diff --git a/CITATION.cff b/CITATION.cff
index 5d59904..38a2d5d 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -5,7 +5,7 @@ authors:
   - family-names: Kruse
     given-names: Nicolas
     orcid: "https://orcid.org/0000-0001-6758-2269"
-version: 1.0.0
+version: 1.0.1
 #date-released: "2025-04-01"
 #identifiers:
 #  - description: This is the collection of archived snapshots of all versions of My Research Software
diff --git a/notes/build.md b/notes/build.md
index a837cda..663986b 100644
--- a/notes/build.md
+++ b/notes/build.md
@@ -9,6 +9,10 @@ cd pyhoff
 python -m venv ./.venv
 source ./.venv/bin/activate  # On Windows use `.\.venv\Scripts\activate`
 
+# Update version number in
+# - pyproject.toml
+# - CITATION.cff
+
 # Check code:
 pip install -r requirements-dev.txt
 flake8
diff --git a/pyproject.toml b/pyproject.toml
index d0122ef..5319529 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "pyhoff"
-version = "1.0.0"
+version = "1.0.1"
 authors = [
   { name="Nicolas Kruse", email="nicolas.kruse@nonan.net" },
 ]