diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index af2acd5f1a79..643e5824a73d 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -32,7 +32,7 @@ jobs:
           node-version: 18
       - name: Node.js version
         id: node
-        run: echo "::set-output name=v8CppApiVersion::$(node --print "process.versions.modules")"
+        run: echo "v8CppApiVersion=$(node --print "process.versions.modules")" >> $GITHUB_OUTPUT
       - name: Restore dependencies
         uses: actions/cache@master
         id: cache-deps
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index b012f20cea54..06d48b14940c 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -16,7 +16,7 @@ jobs:
           node-version: 18
       - name: Node.js version
         id: node
-        run: echo "::set-output name=v8CppApiVersion::$(node --print "process.versions.modules")"
+        run: echo "v8CppApiVersion=$(node --print "process.versions.modules")" >> $GITHUB_OUTPUT
       - name: Restore dependencies
         uses: actions/cache@master
         id: cache-deps
diff --git a/.github/workflows/publish-dev.yml b/.github/workflows/publish-dev.yml
index ae640d79755d..2dc072ccb234 100644
--- a/.github/workflows/publish-dev.yml
+++ b/.github/workflows/publish-dev.yml
@@ -24,7 +24,7 @@ jobs:
           registry-url: "https://registry.npmjs.org"
       - name: Node.js version
         id: node
-        run: echo "::set-output name=v8CppApiVersion::$(node --print "process.versions.modules")"
+        run: echo "v8CppApiVersion=$(node --print "process.versions.modules")" >> $GITHUB_OUTPUT
       - name: Restore dependencies
         uses: actions/cache@master
         id: cache-deps
@@ -46,7 +46,7 @@ jobs:
           PACKAGE_VERSION=$(node -p "require('./packages/cli/package.json').version")
           NEXT_VERSION=$(npx --yes semver --increment minor $PACKAGE_VERSION)
           export VERSION=${NEXT_VERSION}-dev.${GITHUB_SHA:0:10}
-          echo "::set-output name=version::$VERSION"
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
           echo PACKAGE_VERSION $PACKAGE_VERSION GITHUB_SHA $GITHUB_SHA VERSION $VERSION
 
       - name: Change and commit version
diff --git a/.github/workflows/publish-rc.yml b/.github/workflows/publish-rc.yml
index 5d79111fea0c..462753d3e871 100644
--- a/.github/workflows/publish-rc.yml
+++ b/.github/workflows/publish-rc.yml
@@ -21,7 +21,7 @@ jobs:
 
       - name: Get tag
         id: get_tag
-        run: echo ::set-output name=tag::${GITHUB_REF/refs\/tags\//}
+        run: echo "tag=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_OUTPUT
 
       - name: Get previous tag
         id: get_prev_tag
@@ -57,7 +57,7 @@ jobs:
           node-version: 18
       - name: Node.js version
         id: node
-        run: echo "::set-output name=v8CppApiVersion::$(node --print "process.versions.modules")"
+        run: echo "v8CppApiVersion=$(node --print "process.versions.modules")" >> $GITHUB_OUTPUT
       - name: Restore dependencies
         uses: actions/cache@master
         id: cache-deps
diff --git a/.github/workflows/publish-stable.yml b/.github/workflows/publish-stable.yml
index 16a0ed126ea9..7047644b08ff 100644
--- a/.github/workflows/publish-stable.yml
+++ b/.github/workflows/publish-stable.yml
@@ -21,7 +21,7 @@ jobs:
 
       - name: Get tag
         id: get_tag
-        run: echo ::set-output name=tag::${GITHUB_REF/refs\/tags\//}
+        run: echo "tag=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_OUTPUT
 
       - name: Assert tag == package.json version
         run: .github/workflows/scripts/assert-same-package-version.sh
@@ -40,8 +40,8 @@ jobs:
         run: |
           STABLE_COMMIT=$(git log --pretty="%h" -n 1 refs/remotes/origin/stable)
           TAG_COMMIT=$(git log --pretty="%h" -n 1 $GITHUB_REF)
-          echo ::set-output name=stable_commit::$STABLE_COMMIT
-          echo ::set-output name=tag_commit::$TAG_COMMIT
+          echo "stable_commit=$STABLE_COMMIT" >> $GITHUB_OUTPUT
+          echo "tag_commit=$TAG_COMMIT" >> $GITHUB_OUTPUT
 
