diff --git a/CHANGELOG.md b/CHANGELOG.md
index f8c4fc2..f85ba78 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## [v0.0.20](https://github.com/monitoring-forge/mackerel-plugin-linux-process-status/compare/v0.0.19...v0.0.20) - 2026-08-16
+
+- Makefile and go.mod: update flagrun dependency to v0.0.6; refactor er… by @kazeburo in https://github.com/monitoring-forge/mackerel-plugin-linux-process-status/pull/33
+- Refactor error handling and message printing by @kazeburo in https://github.com/monitoring-forge/mackerel-plugin-linux-process-status/pull/35
+
 ## [v0.0.19](https://github.com/monitoring-forge/mackerel-plugin-linux-process-status/compare/v0.0.18...v0.0.19) - 2026-08-14
 
 - Fix/use flagrun by @kazeburo in https://github.com/monitoring-forge/mackerel-plugin-linux-process-status/pull/31
diff --git a/Makefile b/Makefile
index 585787c..32bb697 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-VERSION=0.0.19
+VERSION=0.0.20
 LDFLAGS=-ldflags "-w -s -X main.version=${VERSION}"
 all: mackerel-plugin-linux-process-status