diff --git a/common/requirements.txt b/common/requirements.txt
new file mode 100644
index 0000000..4f4c22d
--- /dev/null
+++ b/common/requirements.txt
@@ -0,0 +1,18 @@
+# Copyright (C) 2020-2022 F4PGA Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+python-constraint
+https://github.com/chipsalliance/f4pga/archive/c342fc6ff1684f3dc6072713730ac9fc574ab2f3.zip#subdirectory=f4pga
diff --git a/eos-s3/environment.yml b/eos-s3/environment.yml
index ba1a59f..8eab9d6 100644
--- a/eos-s3/environment.yml
+++ b/eos-s3/environment.yml
@@ -1,6 +1,24 @@
+# Copyright (C) 2020-2022 F4PGA Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 name: eos-s3
+
 channels:
   - litex-hub
+
 dependencies:
   - litex-hub::yosys=0.19_10_g0098b32c6=20220706_001518_py37
   - litex-hub::symbiflow-yosys-plugins=1.0.0_7_1002_gd149693=20220706_001518
diff --git a/eos-s3/requirements.txt b/eos-s3/requirements.txt
index fe33f41..e201c9c 100644
--- a/eos-s3/requirements.txt
+++ b/eos-s3/requirements.txt
@@ -1,4 +1,20 @@
-python-constraint
+# Copyright (C) 2020-2022 F4PGA Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+-r ../common/requirements.txt
+
 serial
 git+https://github.com/antmicro/quicklogic-fasm@607849ec0bdef8740be33dbaa49d15a3d400f809
-https://github.com/chipsalliance/f4pga/archive/df55ee75e4a1da978ffa5f7385bed47faf255661.zip#subdirectory=f4pga
diff --git a/xc7/environment.yml b/xc7/environment.yml
index 7618e99..2e4434d 100644
--- a/xc7/environment.yml
+++ b/xc7/environment.yml
@@ -1,6 +1,24 @@
+# Copyright (C) 2020-2022 F4PGA Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 name: xc7
+
 channels:
   - litex-hub
+
 dependencies:
   - litex-hub::openfpgaloader==0.8.0_114_g057ce93=20220706_155948
   - litex-hub::prjxray-tools=0.1_3015_gae546d6b=20220708_203356
diff --git a/xc7/requirements.txt b/xc7/requirements.txt
index 0814d6f..16db0ff 100644
--- a/xc7/requirements.txt
+++ b/xc7/requirements.txt
@@ -1,3 +1,21 @@
+# Copyright (C) 2020-2022 F4PGA Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+-r ../common/requirements.txt
+
 intervaltree
 junit-xml
 numpy
@@ -13,8 +31,6 @@ simplejson
 sympy
 textx
 yapf==0.24.0
-python-constraint
-https://github.com/chipsalliance/f4pga/archive/df55ee75e4a1da978ffa5f7385bed47faf255661.zip#subdirectory=f4pga
 fasm
 git+https://github.com/f4pga/prjxray.git@ae546d6b7648bf4df9cf63f0b25b2028b5623c43#egg=prjxray
 git+https://github.com/chipsalliance/f4pga-xc-fasm.git@25dc605c9c0896204f0c3425b52a332034cf5e5c#egg=xc-fasm