diff --git a/CITATION.cff b/CITATION.cff
index 1868e7d0..4f3f1cc4 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -25,7 +25,7 @@ authors:
 - family-names: "Wang"
   given-names: "Ren"
 title: "Ensō"
-version: 0.4
+version: 0.4.0
 license: BSD-3-Clause-Clear
 # doi: 10.5281/zenodo.1234
 date-released: 2023-04-23
diff --git a/meson.build b/meson.build
index 44b80810..c927cd5a 100644
--- a/meson.build
+++ b/meson.build
@@ -1,4 +1,4 @@
-project('enso', 'c', 'cpp', version: '0.4', license: 'BSD-3-Clause',
+project('enso', 'c', 'cpp', version: '0.4.0', license: 'BSD-3-Clause',
         meson_version: '>=0.58.0',
         default_options: [
             'prefix=/usr/local',