diff --git a/continuous_integration/environment-3.10.yml b/continuous_integration/environment-3.10.yml
index 8cab308c..b68f66ff 100644
--- a/continuous_integration/environment-3.10.yml
+++ b/continuous_integration/environment-3.10.yml
@@ -16,5 +16,6 @@ dependencies:
   - flake8
   - act-atmos
   - pint
+  - openpyxl
   - pip:
     - pymiescatt
diff --git a/continuous_integration/environment-3.11.yml b/continuous_integration/environment-3.11.yml
index bf02cde3..30d1c7ca 100644
--- a/continuous_integration/environment-3.11.yml
+++ b/continuous_integration/environment-3.11.yml
@@ -16,5 +16,6 @@ dependencies:
   - flake8
   - act-atmos
   - pint
+  - openpyxl
   - pip:
     - pymiescatt
diff --git a/continuous_integration/environment-3.12.yml b/continuous_integration/environment-3.12.yml
index 2614c319..58e52492 100644
--- a/continuous_integration/environment-3.12.yml
+++ b/continuous_integration/environment-3.12.yml
@@ -16,5 +16,6 @@ dependencies:
   - flake8
   - act-atmos
   - pint
+  - openpyxl
   - pip:
     - pymiescatt
diff --git a/continuous_integration/environment-3.13.yml b/continuous_integration/environment-3.13.yml
new file mode 100644
index 00000000..65ca6a16
--- /dev/null
+++ b/continuous_integration/environment-3.13.yml
@@ -0,0 +1,21 @@
+name: testenv
+channels:
+  - conda-forge
+  - defaults
+dependencies:
+  - python=3.13
+  - pip
+  - numpy
+  - scipy
+  - matplotlib
+  - netcdf4
+  - pytest
+  - pytest-mpl
+  - pytest-cov
+  - dask
+  - flake8
+  - act-atmos
+  - pint
+  - openpyxl
+  - pip:
+    - pymiescatt
diff --git a/continuous_integration/environment_docs.yml b/continuous_integration/environment_docs.yml
index c90fa36d..b2005932 100644
--- a/continuous_integration/environment_docs.yml
+++ b/continuous_integration/environment_docs.yml
@@ -16,6 +16,7 @@ dependencies:
   - flake8
   - pint
   - act-atmos
+  - openpyxl
   - sphinx
   - doctr
   - pandoc
diff --git a/requirements.txt b/requirements.txt
index b676ccff..3bb3c490 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ xarray
 pint
 act-atmos
 nc-time-axis
+openpyxl
diff --git a/setup.py b/setup.py
index 3a63d0f1..637d9a19 100644
--- a/setup.py
+++ b/setup.py
@@ -27,7 +27,7 @@ def read(filename):
     include_package_data=True,
     packages=find_packages(exclude=('tests',)),
 
-    install_requires=[],
+    install_requires=['numpy', 'xarray', 'pint', 'act-atmos', 'nc-time-axis', 'openpyxl'],
 
     classifiers=[
         'Development Status :: 5 - Production/Stable',