diff --git a/CMakeLists.txt b/CMakeLists.txt
index e2d39ec..d70d62b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.16)
-project(LASP LANGUAGES C CXX VERSION 1.1)
+project(LASP LANGUAGES C CXX VERSION 1.6.2)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED)
diff --git a/README.md b/README.md
index 6f92c5c..d07e20c 100644
--- a/README.md
+++ b/README.md
@@ -144,3 +144,16 @@ This will build the documentation. It can be read by:
 
 - See examples directories for IPython notebooks.
 - Please refer to the [documentation](https://lasp.ascee.nl/) for features.
+
+
+# Development docs
+
+## Bumping version number
+
+When bumping the version number, please update the number in
+
+- `pyproject.toml`
+- `CMakeLists.txt`
+
+Then, create a commit with tag `vX.X.X`, and push it.
+
diff --git a/pyproject.toml b/pyproject.toml
index 42291aa..b040966 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ requires-python = ">=3.10"
 description = "Library for Acoustic Signal Processing"
 license = { "file" = "LICENSE" }
 authors = [{ "name" = "J.A. de Jong", "email" = "j.a.dejong@ascee.nl" }]
-version = "1.6.1"
+version = "1.6.2"
 
 keywords = ["DSP", "DAQ", "Signal processing"]
 
@@ -23,7 +23,7 @@ classifiers = [
 urls = { "Documentation" = "https://lasp.ascee.nl" }
 
 dependencies = [
-    "scipy==1.12",
+    "scipy>=1.13.1",
     "matplotlib>=3.7.2",
     "appdirs",
     "dataclasses_json",
diff --git a/python_src/lasp/filter/fir_design.py b/python_src/lasp/filter/fir_design.py
index ad742fb..5b43dfa 100644
--- a/python_src/lasp/filter/fir_design.py
+++ b/python_src/lasp/filter/fir_design.py
@@ -11,7 +11,8 @@ __all__ = ['freqResponse', 'bandpass_fir_design', 'lowpass_fir_design',
            'arbitrary_fir_design']
 
 import numpy as np
-from scipy.signal import freqz, hann, firwin2
+from scipy.signal import freqz, firwin2
+from scipy.signal.windows import hann
 from ..lasp_config import empty