diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 4a26afa..2a77a5e 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "3.1.0"
+  ".": "3.1.1"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c684fb1..6e565aa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [3.1.1](https://github.com/embedded-pro/numerical-toolbox-cpp/compare/v3.1.0...v3.1.1) (2026-08-16)
+
+
+### Bug Fixes
+
+* Use scale-invariant convergence tolerance in DARE solver ([#288](https://github.com/embedded-pro/numerical-toolbox-cpp/issues/288)) ([#289](https://github.com/embedded-pro/numerical-toolbox-cpp/issues/289)) ([7524ab1](https://github.com/embedded-pro/numerical-toolbox-cpp/commit/7524ab123cee292cc5d02c760b62422e82b46f45))
+
 ## [3.1.0](https://github.com/embedded-pro/numerical-toolbox-cpp/compare/v3.0.0...v3.1.0) (2026-08-14)
 
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 837f0ce..49287eb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -59,7 +59,7 @@ if (NUMERICAL_TOOLBOX_STANDALONE)
     endif()
 endif()
 
-project(numerical-toolbox LANGUAGES C CXX ASM VERSION 3.1.0) # x-release-please-version
+project(numerical-toolbox LANGUAGES C CXX ASM VERSION 3.1.1) # x-release-please-version
 
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED On)