diff --git a/environment.yml b/environment.yml
new file mode 100644
index 0000000..570382b
--- /dev/null
+++ b/environment.yml
@@ -0,0 +1,17 @@
+name: hidrokit-rainfall
+channels:
+  - conda-forge
+  - defaults
+dependencies:
+  - python=3.9.13
+  - pandas=1.5.1
+  - dash=2.7.0
+  - dash-bootstrap-components=1.2.1
+  - plotly=5.11.0
+  - statsmodels=0.13.5
+  - python-box=6.1.0
+  - pyyaml=6.0
+  - pip
+  - pip:
+    - dash-bootstrap-templates==1.0.7
+    - hidrokit==0.4.1
diff --git a/pylayoutfunc.py b/pylayoutfunc.py
index 724269b..78a220e 100644
--- a/pylayoutfunc.py
+++ b/pylayoutfunc.py
@@ -1,3 +1,4 @@
+from __future__ import annotations
 from dash import html, dash_table, dcc
 import dash_bootstrap_components as dbc
 from pytemplate import hktemplate
diff --git a/requirements.txt b/requirements.txt
index 094a4e7..3499a36 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,12 +1,19 @@
-dash==2.3.1
-dash_bootstrap_components==1.1.0
-dash_bootstrap_templates==1.0.5
-numpy==1.22.3
-pandas==1.4.2
-plotly==5.7.0
-python_box==6.0.2
-requests==2.27.1
-statsmodels
-pyyaml
-gunicorn
+# PYTHON 3.9.13
+
+# available in conda-forge
+pandas==1.5.1
+dash==2.7.0
+dash-bootstrap-components==1.2.1
+plotly==5.11.0
+python-box==6.1.0
+pyyaml==6.0
+statsmodels==0.13.5
+
+# pip exclusive (available in conda with different name)
+
+# pip only
+dash-bootstrap-templates==1.0.7
 hidrokit==0.4.1
+
+# server only
+gunicorn==20.1.0
diff --git a/runtime.txt b/runtime.txt
index a5da7cc..c6f7782 100644
--- a/runtime.txt
+++ b/runtime.txt
@@ -1 +1 @@
-python-3.10.5
+python-3.9.13