diff --git a/.github/workflows/run-tests.yaml b/.github/workflows/run-tests.yaml
index 83f05386..5ea73ebd 100644
--- a/.github/workflows/run-tests.yaml
+++ b/.github/workflows/run-tests.yaml
@@ -21,7 +21,7 @@ jobs:
     - name: Generate and install zcbor package
       run: |
         python setup.py bdist_wheel
-        pip install dist/zcbor-0.3.99-py3-none-any.whl
+        pip install dist/zcbor-0.4.0-py3-none-any.whl
         pip uninstall -y zcbor
         pip install -e .
 
diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 5df3cd60..53e6a0ea 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,4 +1,4 @@
-# zcbor v. 0.3.99
+# zcbor v. 0.4.0
 
 **cddl-gen has been renamed to zcbor!**
 
diff --git a/zcbor/VERSION b/zcbor/VERSION
index e0d1d2c1..60a2d3e9 100644
--- a/zcbor/VERSION
+++ b/zcbor/VERSION
@@ -1 +1 @@
-0.3.99
\ No newline at end of file
+0.4.0
\ No newline at end of file