diff --git a/.cursor/rules/development.mdc b/.cursor/rules/development.mdc
index 3f447133bc..6a03d7465f 100644
--- a/.cursor/rules/development.mdc
+++ b/.cursor/rules/development.mdc
@@ -15,7 +15,7 @@ alwaysApply: true
   - Tooling packages (development tools)
 
 ## Build Requirements
-- Node environment version 16 required, this is a minimum.
+- Node environment version 20 required, this is a minimum.
 - yarn required
 - Some projects may have specific environment prerequisites
 
diff --git a/.github/workflows/browser.yml b/.github/workflows/browser.yml
index 2ace6ddf56..05c0ea02cf 100644
--- a/.github/workflows/browser.yml
+++ b/.github/workflows/browser.yml
@@ -19,7 +19,7 @@ jobs:
     strategy:
       matrix:
         # Node versions to run on.
-        version: [18, 21]
+        version: [20, 22]
 
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
@@ -34,7 +34,7 @@ jobs:
           workspace_name: '@launchdarkly/js-client-sdk'
           workspace_path: packages/sdk/browser
       - name: Check package size
-        if: github.event_name == 'pull_request' && matrix.version == '21'
+        if: github.event_name == 'pull_request' && matrix.version == '22'
         uses: ./actions/package-size
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/combined-browser.yml b/.github/workflows/combined-browser.yml
index defde3410c..2953c4ac36 100644
--- a/.github/workflows/combined-browser.yml
+++ b/.github/workflows/combined-browser.yml
@@ -19,7 +19,7 @@ jobs:
     strategy:
       matrix:
         # Node versions to run on.
-        version: [18, 21]
+        version: [20, 22]
 
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
@@ -34,7 +34,7 @@ jobs:
           workspace_name: '@launchdarkly/browser'
           workspace_path: packages/sdk/combined-browser
       - name: Check package size
-        if: github.event_name == 'pull_request' && matrix.version == '21'
+        if: github.event_name == 'pull_request' && matrix.version == '22'
         uses: ./actions/package-size
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/server-node.yml b/.github/workflows/server-node.yml
index 3aa4f73ffc..89d7a2cf98 100644
--- a/.github/workflows/server-node.yml
+++ b/.github/workflows/server-node.yml
@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix:
         # Node versions to run on.
-        version: [18, 22]
+        version: [20, 22]
 
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
diff --git a/CLAUDE.md b/CLAUDE.md
index 130e271593..a11a5283e8 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -10,7 +10,7 @@
   - Tooling packages (development tools)
 
 ## Build Requirements
-- Node environment version 16 required (minimum)
+- Node environment version 20 required (minimum)
 - yarn required
 - Some projects may have specific environment prerequisites
 
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 5307a97840..d53a157c19 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -14,7 +14,7 @@ We encourage pull requests and other contributions from the community. Before su
 
 ### Prerequisites
 
-A node environment of version 16 and npm or yarn are required to develop in this repository.
+A node environment of version 20 and npm or yarn are required to develop in this repository.
 
 This monorepo may contain projects that are not suitable for execution using node, and those
 projects will have specific environment prerequisites.