diff --git a/envs/environment.fixed.yaml b/envs/environment.fixed.yaml
index bc610a5a..67fff66f 100644
--- a/envs/environment.fixed.yaml
+++ b/envs/environment.fixed.yaml
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: : 2017-2024 The PyPSA-Eur Authors
+#
+# SPDX-License-Identifier: CC0-1.0
+
 name: pypsa-eur
 channels:
 - conda-forge
diff --git a/envs/environment.yaml b/envs/environment.yaml
index dc5fad2b..37c3870b 100644
--- a/envs/environment.yaml
+++ b/envs/environment.yaml
@@ -1,6 +1,6 @@
 # SPDX-FileCopyrightText: : 2017-2024 The PyPSA-Eur Authors
 #
-# SPDX-License-Identifier: MIT
+# SPDX-License-Identifier: CC0-1.0
 
 name: pypsa-eur
 channels: