diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4c27146..f5c99bb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ env:
 jobs:
   build:
     name: build
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -45,7 +45,7 @@ jobs:
 
   check:
     name: check
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     needs: build
     steps:
       - name: Checkout
@@ -97,10 +97,19 @@ jobs:
           image: ${{ github.repository }}:${{ env.GITHUB_SHA_SHORT }}
           run: mage fmt:lint
 
+      - uses: addnab/docker-run-action@v2
+        # Run an image built by a previous step.
+        # https://github.com/addnab/docker-run-action
+        # https://github.com/marketplace/actions/docker-run-action
+        name: Run dependencies check
+        with:
+          image: ${{ github.repository }}:${{ env.GITHUB_SHA_SHORT }}
+          run: mage deps:check
+
   test:
     name: test
     needs: [build, check]
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4
diff --git a/.github/workflows/pr-check.yml b/.github/workflows/pr-check.yml
index bf437e9..02e7038 100644
--- a/.github/workflows/pr-check.yml
+++ b/.github/workflows/pr-check.yml
@@ -10,7 +10,7 @@ on:
 jobs:
   check-commit-message:
     name: Check Commit Message
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Check Commit Message
         uses: gsactions/commit-message-checker@v2
diff --git a/Dockerfile b/Dockerfile
index 7c8bdfb..132fb65 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,7 +15,7 @@ RUN apk add --no-cache \
 	tzdata
 
 COPY ./go.mod ./go.sum ./
-RUN go mod download
+RUN go mod download && go mod verify
 
 COPY . .
 
diff --git a/magefile.go b/magefile.go
index 8ca9e01..972c471 100644
--- a/magefile.go
+++ b/magefile.go
@@ -69,3 +69,10 @@ func (Fmt) Lint() error {
 	lintCmd := "golangci-lint"
 	return sh.RunV(lintCmd, "run")
 }
+
+type Deps mg.Namespace
+
+// Checks the dependencies.
+func (Deps) Check() error {
+	return sh.RunV(mg.GoCmd(), "mod", "tidy", "-diff")
+}