diff --git a/tests/fixtures.py b/tests/fixtures.py
index 6077be6..359cd03 100644
--- a/tests/fixtures.py
+++ b/tests/fixtures.py
@@ -6,7 +6,6 @@
 (see LICENSE for details).
 """
 
-import joblib
 import numpy as np
 import os
 import pandas as pd
@@ -51,8 +50,8 @@ def predict(self, _):
 
 @pytest.fixture()
 def data_source_df():
-    return joblib.load(
-        os.path.join(os.path.dirname(__file__), "testdata/daily_1.joblib")
+    return pd.read_pickle(
+        os.path.join(os.path.dirname(__file__), "testdata/daily_1.pkl")
     )
 
 
diff --git a/tests/test_data.py b/tests/test_data.py
index f0c02b8..bb38514 100644
--- a/tests/test_data.py
+++ b/tests/test_data.py
@@ -7,7 +7,6 @@
 """
 
 import akshare
-import joblib
 import os
 import pandas as pd
 import pytest
@@ -48,8 +47,8 @@
 
 @pytest.fixture()
 def alpaca_df():
-    df = joblib.load(
-        os.path.join(os.path.dirname(__file__), "testdata/daily_1.joblib")
+    df = pd.read_pickle(
+        os.path.join(os.path.dirname(__file__), "testdata/daily_1.pkl")
     )
     df["date"] = df["date"].dt.tz_localize("US/Eastern")
     return df.assign(vwap=1)[ALPACA_COLS]
@@ -57,8 +56,8 @@ def alpaca_df():
 
 @pytest.fixture()
 def alpaca_crypto_df():
-    df = joblib.load(
-        os.path.join(os.path.dirname(__file__), "testdata/daily_1.joblib")
+    df = pd.read_pickle(
+        os.path.join(os.path.dirname(__file__), "testdata/daily_1.pkl")
     )
     df["date"] = df["date"].dt.tz_localize("US/Eastern")
     return df.assign(vwap=1, trade_count=1)[ALPACA_CRYPTO_COLS]
@@ -76,17 +75,15 @@ def crypto_bars_df(alpaca_crypto_df):
 
 @pytest.fixture()
 def yfinance_df():
-    return joblib.load(
-        os.path.join(os.path.dirname(__file__), "testdata/yfinance.joblib")
+    return pd.read_pickle(
+        os.path.join(os.path.dirname(__file__), "testdata/yfinance.pkl")
     )
 
 
 @pytest.fixture()
 def yfinance_single_df():
-    return joblib.load(
-        os.path.join(
-            os.path.dirname(__file__), "testdata/yfinance_single.joblib"
-        )
+    return pd.read_pickle(
+        os.path.join(os.path.dirname(__file__), "testdata/yfinance_single.pkl")
     )
 
 
diff --git a/tests/test_eval.py b/tests/test_eval.py
index b76a74f..ee7f8aa 100644
--- a/tests/test_eval.py
+++ b/tests/test_eval.py
@@ -6,7 +6,6 @@
 (see LICENSE for details).
 """
 
-import joblib
 import math
 import numpy as np
 import os
@@ -68,15 +67,15 @@ def calc_bootstrap(request):
 
 @pytest.fixture()
 def portfolio_df():
-    return joblib.load(
-        os.path.join(os.path.dirname(__file__), "testdata/portfolio_df.joblib")
+    return pd.read_pickle(
+        os.path.join(os.path.dirname(__file__), "testdata/portfolio_df.pkl")
     )
 
 
 @pytest.fixture()
 def trades_df():
-    return joblib.load(
-        os.path.join(os.path.dirname(__file__), "testdata/trades_df.joblib")
+    return pd.read_pickle(
+        os.path.join(os.path.dirname(__file__), "testdata/trades_df.pkl")
     )
 
 
diff --git a/tests/test_strategy.py b/tests/test_strategy.py
index fa40ec7..ed6df16 100644
--- a/tests/test_strategy.py
+++ b/tests/test_strategy.py
@@ -6,7 +6,6 @@
 (see LICENSE for details).
 """
 
-import joblib
 import numpy as np
 import os
 import pandas as pd
@@ -1129,8 +1128,8 @@ class FakeDataSource(DataSource):
     def _fetch_data(
         self, symbols, start_date, end_date, timeframe, adjustment
     ):
-        return joblib.load(
-            os.path.join(os.path.dirname(__file__), "testdata/daily_1.joblib")
+        return pd.read_pickle(
+            os.path.join(os.path.dirname(__file__), "testdata/daily_1.pkl")
         )
 
 
diff --git a/tests/testdata/daily_1.joblib b/tests/testdata/daily_1.pkl
similarity index 97%
rename from tests/testdata/daily_1.joblib
rename to tests/testdata/daily_1.pkl
index a09b346..d4b8333 100644
Binary files a/tests/testdata/daily_1.joblib and b/tests/testdata/daily_1.pkl differ
diff --git a/tests/testdata/portfolio_df.joblib b/tests/testdata/portfolio_df.pkl
similarity index 97%
rename from tests/testdata/portfolio_df.joblib
rename to tests/testdata/portfolio_df.pkl
index 0f37f4d..e803fed 100644
Binary files a/tests/testdata/portfolio_df.joblib and b/tests/testdata/portfolio_df.pkl differ
diff --git a/tests/testdata/trades_df.joblib b/tests/testdata/trades_df.pkl
similarity index 85%
rename from tests/testdata/trades_df.joblib
rename to tests/testdata/trades_df.pkl
index 66cf992..6a571b9 100644
Binary files a/tests/testdata/trades_df.joblib and b/tests/testdata/trades_df.pkl differ
diff --git a/tests/testdata/yfinance.joblib b/tests/testdata/yfinance.pkl
similarity index 90%
rename from tests/testdata/yfinance.joblib
rename to tests/testdata/yfinance.pkl
index 9698b13..ab713a7 100644
Binary files a/tests/testdata/yfinance.joblib and b/tests/testdata/yfinance.pkl differ
diff --git a/tests/testdata/yfinance_single.joblib b/tests/testdata/yfinance_single.pkl
similarity index 93%
rename from tests/testdata/yfinance_single.joblib
rename to tests/testdata/yfinance_single.pkl
index c09bbbc..df82960 100644
Binary files a/tests/testdata/yfinance_single.joblib and b/tests/testdata/yfinance_single.pkl differ