diff --git a/CITATION.cff b/CITATION.cff
index c73da2025..1ab76d177 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -39,7 +39,7 @@ authors:
 
 date-released: 2023-03-23
 doi: 10.5281/zenodo.7869553
-version: "1.8.0"
+version: "1.8.1"
 repository-code: "https://github.com/EIT-ALIVE/eitprocessing"
 keywords:
   - Mechanical lung ventilation
diff --git a/eitprocessing/__init__.py b/eitprocessing/__init__.py
index 29654eec0..2d986fc50 100644
--- a/eitprocessing/__init__.py
+++ b/eitprocessing/__init__.py
@@ -1 +1 @@
-__version__ = "1.8.0"
+__version__ = "1.8.1"
diff --git a/eitprocessing/filters/__init__.py b/eitprocessing/filters/__init__.py
index 92e9c321e..ce403f79c 100644
--- a/eitprocessing/filters/__init__.py
+++ b/eitprocessing/filters/__init__.py
@@ -3,8 +3,8 @@
 
 import numpy as np
 
+from eitprocessing.datahandling.continuousdata import ContinuousData
 from eitprocessing.datahandling.eitdata import EITData
-from tests.test_breath_detection import ContinuousData
 
 T = TypeVar("T", bound=np.ndarray | ContinuousData | EITData)
 
diff --git a/pyproject.toml b/pyproject.toml
index 73468af18..3fb5b1b77 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "eitprocessing"
-version = "1.8.0"
+version = "1.8.1"
 description = "Processing of lung image data from electrical impedance tomography."
 readme = "README.md"
 requires-python = ">=3.10"
@@ -174,7 +174,7 @@ isort.known-first-party = ["eitprocessing"]
 "docs/*" = ["ALL"]
 
 [tool.bumpversion]
-current_version = "1.8.0"
+current_version = "1.8.1"
 
 [[tool.bumpversion.files]]
 filename = "pyproject.toml"