diff --git a/.github/workflows/auto-merge.yml b/.github/workflows/auto-merge.yml
index 8fa29af8f..9ee94a7ad 100644
--- a/.github/workflows/auto-merge.yml
+++ b/.github/workflows/auto-merge.yml
@@ -11,7 +11,9 @@ jobs:
     # Apply this job if it is a PR and by OWNER with '/approve' comment
     # TODO: the section contains('seokho-son jihoon-seo hermitkim1') needs to be updated or automated
     if: ${{ github.event.issue.pull_request && (contains('seokho-son jihoon-seo hermitkim1', github.event.comment.user.login) || github.event.comment.author_association == 'OWNER') && startsWith(github.event.comment.body, '/approve') }}
-    runs-on: ubuntu-18.04
+    # This job runs on Ubuntu-latest (Ubuntu 20.04 LTS checked on 2022-09-06)
+    # See https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners
+    runs-on: ubuntu-latest
     steps:
       # Check author_association is OWNER
       - name: Check author_association
diff --git a/.github/workflows/build-amd64-container-image.yaml b/.github/workflows/build-amd64-container-image.yaml
index 74e1cf81c..3c8ae0d6c 100644
--- a/.github/workflows/build-amd64-container-image.yaml
+++ b/.github/workflows/build-amd64-container-image.yaml
@@ -23,8 +23,9 @@ jobs:
     # Job name is "Building"
     name: Building
 
-    # This job runs on Ubuntu-latest
-    runs-on: ubuntu-18.04
+    # This job runs on Ubuntu-latest (Ubuntu 20.04 LTS checked on 2022-09-06)
+    # See https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners
+    runs-on: ubuntu-latest
     if: ${{ !contains(github.event.head_commit.message, '[skip ci]') }}
 
     steps:
diff --git a/.github/workflows/make-swagger.yaml b/.github/workflows/make-swagger.yaml
index e2626fb0c..8675decd1 100644
--- a/.github/workflows/make-swagger.yaml
+++ b/.github/workflows/make-swagger.yaml
@@ -10,10 +10,12 @@ jobs:
   update-swagger-doc:
     name: Update Swagger doc
     if: github.repository == 'cloud-barista/cb-tumblebug'
-    runs-on: ubuntu-18.04
+    # This job runs on Ubuntu-latest (Ubuntu 20.04 LTS checked on 2022-09-06)
+    # See https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners
+    runs-on: ubuntu-latest
     strategy:
       matrix:
-        go-version: [ '1.17' ]
+        go-version: [ '1.19' ]
 
     steps:
       - name: Set up Go ${{ matrix.go-version }}
diff --git a/.github/workflows/prow-commands.yml b/.github/workflows/prow-commands.yml
index 647848245..437fabb4c 100644
--- a/.github/workflows/prow-commands.yml
+++ b/.github/workflows/prow-commands.yml
@@ -12,7 +12,9 @@ jobs:
   execute:
     # Execute when author_association of the comment is OWNER or MEMBER
     if: ${{ github.event.comment.author_association == 'OWNER' || github.event.comment.author_association == 'MEMBER' }}
-    runs-on: ubuntu-18.04
+    # This job runs on Ubuntu-latest (Ubuntu 20.04 LTS checked on 2022-09-06)
+    # See https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners
+    runs-on: ubuntu-latest
     # Execute action according to commands
     steps:
       # Check author_association
diff --git a/.github/workflows/publish-multi-arch-container-images.yaml b/.github/workflows/publish-multi-arch-container-images.yaml
index c028477e2..39087967f 100644
--- a/.github/workflows/publish-multi-arch-container-images.yaml
+++ b/.github/workflows/publish-multi-arch-container-images.yaml
@@ -33,8 +33,9 @@ jobs:
 
     if: github.repository == 'cloud-barista/cb-tumblebug'
 
-    # This job runs on Ubuntu-latest
-    runs-on: ubuntu-18.04
+    # This job runs on Ubuntu-latest (Ubuntu 20.04 LTS checked on 2022-09-06)
+    # See https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners
+    runs-on: ubuntu-latest
 
     steps:
       - name: Checkout source code