diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
index 61ba013..e9a6854 100644
--- a/.github/workflows/codecov.yml
+++ b/.github/workflows/codecov.yml
@@ -13,7 +13,7 @@ jobs:
     - uses: actions/checkout@master
     - uses: actions/setup-go@v5
       with:
-          go-version: '1.20'
+          go-version: '1.21'
     - name: Run test coverage
       run: go test -race -coverprofile=coverage.out -covermode=atomic ./...
     - uses: codecov/codecov-action@v4
diff --git a/.github/workflows/gochecks.yml b/.github/workflows/gochecks.yml
index d8f40a4..c554fa9 100644
--- a/.github/workflows/gochecks.yml
+++ b/.github/workflows/gochecks.yml
@@ -16,7 +16,7 @@ jobs:
       - name: Setup Go environment
         uses: actions/setup-go@0c52d547c9bc32b1aa3301fd7a9cb496313a4491 # pin@v4
         with:
-          go-version: '1.20'
+          go-version: '1.21'
           check-latest: true
       - name: Run Vulncheck
         run: |
diff --git a/.github/workflows/releaser.yml b/.github/workflows/releaser.yml
index a3b2da1..9ce31d9 100644
--- a/.github/workflows/releaser.yml
+++ b/.github/workflows/releaser.yml
@@ -23,7 +23,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@0c52d547c9bc32b1aa3301fd7a9cb496313a4491 # pin@v4
         with:
-          go-version: '1.20'
+          go-version: '1.21'
           check-latest: true
       - name: Log in to Docker Hub
         uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # pin@v2
diff --git a/go.mod b/go.mod
index 2a39125..edeb3a1 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module fortio.org/slack-proxy
 
-go 1.20
+go 1.21
 
 require (
 	fortio.org/assert v1.2.0
diff --git a/go.sum b/go.sum
index a01a9fe..167f2c9 100644
--- a/go.sum
+++ b/go.sum
@@ -21,6 +21,7 @@ github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6r
 github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
 github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA=
 github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=