diff --git a/croissance/estimation/smoothing/segments.py b/croissance/estimation/smoothing/segments.py
index 4032b9c..786b401 100644
--- a/croissance/estimation/smoothing/segments.py
+++ b/croissance/estimation/smoothing/segments.py
@@ -16,7 +16,7 @@ def segment_by_std_dev(series, increment=2, maximum=20):
     windows = []
     for i in range(start, duration, increment):
         for size in range(1, maximum + 1):
-            window = series[i : i + size * increment]
+            window = series.loc[i : i + size * increment]
             # Gaps in measurements may result in empty windows
             if not window.empty:
                 window = detrend(window)
@@ -57,7 +57,7 @@ def segment_points(series, segments):
     out = [(series.index[0], numpy.median(series[: series.index[0] + 1]))]
 
     def _add_knot(start, end):
-        window = series[start:end]
+        window = series.loc[start:end]
         if not window.empty:
             out.append(window_median(window, start, end))
 
diff --git a/pyproject.toml b/pyproject.toml
index 15012f0..3824451 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,7 +30,7 @@ dependencies = [
   "coloredlogs>=14.0.0",
   "matplotlib>=1.4.3",
   "numpy>=1.9.1",
-  "pandas>=0.18.0,<3.0.0",
+  "pandas>=0.18.0",
   "scipy>=0.14.0",
 ]
 # use requirements.txt instead of pyproject.toml for dependencies