     outputs:
       is_stable: ${{ steps.release_type.outputs.stable_commit == steps.release_type.outputs.tag_commit }}
@@ -63,7 +63,7 @@ jobs:
           node-version: 18
       - name: Node.js version
         id: node
-        run: echo "::set-output name=v8CppApiVersion::$(node --print "process.versions.modules")"
+        run: echo "v8CppApiVersion=$(node --print "process.versions.modules")" >> $GITHUB_OUTPUT
       - name: Restore dependencies
         uses: actions/cache@master
         id: cache-deps
diff --git a/.github/workflows/test-browser.yml b/.github/workflows/test-browser.yml
index d60dfae76b66..16b69b406f48 100644
--- a/.github/workflows/test-browser.yml
+++ b/.github/workflows/test-browser.yml
@@ -1,8 +1,8 @@
 name: Browser tests
 
-on: 
+on:
   push:
-    # We intentionally don't run push on feature branches. See PR for rational. 
+    # We intentionally don't run push on feature branches. See PR for rational.
     branches: [unstable, stable]
   pull_request:
   workflow_dispatch:
@@ -26,7 +26,7 @@ jobs:
           node-version: ${{matrix.node}}
       - name: Node.js version
         id: node
-        run: echo "::set-output name=v8CppApiVersion::$(node --print "process.versions.modules")"
+        run: echo "v8CppApiVersion=$(node --print "process.versions.modules")" >> $GITHUB_OUTPUT
       - name: Restore dependencies
         uses: actions/cache@master
         id: cache-deps
diff --git a/.github/workflows/test-e2e.yml b/.github/workflows/test-e2e.yml
index 7150fbf114b7..7cd1a7ce5da9 100644
--- a/.github/workflows/test-e2e.yml
+++ b/.github/workflows/test-e2e.yml
@@ -1,8 +1,8 @@
 name: E2E tests
 
-on: 
+on:
   push:
-    # We intentionally don't run push on feature branches. See PR for rational. 
+    # We intentionally don't run push on feature branches. See PR for rational.
     branches: [unstable, stable]
   pull_request:
   workflow_dispatch:
@@ -26,7 +26,7 @@ jobs:
           node-version: ${{matrix.node}}
       - name: Node.js version
         id: node
-        run: echo "::set-output name=v8CppApiVersion::$(node --print "process.versions.modules")"
+        run: echo "v8CppApiVersion=$(node --print "process.versions.modules")" >> $GITHUB_OUTPUT
       - name: Restore dependencies
         uses: actions/cache@master
         id: cache-deps
diff --git a/.github/workflows/test-sim-merge.yml b/.github/workflows/test-sim-merge.yml
index 31532d2c6b1a..a5cd4dbae7f9 100644
--- a/.github/workflows/test-sim-merge.yml
+++ b/.github/workflows/test-sim-merge.yml
@@ -1,8 +1,8 @@
 name: Sim merge execution/builder tests
 
-on: 
+on:
   push:
-    # We intentionally don't run push on feature branches. See PR for rational. 
+    # We intentionally don't run push on feature branches. See PR for rational.
     branches: [unstable, stable]
   pull_request:
   workflow_dispatch:
@@ -27,7 +27,7 @@ jobs:
           node-version: 18
       - name: Node.js version
         id: node
-        run: echo "::set-output name=v8CppApiVersion::$(node --print "process.versions.modules")"
+        run: echo "v8CppApiVersion=$(node --print "process.versions.modules")" >> $GITHUB_OUTPUT
       - name: Restore dependencies
         uses: actions/cache@master
         id: cache-deps
@@ -89,7 +89,7 @@ jobs:
           name: debug-test-logs
           path: packages/beacon-node/test-logs
 
-      - name: Pull geth withdrawals 
+      - name: Pull geth withdrawals
         run: docker pull $GETH_WITHDRAWALS_IMAGE
 
       - name: Test Lodestar <> geth withdrawals
@@ -99,7 +99,7 @@ jobs:
           EL_BINARY_DIR: ${{ env.GETH_WITHDRAWALS_IMAGE }}
           EL_SCRIPT_DIR: gethdocker
 
-      - name: Pull ethereumjs withdrawals 
+      - name: Pull ethereumjs withdrawals
         run: docker pull $ETHEREUMJS_WITHDRAWALS_IMAGE
 
