diff --git a/.github/workflows/pytests.yml b/.github/workflows/pytests.yml
index d67342c..56f6e6b 100644
--- a/.github/workflows/pytests.yml
+++ b/.github/workflows/pytests.yml
@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix:
         os: ["ubuntu-latest", "macos-latest", "windows-latest"]
-        python-version: ['3.10', '3.11', '3.12']
+        python-version: ['3.10', '3.11', '3.12', '3.13']
 
     name: Python (${{ matrix.python-version }} on ${{ matrix.os }})
     steps:
diff --git a/CITATION.cff b/CITATION.cff
index 48d8a6e..908972c 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -8,5 +8,5 @@ authors:
   given-names: Una G.
   orchid: 'https://orcid.org/0000-0003-0048-5143'
 title: "Pydar: Cassini RADAR data extraction software"
-version: 1.3.3
+version: 1.4.0
 url: "https://github.com/unaschneck/pydar"
diff --git a/pyproject.toml b/pyproject.toml
index 2e131cd..5f03a93 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "pydar"
-version = "1.3.3"
+version = "v1.4.0"
 authors = [
   { name="Cora Schneck", email="cyschneck@gmail.com" },
   { name="Una Schneck", email="ugschneck@gmail.com" }