diff --git a/pyproject.toml b/pyproject.toml
index cd650953..9e4757d8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,7 +22,7 @@ dependencies = [
     "lalsuite==7.26.1",
     "h5py~=3.11",
     "arviz~=0.19",
-    "pandas~=2.2",
+    "pandas>=2.2,<4.0",
     "qnm==0.4.4",
     "seaborn~=0.13",
     "numpyro==0.19.0",
diff --git a/requirements.txt b/requirements.txt
index f4237b16..347e43b1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ numpy==2.2.6
 lalsuite==7.26.1
 h5py~=3.11
 arviz~=0.19
-pandas~=2.2
+pandas>=2.2,<4.0
 qnm==0.4.4
 seaborn~=0.13
 jupyterlab