       - name: Test Lodestar <> ethereumjs withdrawals
diff --git a/.github/workflows/test-sim.yml b/.github/workflows/test-sim.yml
index 9bba2a0cfb2d..a5cae2cb5440 100644
--- a/.github/workflows/test-sim.yml
+++ b/.github/workflows/test-sim.yml
@@ -23,7 +23,7 @@ jobs:
           node-version: 18
       - name: Node.js version
         id: node
-        run: echo "::set-output name=v8CppApiVersion::$(node --print "process.versions.modules")"
+        run: echo "v8CppApiVersion=$(node --print "process.versions.modules")" >> $GITHUB_OUTPUT
       - name: Restore dependencies
         uses: actions/cache@master
         id: cache-deps
diff --git a/.github/workflows/test-spec.yml b/.github/workflows/test-spec.yml
index 80d3331b7109..24f8d0aa7890 100644
--- a/.github/workflows/test-spec.yml
+++ b/.github/workflows/test-spec.yml
@@ -22,7 +22,7 @@ jobs:
           node-version: 18
       - name: Node.js version
         id: node
-        run: echo "::set-output name=v8CppApiVersion::$(node --print "process.versions.modules")"
+        run: echo "v8CppApiVersion=$(node --print "process.versions.modules")" >> $GITHUB_OUTPUT
       - name: Restore dependencies
         uses: actions/cache@master
         id: cache-deps
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7927ce9fb17f..405463e2f751 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -23,7 +23,7 @@ jobs:
           node-version: ${{matrix.node}}
       - name: Node.js version
         id: node
-        run: echo "::set-output name=v8CppApiVersion::$(node --print "process.versions.modules")"
+        run: echo "v8CppApiVersion=$(node --print "process.versions.modules")" >> $GITHUB_OUTPUT
       - name: Restore dependencies
         uses: actions/cache@master
         id: cache-deps
diff --git a/scripts/release/assert_valid_rc.mjs b/scripts/release/assert_valid_rc.mjs
deleted file mode 100644
index dc1141c9f9a3..000000000000
--- a/scripts/release/assert_valid_rc.mjs
+++ /dev/null
@@ -1,44 +0,0 @@
-/* eslint-disable
-  no-console,
-  @typescript-eslint/no-unsafe-assignment,
-  @typescript-eslint/no-unsafe-member-access,
-  @typescript-eslint/no-unsafe-call,
-  import/no-extraneous-dependencies 
-*/
-
-import semver from "semver";
-
-import {assertCommitExistsInBranch} from "./utils.mjs";
-
-// Asserts whether a tag is a valid release candidate or not
-// This script is meant to be run by a github workflow
-// The output of this script is to either set github variables or not
-
-const tag = process.env.TAG;
-const commit = tag;
-
-console.log("Tag:", tag);
-
-// assert it matches proper format vX.X.X-rc.X
-const version = semver.parse(tag);
-if (!version) {
-  console.log("Invalid tag: unparseable version");
-  process.exit();
-}
-if (version.prerelease.length !== 2 && version.prerelease[0] !== "rc" && !Number.isInteger(version.prerelease[1])) {
-  console.log("Invalid tag: not a valid rc version");
-  process.exit();
-}
-
-// assert it exists in branch rc/vX.X.X
-const rcBranch = `rc/v${version.major}.${version.minor}.${version.patch}`;
-try {
-  assertCommitExistsInBranch(commit, rcBranch);
-} catch (e) {
-  console.log("Invalid commit: does not exist in rc branch", rcBranch);
-  process.exit();
-}
-
-// success
-console.log("::set-output name=is_rc::true");
-console.log(`::set-output name=version::${version.version}`);
diff --git a/scripts/release/assert_valid_rc.sh b/scripts/release/assert_valid_rc.sh
index f1e435f1d9e1..837af22b61a8 100755
--- a/scripts/release/assert_valid_rc.sh
+++ b/scripts/release/assert_valid_rc.sh
@@ -24,5 +24,5 @@ HEAD_COMMIT=$(git rev-parse refs/remotes/origin/$RC_BRANCH)
 git merge-base --is-ancestor $COMMIT $HEAD_COMMIT
 
 # success
-echo "::set-output name=is_rc::true"
-echo "::set-output name=version::$VERSION"
+echo "is_rc=true" >> $GITHUB_OUTPUT
+echo "version=$VERSION" >> $GITHUB_OUTPUT