diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index bdbe2e5..5a7593b 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -17,6 +17,7 @@ jobs:
     strategy:
       matrix:
         container:
+          - debian:12
           - debian:11
           - debian:10
           - ubuntu:20.04
diff --git a/README.md b/README.md
index 35c53d9..8c3021b 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ detect-character-encoding may return `null` if no charset matches.
 
 - macOS Big Sur
 - Ubuntu 20.04 and 18.04
-- Debian 11 and 10
+- Debian 12, 11, and 10
 
 detect-character-encoding does not support 32-bit operating systems.