diff --git a/act/runner/runner_test.go b/act/runner/runner_test.go
index b87d71b5..4199e19e 100644
--- a/act/runner/runner_test.go
+++ b/act/runner/runner_test.go
@@ -74,7 +74,7 @@ func TestRunEvent(t *testing.T) {
 	}
 
 	platforms := map[string]string{
-		"ubuntu-latest": "node:12.6-buster-slim",
+		"ubuntu-latest": "node:12.20.1-buster-slim",
 	}
 	tables := []TestJobFileInfo{
 		{"testdata", "basic", "push", "", platforms},
@@ -113,7 +113,7 @@ func TestRunEventSecrets(t *testing.T) {
 	ctx := context.Background()
 
 	platforms := map[string]string{
-		"ubuntu-latest": "node:12.6-buster-slim",
+		"ubuntu-latest": "node:12.20.1-buster-slim",
 	}
 
 	workflowPath := "secrets"
@@ -154,7 +154,7 @@ func TestRunEventPullRequest(t *testing.T) {
 	ctx := context.Background()
 
 	platforms := map[string]string{
-		"ubuntu-latest": "node:12.6-buster-slim",
+		"ubuntu-latest": "node:12.20.1-buster-slim",
 	}
 
 	workflowPath := "pull-request"
diff --git a/act/runner/step_context_test.go b/act/runner/step_context_test.go
index fa5f7228..527da675 100644
--- a/act/runner/step_context_test.go
+++ b/act/runner/step_context_test.go
@@ -9,7 +9,7 @@ import (
 
 func TestStepContextExecutor(t *testing.T) {
 	platforms := map[string]string{
-		"ubuntu-latest": "node:12.6-buster-slim",
+		"ubuntu-latest": "node:12.20.1-buster-slim",
 	}
 	tables := []TestJobFileInfo{
 		{"testdata", "uses-github-empty", "push", "Expected format {org}/{repo}[/path]@ref", platforms},
diff --git a/act/runner/testdata/actions/docker-local/Dockerfile b/act/runner/testdata/actions/docker-local/Dockerfile
index fa0188ae..62051498 100644
--- a/act/runner/testdata/actions/docker-local/Dockerfile
+++ b/act/runner/testdata/actions/docker-local/Dockerfile
@@ -1,5 +1,5 @@
 # Container image that runs your code
-FROM alpine:3.10
+FROM alpine:3.13
 
 # Copies your code file from your action repository to the filesystem path `/` of the container
 COPY entrypoint.sh /entrypoint.sh
diff --git a/act/runner/testdata/actions/docker-url/action.yml b/act/runner/testdata/actions/docker-url/action.yml
index d5e5e56f..70434cb5 100644
--- a/act/runner/testdata/actions/docker-url/action.yml
+++ b/act/runner/testdata/actions/docker-url/action.yml
@@ -8,7 +8,7 @@ inputs:
     default: World
 runs:
   using: docker
-  #image: docker://alpine:3.8
+  #image: docker://alpine:3.13
   image: docker://node:12-alpine
   env:
     TEST: enabled
diff --git a/act/runner/testdata/basic/push.yml b/act/runner/testdata/basic/push.yml
index 22d3076c..898517f6 100644
--- a/act/runner/testdata/basic/push.yml
+++ b/act/runner/testdata/basic/push.yml
@@ -10,7 +10,7 @@ jobs:
     steps:
       - run: echo ${{ env.TEST }} | grep value
       - run: env
-      - uses: docker://alpine:3.8
+      - uses: docker://alpine:3.13
         with:
           somekey: ${{ env.TEST }}
           args: echo ${INPUT_SOMEKEY} | grep somevalue
diff --git a/act/runner/testdata/fail/push.yml b/act/runner/testdata/fail/push.yml
index c33e27ff..892df606 100644
--- a/act/runner/testdata/fail/push.yml
+++ b/act/runner/testdata/fail/push.yml
@@ -5,7 +5,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     container: 
-      image: node:10.16-jessie
+      image: node:12.20.1-buster
       env:
         TEST_ENV: test-value
     steps:
diff --git a/act/runner/testdata/job-container/push.yml b/act/runner/testdata/job-container/push.yml
index f4eab3df..1d25750f 100644
--- a/act/runner/testdata/job-container/push.yml
+++ b/act/runner/testdata/job-container/push.yml
@@ -5,7 +5,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     container: 
-      image: node:10.16-jessie
+      image: node:12.20.1-buster
       env:
         TEST_ENV: test-value
     steps:
@@ -13,7 +13,7 @@ jobs:
 
   test2:
     runs-on: ubuntu-latest
-    container: node:10.16-jessie
+    container: node:12.20.1-buster
     steps:
       - run: echo ${TEST_ENV} | grep test-value
         env:
diff --git a/act/runner/testdata/uses-docker-url/push.yml b/act/runner/testdata/uses-docker-url/push.yml
index 204a0e0d..e5020964 100644
--- a/act/runner/testdata/uses-docker-url/push.yml
+++ b/act/runner/testdata/uses-docker-url/push.yml
@@ -5,7 +5,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-    - uses: docker://alpine:3.8
+    - uses: docker://alpine:3.13
       with:
         somekey: somevalue
         args: echo ${INPUT_SOMEKEY} | grep somevalue
diff --git a/cmd/platforms.go b/cmd/platforms.go
index 4be7896b..a6a23590 100644
--- a/cmd/platforms.go
+++ b/cmd/platforms.go
@@ -6,10 +6,10 @@ import (
 
 func (i *Input) newPlatforms() map[string]string {
 	platforms := map[string]string{
-		"ubuntu-latest":  "node:12.6-buster-slim",
-		"ubuntu-20.04":   "node:12.6-buster-slim",
-		"ubuntu-18.04":   "node:12.6-buster-slim",
-		"ubuntu-16.04":   "node:12.6-stretch-slim",
+		"ubuntu-latest":  "node:12.20.1-buster-slim",
+		"ubuntu-20.04":   "node:12.20.1-buster-slim",
+		"ubuntu-18.04":   "node:12.20.1-buster-slim",
+		"ubuntu-16.04":   "node:12.20.1-stretch-slim",
 		"windows-latest": "",
 		"windows-2019":   "",
 		"macos-latest":   "",
diff --git a/cmd/root.go b/cmd/root.go
index eb8174a3..2a9a80c4 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -220,7 +220,7 @@ func newRunCommand(ctx context.Context, input *Input) func(*cobra.Command, []str
 				case "Medium":
 					option = "-P ubuntu-latest=catthehacker/ubuntu:act-latest\n-P ubuntu-20.04=catthehacker/ubuntu:act-20.04\n-P ubuntu-18.04=catthehacker/ubuntu:act-18.04\nubuntu-16.04=catthehacker/ubuntu:act-16.04"
 				case "Micro":
-					option = "-P ubuntu-latest=node:12.6-buster-slim\n-P ubuntu-20.04=node:12.6-buster-slim\n-P ubuntu-18.04=node:12.6-buster-slim\n-P ubuntu-16.04=node:12.6-stretch-slim"
+					option = "-P ubuntu-latest=node:12.20.1-buster-slim\n-P ubuntu-20.04=node:12.20.1-buster-slim\n-P ubuntu-18.04=node:12.20.1-buster-slim\n-P ubuntu-16.04=node:12.20.1-stretch-slim"
 				}
 
 				f, err := os.Create(actrc[0])