diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a3328b6..bc02d30 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -82,7 +82,7 @@ jobs:
         operating_system:
           - flavor: "alpine"
             # renovate: datasource=docker depName=alpine versioning=docker
-            OS_VERSION: "3.20"
+            OS_VERSION: "3.21"
           - flavor: "bookworm"
         pg_target:
           - "12"
diff --git a/Dockerfile.alpine b/Dockerfile.alpine
index ed20fd7..b6c5b6e 100644
--- a/Dockerfile.alpine
+++ b/Dockerfile.alpine
@@ -1,7 +1,7 @@
 ARG PGTARGET=17
 
 # renovate: datasource=docker depName=alpine versioning=loose
-ARG ALPINE_VERSION=3.20
+ARG ALPINE_VERSION=3.21
 
 ### Things we need in all build containers
 FROM alpine:${ALPINE_VERSION} AS base-build