diff --git a/HISTORY.md b/HISTORY.md
index a5acee0..39094a7 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,5 +1,8 @@
 # History of versions #
 
+* Version 4.21.0 (2025-02-08)
+  * Fixed crash when opening an old project
+
 * version 4.20.0 (2025-01-18)
   * Fixed FFMPEG version detection
   * Fixed UI translations
diff --git a/debian/control b/debian/control
index db54738..f74435a 100644
--- a/debian/control
+++ b/debian/control
@@ -7,7 +7,7 @@ Vcs-Git: https://gitlab.com/rastersoft/devedeng.git
 
 Package: python3-devedeng
 Architecture: all
-Version: 4.20.0-1
+Version: 4.21.0-1
 Depends: python3:any, dh-python, python3, python3-urllib3, python3-gi, python3-cairo, python3-gi-cairo, libgtk-3-0t64|libgtk-3-0, ffmpeg (>= 7:1.2.6) | libav-tools (>= 6:9.16), mplayer | mpv | vlc, dvdauthor, genisoimage, vcdimager, libvorbis0a, libvorbisfile3, python3-pkg-resources
 Section: python
 Priority: optional
diff --git a/pyproject.toml b/pyproject.toml
index 8c3cb1f..20ae2b5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "devedeng"
-version = "4.20.0"
+version = "4.21.0"
 authors = [
   { name="Raster Software Vigo (Sergio Costas)", email="rastersoft@gmail.com" },
 ]