diff --git a/src/poetry/core/packages/dependency.py b/src/poetry/core/packages/dependency.py
index c01ede94f..a539d59b6 100644
--- a/src/poetry/core/packages/dependency.py
+++ b/src/poetry/core/packages/dependency.py
@@ -253,7 +253,7 @@ def base_pep_508_name(self) -> str:
         requirement = self.pretty_name
 
         if self.extras:
-            extras = ",".join(self.extras)
+            extras = ",".join(sorted(self.extras))
             requirement += f"[{extras}]"
 
         if isinstance(self.constraint, VersionUnion):
diff --git a/src/poetry/core/packages/directory_dependency.py b/src/poetry/core/packages/directory_dependency.py
index 4c51b39cc..75512bd43 100644
--- a/src/poetry/core/packages/directory_dependency.py
+++ b/src/poetry/core/packages/directory_dependency.py
@@ -119,7 +119,7 @@ def base_pep_508_name(self) -> str:
         requirement = self.pretty_name
 
         if self.extras:
-            extras = ",".join(self.extras)
+            extras = ",".join(sorted(self.extras))
             requirement += f"[{extras}]"
 
         path = path_to_url(self.path) if self.path.is_absolute() else self.path
diff --git a/src/poetry/core/packages/file_dependency.py b/src/poetry/core/packages/file_dependency.py
index a1ecdcd30..a599f58e6 100644
--- a/src/poetry/core/packages/file_dependency.py
+++ b/src/poetry/core/packages/file_dependency.py
@@ -105,7 +105,7 @@ def base_pep_508_name(self) -> str:
         requirement = self.pretty_name
 
         if self.extras:
-            extras = ",".join(self.extras)
+            extras = ",".join(sorted(self.extras))
             requirement += f"[{extras}]"
 
         path = path_to_url(self.path) if self.path.is_absolute() else self.path
diff --git a/src/poetry/core/packages/url_dependency.py b/src/poetry/core/packages/url_dependency.py
index 69d34500a..8a8c0c7e6 100644
--- a/src/poetry/core/packages/url_dependency.py
+++ b/src/poetry/core/packages/url_dependency.py
@@ -46,7 +46,7 @@ def base_pep_508_name(self) -> str:
         requirement = self.pretty_name
 
         if self.extras:
-            extras = ",".join(self.extras)
+            extras = ",".join(sorted(self.extras))
             requirement += f"[{extras}]"
 
         requirement += f" @ {self._url}"
diff --git a/src/poetry/core/packages/vcs_dependency.py b/src/poetry/core/packages/vcs_dependency.py
index 241d5e798..6228d5fe4 100644
--- a/src/poetry/core/packages/vcs_dependency.py
+++ b/src/poetry/core/packages/vcs_dependency.py
@@ -110,7 +110,7 @@ def base_pep_508_name(self) -> str:
         parsed_url = git.ParsedUrl.parse(self._source)
 
         if self.extras:
-            extras = ",".join(self.extras)
+            extras = ",".join(sorted(self.extras))
             requirement += f"[{extras}]"
 
         if parsed_url.protocol is not None: