diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7c53774c2..ed5983bb7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 0.78.2 (2023-12-01)
+
+* Avoid iowait percentage's overflow when counter is reset #947 (Arthur1)
+
+
 ## 0.78.1 (2023-11-15)
 
 * Bump github.com/mackerelio/go-check-plugins from 0.45.0 to 0.46.1 in /wix #945 (dependabot[bot])
diff --git a/Makefile b/Makefile
index 330887435..1813f1e09 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 MACKEREL_AGENT_NAME ?= "mackerel-agent"
 MACKEREL_API_BASE ?= "https://api.mackerelio.com"
-VERSION := 0.78.1
+VERSION := 0.78.2
 CURRENT_REVISION := $(shell git rev-parse --short HEAD)
 ARGS := "-conf=mackerel-agent.conf"
 BUILD_OS_TARGETS := "linux darwin freebsd windows netbsd"
diff --git a/packaging/deb-systemd/debian/changelog b/packaging/deb-systemd/debian/changelog
index e1ac169ac..eb2ec2e21 100644
--- a/packaging/deb-systemd/debian/changelog
+++ b/packaging/deb-systemd/debian/changelog
@@ -1,3 +1,10 @@
+mackerel-agent (0.78.2-1.systemd) stable; urgency=low
+
+  * Avoid iowait percentage's overflow when counter is reset (by Arthur1)
+    <https://github.com/mackerelio/mackerel-agent/pull/947>
+
+ -- mackerel <mackerel-developers@hatena.ne.jp>  Fri, 1 Dec 2023 03:10:29 +0000
+
 mackerel-agent (0.78.1-1.systemd) stable; urgency=low
 
   * Bump github.com/mackerelio/go-check-plugins from 0.45.0 to 0.46.1 in /wix (by dependabot[bot])
diff --git a/packaging/rpm/mackerel-agent-systemd.spec b/packaging/rpm/mackerel-agent-systemd.spec
index f4c9ccd1c..f7eae91f4 100644
--- a/packaging/rpm/mackerel-agent-systemd.spec
+++ b/packaging/rpm/mackerel-agent-systemd.spec
@@ -54,6 +54,9 @@ systemctl enable %{name}.service
 %config(noreplace) %{_sysconfdir}/%{name}/%{name}.conf
 
 %changelog
+* Fri Dec 1 2023 <mackerel-developers@hatena.ne.jp> - 0.78.2
+- Avoid iowait percentage's overflow when counter is reset (by Arthur1)
+
 * Wed Nov 15 2023 <mackerel-developers@hatena.ne.jp> - 0.78.1
 - Bump github.com/mackerelio/go-check-plugins from 0.45.0 to 0.46.1 in /wix (by dependabot[bot])
 - Bump golang.org/x/sys from 0.12.0 to 0.14.0 in /wix (by dependabot[bot])
diff --git a/version.go b/version.go
index 7b5d19c9c..16a5cdd44 100644
--- a/version.go
+++ b/version.go
@@ -1,5 +1,5 @@
 package main
 
-const version = "0.78.1"
+const version = "0.78.2"
 
 var gitcommit string