diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 6838160..bc1abd4 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -15,7 +15,6 @@ jobs:
     strategy:
       matrix:
         base_image:
-          - "ubuntu:20.04"
           - "ubuntu:22.04"
           - "ubuntu:24.04"
 
diff --git a/AGENTS.md b/AGENTS.md
index 4077689..bd66cd3 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -2,9 +2,9 @@
 
 ## Project Overview
 
-Ubuntu Server Bootstrap is an opinionated bash script for provisioning Ubuntu 18+ servers with development and DevOps tools. It installs Docker CE, Docker Compose v2, Zsh with Prezto, and a curated set of CLI tools (ripgrep, fd, fzf, ag, tig, htop, byobu, neovim, etc.).
+Ubuntu Server Bootstrap is an opinionated bash script for provisioning Ubuntu 22+ servers with development and DevOps tools. It installs Docker CE, Docker Compose v2, Zsh with Prezto, and a curated set of CLI tools (ripgrep, fd, fzf, ag, tig, htop, byobu, neovim, etc.).
 
-**Supported Ubuntu LTS versions:** 20.04, 22.04, 24.04 (x86_64 only)
+**Supported Ubuntu LTS versions:** 22.04, 24.04 (x86_64 only)
 
 ## Project Structure
 
@@ -12,7 +12,7 @@ Ubuntu Server Bootstrap is an opinionated bash script for provisioning Ubuntu 18
 bootstrap.sh       # Main provisioning script (~393 lines)
 run-tests.sh       # Test runner - builds Docker images per Ubuntu version
 Dockerfile         # Container definition for testing
-.github/workflows/ci.yaml  # GitHub Actions CI (matrix: 20.04, 22.04, 24.04)
+.github/workflows/ci.yaml  # GitHub Actions CI (matrix: 22.04, 24.04)
 .zpreztorc         # Zsh Prezto configuration
 .editorconfig      # Editor style rules
 ```
@@ -48,12 +48,11 @@ Each tool follows this pattern:
 Tests are Docker-based. Each supported Ubuntu version builds a container that runs the full bootstrap script:
 
 ```bash
-bash run-tests.sh ubuntu:20.04
 bash run-tests.sh ubuntu:22.04
 bash run-tests.sh ubuntu:24.04
 ```
 
-CI runs all three versions in parallel via GitHub Actions matrix strategy.
+CI runs both versions in parallel via GitHub Actions matrix strategy.
 
 ## Requirements
 
diff --git a/bootstrap.sh b/bootstrap.sh
index ecad3e5..26701a5 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -38,7 +38,6 @@ CURL_CMD="curl -sSLf"
 SPINNER_PID=""
 
 UBUNTU_SUPPORTED_VERSIONS=(
-    "20.04"
     "22.04"
     "24.04"
 )
diff --git a/run-tests.sh b/run-tests.sh
index ce69bc6..dd52e64 100755
--- a/run-tests.sh
+++ b/run-tests.sh
@@ -1,7 +1,6 @@
 #!/bin/bash
 
 BASE_IMAGES=(
-    "ubuntu:20.04"
     "ubuntu:22.04"
     "ubuntu:24.04"
 )