diff --git a/pyproject.toml b/pyproject.toml
index 9dfee0b..ddb4254 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,8 @@ requires-python = ">=3.9"
 dependencies = [
     "PyYAML",
     "tqdm",
-    "dill"
+    "dill",
+    "pandas"
 ]
 
 [project.scripts]
@@ -36,7 +37,6 @@ dev = [
 ]
 
 demos = [
-    "pandas",
     "geopandas",
     "matplotlib",
     "shapely"
diff --git a/requirements.txt b/requirements.txt
index d58181d..31a11e0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,13 +2,25 @@
 # This file is autogenerated by pip-compile with Python 3.11
 # by the following command:
 #
-#    pip-compile
+#    pip-compile --output-file=requirements.txt
 #
 colorama==0.4.6
     # via tqdm
 dill==0.3.7
     # via wsimod (pyproject.toml)
+numpy==1.26.2
+    # via pandas
+pandas==2.1.3
+    # via wsimod (pyproject.toml)
+python-dateutil==2.8.2
+    # via pandas
+pytz==2023.3.post1
+    # via pandas
 pyyaml==6.0.1
     # via wsimod (pyproject.toml)
+six==1.16.0
+    # via python-dateutil
 tqdm==4.66.1
     # via wsimod (pyproject.toml)
+tzdata==2023.3
+    # via pandas