diff --git a/CITATION.cff b/CITATION.cff
index ad00d0edb29ecfe2edf4b1aeb621ff35f8304f90..9c8bf551c41a6a3447b076914741b349a8c72b9c 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -20,6 +20,6 @@ authors:
     given-names: Stefan
     orcid: https://orcid.org/0000-0001-7214-8125
 title: CaosDB - Crawler
-version: 0.3.0
+version: 0.4.0
 doi: 10.3390/data4020083
-date-released: 2023-01-30
\ No newline at end of file
+date-released: 2023-03-22
\ No newline at end of file
diff --git a/setup.cfg b/setup.cfg
index f24bd13cb064d8abc7881ac472575636adbd67e4..fbdd9d7119312e2831c77fe3e8b24bd16b5826b4 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = caoscrawler
-version = 0.3.1
+version = 0.4.0
 author = Alexander Schlemmer
 author_email = alexander.schlemmer@ds.mpg.de
 description = A new crawler for caosdb
diff --git a/src/doc/conf.py b/src/doc/conf.py
index 7d06ea9ac9597873ec9b4d7c389ee893530fdd2d..7719a920328c46b4453cd59413b939fcf2d45f5a 100644
--- a/src/doc/conf.py
+++ b/src/doc/conf.py
@@ -33,10 +33,10 @@ copyright = '2021, MPIDS'
 author = 'Alexander Schlemmer'
 
 # The short X.Y version
-version = '0.3.1'
+version = '0.4.0'
 # The full version, including alpha/beta/rc tags
 # release = '0.5.2-rc2'
-release = '0.3.1-dev'
+release = '0.4.0'
 
 
 # -- General configuration ---------------------------------------------------