diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 804906eb..13486356 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest ] #, macos-latest, windows-latest ]
-        node-version: [ '18' ]
+        node-version: [ '20' ]
 
     name: Node.js ${{ matrix.node-version }} on OS ${{ matrix.os }}
     steps:
diff --git a/bootstrap.sh b/bootstrap.sh
index 2f60eef4..8d97e0e9 100644
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -1,8 +1,8 @@
 #!/bin/sh
 
 # Install Node.js sandbox.
-export NODEJS_VERSION=18.12.1
-export NPM_VERSION=8.19.3
+export NODEJS_VERSION=20.11.0
+export NPM_VERSION=10.3.0
 source /dev/stdin <<<"$(curl -s https://raw.githubusercontent.com/cicerops/supernode/main/supernode)"
 
 # Install dependencies.