diff --git a/CMakeLists.txt b/CMakeLists.txt
index aaaad2d..47d53aa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,7 +10,7 @@ if( DEFINED PROJECT_NAME )
 endif()
 
 project( tools
-  VERSION 0.5.0
+  VERSION 0.4.1
   LANGUAGES CXX
 )
 
diff --git a/ReleaseNotes.md b/ReleaseNotes.md
index 216954e..a2794d6 100644
--- a/ReleaseNotes.md
+++ b/ReleaseNotes.md
@@ -1,7 +1,10 @@
 # Release Notes—tools
 Given here are some release notes for tools.
 
-## [tools v0.5.0](https://github.com/njoy/tools/pull/xx)
+## tools v0.4.1
+Bug fixes:
+  - iterator guards were added to the disco parser to avoid valgrind errors in ENDFtk.
+  - the stride_view iterator was missing the reference type, which is required to create vectors using these stride view iterators in C++17.
 
 ## [tools v0.4.0](https://github.com/njoy/tools/pull/44)
 New features: