diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index daafde6..21e011e 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -8,7 +8,7 @@ on:
 
 env:
   # renovate: datasource=golang-version depName=golang
-  GO_VERSION: '1.26.5'
+  GO_VERSION: '1.26.6'
 
 jobs:
 
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index c9f0aff..32e0805 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -7,7 +7,7 @@ on:
 
 env:
   # renovate: datasource=golang-version depName=golang
-  GO_VERSION: '1.26.5'
+  GO_VERSION: '1.26.6'
 
 jobs:
   build:
diff --git a/go.mod b/go.mod
index 6b9704a..8f9f912 100644
--- a/go.mod
+++ b/go.mod
@@ -2,7 +2,7 @@ module github.com/nabeken/go-github-apps
 
 go 1.25.0
 
-toolchain go1.26.5
+toolchain go1.26.6
 
 require (
 	github.com/bradleyfalzon/ghinstallation/v2 v2.19.0