diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 978218dba2..dfb41b9152 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
       image: quay.io/prometheus/golang-builder:1.22-base
     steps:
       - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
-      - uses: prometheus/promci@3cb0c3871f223bd5ce1226995bd52ffb314798b6 # v0.1.0
+      - uses: prometheus/promci@c3c93a50d581b928af720f0134b2b2dad32a6c41 # v0.4.6
       - uses: ./.github/promci/actions/setup_environment
       - run: make GOOPTS=--tags=stringlabels GO_ONLY=1 SKIP_GOLANGCI_LINT=1
       - run: go test --tags=stringlabels ./tsdb/ -test.tsdb-isolation=false
@@ -28,7 +28,7 @@ jobs:
       image: quay.io/prometheus/golang-builder:1.22-base
     steps:
       - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
-      - uses: prometheus/promci@3cb0c3871f223bd5ce1226995bd52ffb314798b6 # v0.1.0
+      - uses: prometheus/promci@c3c93a50d581b928af720f0134b2b2dad32a6c41 # v0.4.6
       - uses: ./.github/promci/actions/setup_environment
       - run: go test --tags=dedupelabels ./...
       - run: GOARCH=386 go test ./cmd/prometheus
@@ -58,7 +58,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
-      - uses: prometheus/promci@3cb0c3871f223bd5ce1226995bd52ffb314798b6 # v0.1.0
+      - uses: prometheus/promci@c3c93a50d581b928af720f0134b2b2dad32a6c41 # v0.4.6
       - uses: ./.github/promci/actions/setup_environment
         with:
           enable_go: false
@@ -115,7 +115,7 @@ jobs:
         thread: [ 0, 1, 2 ]
     steps:
       - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
-      - uses: prometheus/promci@3cb0c3871f223bd5ce1226995bd52ffb314798b6 # v0.1.0
+      - uses: prometheus/promci@c3c93a50d581b928af720f0134b2b2dad32a6c41 # v0.4.6
       - uses: ./.github/promci/actions/build
         with:
           promu_opts: "-p linux/amd64 -p windows/amd64 -p linux/arm64 -p darwin/amd64 -p darwin/arm64 -p linux/386"
@@ -138,7 +138,7 @@ jobs:
     # should also be updated.
     steps:
       - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
-      - uses: prometheus/promci@3cb0c3871f223bd5ce1226995bd52ffb314798b6 # v0.1.0
+      - uses: prometheus/promci@c3c93a50d581b928af720f0134b2b2dad32a6c41 # v0.4.6
       - uses: ./.github/promci/actions/build
         with:
           parallelism: 12
@@ -188,7 +188,7 @@ jobs:
     if: github.event_name == 'push' && github.event.ref == 'refs/heads/main'
     steps:
       - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
-      - uses: prometheus/promci@3cb0c3871f223bd5ce1226995bd52ffb314798b6 # v0.1.0
+      - uses: prometheus/promci@c3c93a50d581b928af720f0134b2b2dad32a6c41 # v0.4.6
       - uses: ./.github/promci/actions/publish_main
         with:
           docker_hub_login: ${{ secrets.docker_hub_login }}
@@ -202,7 +202,7 @@ jobs:
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v2.')
     steps:
       - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
-      - uses: prometheus/promci@3cb0c3871f223bd5ce1226995bd52ffb314798b6 # v0.1.0
+      - uses: prometheus/promci@c3c93a50d581b928af720f0134b2b2dad32a6c41 # v0.4.6
       - uses: ./.github/promci/actions/publish_release
         with:
           docker_hub_login: ${{ secrets.docker_hub_login }}
@@ -217,13 +217,13 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
-      - uses: prometheus/promci@3cb0c3871f223bd5ce1226995bd52ffb314798b6 # v0.1.0
+      - uses: prometheus/promci@c3c93a50d581b928af720f0134b2b2dad32a6c41 # v0.4.6
       - name: Install nodejs
         uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
         with:
           node-version-file: "web/ui/.nvmrc"
           registry-url: "https://registry.npmjs.org"
-      - uses: actions/cache@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9 # v4.0.2
+      - uses: actions/cache@d4323d4df104b026a6aa633fdb11d772146be0bf # v4.2.2
         with:
           path: ~/.npm
           key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
diff --git a/config/config.go b/config/config.go
index 9defa10d48..ecf4d06dd5 100644
--- a/config/config.go
+++ b/config/config.go
@@ -139,6 +139,7 @@ var (
 	// DefaultConfig is the default top-level configuration.
 	DefaultConfig = Config{
 		GlobalConfig: DefaultGlobalConfig,
+		Runtime:      DefaultRuntimeConfig,
 	}
 
 	// DefaultGlobalConfig is the default global configuration.
diff --git a/config/config_test.go b/config/config_test.go
index ff056a2676..e3f4751ed8 100644
--- a/config/config_test.go
+++ b/config/config_test.go
@@ -2035,6 +2035,7 @@ func TestEmptyConfig(t *testing.T) {
 	require.NoError(t, err)
 	exp := DefaultConfig
 	require.Equal(t, exp, *c)
+	require.Equal(t, 75, c.Runtime.GoGC)
 }
 
 func TestExpandExternalLabels(t *testing.T) {
@@ -2086,7 +2087,6 @@ func TestEmptyGlobalBlock(t *testing.T) {
 	c, err := Load("global:\n", false, log.NewNopLogger())
 	require.NoError(t, err)
 	exp := DefaultConfig
-	exp.Runtime = DefaultRuntimeConfig
 	require.Equal(t, exp, *c)
 }