diff --git a/pyproject.toml b/pyproject.toml
index 5853e56..925e486 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,7 +40,7 @@ description = "A fast algo-trading platform with support for machine learning ba
 readme = "README.md"
 requires-python = ">=3.10, <3.12"
 classifiers = [
-    "Development Status :: 3 - Beta",
+    "Development Status :: 4 - Beta",
     "Intended Audience :: Developers",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
diff --git a/roboquant/monetary.py b/roboquant/monetary.py
index 9af852f..d9fc3dd 100644
--- a/roboquant/monetary.py
+++ b/roboquant/monetary.py
@@ -62,7 +62,7 @@ class ECBConversion(CurrencyConverter):
     __file_name = Path.home() / ".roboquant" / "eurofxref-hist.csv"
 
     def __init__(self):
-        self.rates: Dict[Currency, List[Any]] = {EUR: [(datetime.fromisoformat("2000-01-01T15:00:00Z"), 1.0)]}
+        self.rates: Dict[Currency, List[Any]] = {EUR: [(datetime.fromisoformat("2000-01-01T15:00:00+00:00"), 1.0)]}
         if not self.exists():
             self.download()
         self.parse()
@@ -90,7 +90,7 @@ def parse(self):
 
             header_len = len(currencies)
             for row in csv_reader:
-                d = datetime.fromisoformat(row[0] + "T15:00:00Z")
+                d = datetime.fromisoformat(row[0] + "T15:00:00+00:00")
                 for idx in range(header_len):
                     v = row[idx + 1]
                     if v and v != "N/A":
diff --git a/tests/unit/test_monetary.py b/tests/unit/test_monetary.py
index 02a7bc7..cff863e 100644
--- a/tests/unit/test_monetary.py
+++ b/tests/unit/test_monetary.py
@@ -55,7 +55,7 @@ def test_static_conversion(self):
         Amount.register_converter(NoConversion())
 
     def test_ecb_conversion(self):
-        now = datetime.fromisoformat("2020-01-01T00:00:00Z")
+        now = datetime.fromisoformat("2020-01-01T00:00:00+00:00")
         converter = ECBConversion()
         Amount.register_converter(converter)
         amt1 = Amount(GBP, 100.0)