diff --git a/CHANGELOG.md b/CHANGELOG.md
index d73a435f..bd35f563 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 0.51.1 (2023-07-13)
+
+* Bump github.com/mackerelio/mackerel-agent from 0.75.1 to 0.77.0 #576 (dependabot[bot])
+
+
 ## 0.51.0 (2023-05-31)
 
 * Bump github.com/mackerelio/mackerel-client-go from 0.25.0 to 0.26.0 #568 (dependabot[bot])
diff --git a/Makefile b/Makefile
index 57c1884b..3c9f38b1 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 BIN := mkr
-VERSION := 0.51.0
+VERSION := 0.51.1
 CURRENT_REVISION := $(shell git rev-parse --short HEAD)
 BUILD_LDFLAGS := "-w -s -X main.gitcommit=$(CURRENT_REVISION)"
 
diff --git a/packaging/deb-v2/debian/changelog b/packaging/deb-v2/debian/changelog
index c2db5dee..081d57e1 100644
--- a/packaging/deb-v2/debian/changelog
+++ b/packaging/deb-v2/debian/changelog
@@ -1,3 +1,10 @@
+mkr (0.51.1-1.v2) stable; urgency=low
+
+  * Bump github.com/mackerelio/mackerel-agent from 0.75.1 to 0.77.0 (by dependabot[bot])
+    <https://github.com/mackerelio/mkr/pull/576>
+
+ -- mackerel <mackerel-developers@hatena.ne.jp>  Thu, 13 Jul 2023 06:30:21 +0000
+
 mkr (0.51.0-1.v2) stable; urgency=low
 
   * Bump github.com/mackerelio/mackerel-client-go from 0.25.0 to 0.26.0 (by dependabot[bot])
diff --git a/packaging/mkr_0.51.0.orig.tar.gz b/packaging/mkr_0.51.1.orig.tar.gz
similarity index 100%
rename from packaging/mkr_0.51.0.orig.tar.gz
rename to packaging/mkr_0.51.1.orig.tar.gz
diff --git a/packaging/rpm/mkr-v2.spec b/packaging/rpm/mkr-v2.spec
index c729dc10..f87968f6 100644
--- a/packaging/rpm/mkr-v2.spec
+++ b/packaging/rpm/mkr-v2.spec
@@ -35,6 +35,9 @@ rm -f %{buildroot}%{_bindir}/%{name}
 %{_bindir}/%{name}
 
 %changelog
+* Thu Jul 13 2023 <mackerel-developers@hatena.ne.jp> - 0.51.1
+- Bump github.com/mackerelio/mackerel-agent from 0.75.1 to 0.77.0 (by dependabot[bot])
+
 * Wed May 31 2023 <mackerel-developers@hatena.ne.jp> - 0.51.0
 - Bump github.com/mackerelio/mackerel-client-go from 0.25.0 to 0.26.0 (by dependabot[bot])
 
diff --git a/packaging/rpm/mkr.spec b/packaging/rpm/mkr.spec
index 44a727c2..64ed69c5 100644
--- a/packaging/rpm/mkr.spec
+++ b/packaging/rpm/mkr.spec
@@ -41,6 +41,9 @@ rm -f %{buildroot}%{_bindir}/${name}
 %{_localbindir}/%{name}
 
 %changelog
+* Thu Jul 13 2023 <mackerel-developers@hatena.ne.jp> - 0.51.1
+- Bump github.com/mackerelio/mackerel-agent from 0.75.1 to 0.77.0 (by dependabot[bot])
+
 * Wed May 31 2023 <mackerel-developers@hatena.ne.jp> - 0.51.0
 - Bump github.com/mackerelio/mackerel-client-go from 0.25.0 to 0.26.0 (by dependabot[bot])
 
diff --git a/version.go b/version.go
index 4812efc4..8bf1f944 100644
--- a/version.go
+++ b/version.go
@@ -1,5 +1,5 @@
 package main
 
-const version = "0.51.0"
+const version = "0.51.1"
 
 var gitcommit string