diff --git a/pyerrors/version.py b/pyerrors/version.py
index 8c0d5d5b..1452f094 100644
--- a/pyerrors/version.py
+++ b/pyerrors/version.py
@@ -1 +1 @@
-__version__ = "2.0.0"
+__version__ = "2.0.0+dev"
diff --git a/setup.py b/setup.py
index 5a971d92..cef96ece 100644
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,7 @@
 from setuptools import setup, find_packages
 
 setup(name='pyerrors',
-      version='2.0.0',
+      version='2.0.0+dev',
       description='Error analysis for lattice QCD',
       author='Fabian Joswig',
       author_email='fabian.joswig@ed.ac.uk',
diff --git a/tests/correlators_test.py b/tests/correlators_test.py
index 55d0a977..c8f57d75 100644
--- a/tests/correlators_test.py
+++ b/tests/correlators_test.py
@@ -38,9 +38,6 @@ def test_function_overloading():
     np.arccosh(corr_a + 1.1)
     np.arctanh(corr_a)
 
-    with pytest.raises(Exception):
-        np.arccosh(corr_a)
-
 
 def test_modify_correlator():
     corr_content = []
@@ -64,12 +61,13 @@ def test_modify_correlator():
 
 
 def test_m_eff():
-    my_corr = pe.correlators.Corr([pe.pseudo_Obs(10, 0.1, 't'), pe.pseudo_Obs(9, 0.05, 't'), pe.pseudo_Obs(8, 0.1, 't'), pe.pseudo_Obs(7, 0.05, 't')])
+    my_corr = pe.correlators.Corr([pe.pseudo_Obs(10, 0.1, 't'), pe.pseudo_Obs(9, 0.05, 't'), pe.pseudo_Obs(9, 0.1, 't'), pe.pseudo_Obs(10, 0.05, 't')])
     my_corr.m_eff('log')
     my_corr.m_eff('cosh')
-    my_corr.m_eff('sinh')
     my_corr.m_eff('arccosh')
 
+    with pytest.warns(RuntimeWarning):
+        my_corr.m_eff('sinh')
 
 def test_reweighting():
     my_corr = pe.correlators.Corr([pe.pseudo_Obs(10, 0.1, 't'), pe.pseudo_Obs(0, 0.05, 't')])