/poetry_plugin_export/command.py b/src/poetry_plugin_export/command.py
index 854493f..06ca162 100644
--- a/src/poetry_plugin_export/command.py
+++ b/src/poetry_plugin_export/command.py
@@ -1,8 +1,10 @@
 from __future__ import annotations
 
 from pathlib import Path
+from typing import TYPE_CHECKING
 
 from cleo.helpers import option
+from packaging.utils import NormalizedName
 from packaging.utils import canonicalize_name
 from poetry.console.commands.group_command import GroupCommand
 from poetry.core.packages.dependency_group import MAIN_GROUP
@@ -10,6 +12,10 @@
 from poetry_plugin_export.exporter import Exporter
 
 
+if TYPE_CHECKING:
+    from collections.abc import Iterable
+
+
 class ExportCommand(GroupCommand):
     name = "export"
     description = "Exports the lock file to alternative formats."
@@ -43,6 +49,7 @@ class ExportCommand(GroupCommand):
             flag=False,
             multiple=True,
         ),
+        option("all-extras", None, "Include all sets of extra dependencies."),
         option("with-credentials", None, "Include credentials for extra indices."),
     ]
 
@@ -86,16 +93,28 @@ def handle(self) -> int:
             )
 
         # Checking extras
-        extras = {
-            canonicalize_name(extra)
-            for extra_opt in self.option("extras")
-            for extra in extra_opt.split()
-        }
-        invalid_extras = extras - self.poetry.package.extras.keys()
-        if invalid_extras:
-            raise ValueError(
-                f"Extra [{', '.join(sorted(invalid_extras))}] is not specified."
+        if self.option("extras") and self.option("all-extras"):
+            self.line_error(
+                "<error>You cannot specify explicit"
+                " `<fg=yellow;options=bold>--extras</>` while exporting"
+                " using `<fg=yellow;options=bold>--all-extras</>`.</error>"
             )
+            return 1
+
+        extras: Iterable[NormalizedName]
+        if self.option("all-extras"):
+            extras = self.poetry.package.extras.keys()
+        else:
+            extras = {
+                canonicalize_name(extra)
+                for extra_opt in self.option("extras")
+                for extra in extra_opt.split()
+            }
+            invalid_extras = extras - self.poetry.package.extras.keys()
+            if invalid_extras:
+                raise ValueError(
+                    f"Extra [{', '.join(sorted(invalid_extras))}] is not specified."
+                )
 
         exporter = Exporter(self.poetry, self.io)
         exporter.only_groups(list(self.activated_groups))
diff --git a/tests/command/test_command_export.py b/tests/command/test_command_export.py
index 6f37fe3..9e72175 100644
--- a/tests/command/test_command_export.py
+++ b/tests/command/test_command_export.py
@@ -220,6 +220,24 @@ def test_export_reports_invalid_extras(tester: CommandTester, do_lock: None) ->
     assert str(error.value) == expected
 
 
+def test_export_with_all_extras(tester: CommandTester, do_lock: None) -> None:
+    tester.execute("--format requirements.txt --all-extras")
+    output = tester.io.fetch_output()
+    assert f"bar==1.1.0 ; {MARKER_PY}" in output
+    assert f"qux==1.2.0 ; {MARKER_PY}" in output
+
+
+def test_extras_conflicts_all_extras(tester: CommandTester, do_lock: None) -> None:
+    tester.execute("--extras bar --all-extras")
+
+    assert tester.status_code == 1
+    assert (
+        tester.io.fetch_error()
+        == "You cannot specify explicit `--extras` while exporting using"
+        " `--all-extras`.\n"
+    )
+
+
 def test_export_with_urls(
     monkeypatch: MonkeyPatch, tester: CommandTester, poetry: Poetry
 ) -> None: