diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 60dcc7b9f0..d08ea3d893 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -100,8 +100,8 @@ stages:
 
 # Alpine Linux
 
-.alpine-3.14-amd64: &alpine_3_14_amd64_image
-  image: "$CI_REGISTRY_IMAGE:alpine-3.14-amd64"
+.alpine-3.15-amd64: &alpine_3_15_amd64_image
+  image: "$CI_REGISTRY_IMAGE:alpine-3.15-amd64"
   <<: *linux_amd64
 
 # Oracle Linux
@@ -566,27 +566,27 @@ push:docs:
     - main@isc-projects/bind9
     - /^v9_[1-9][0-9]$/@isc-projects/bind9
 
-# Jobs for regular GCC builds on Alpine Linux 3.14 (amd64)
+# Jobs for regular GCC builds on Alpine Linux 3.15 (amd64)
 
-gcc:alpine3.14:amd64:
+gcc:alpine3.15:amd64:
   variables:
     CC: gcc
     CFLAGS: "${CFLAGS_COMMON}"
-  <<: *alpine_3_14_amd64_image
+  <<: *alpine_3_15_amd64_image
   <<: *build_job
 
-system:gcc:alpine3.14:amd64:
-  <<: *alpine_3_14_amd64_image
+system:gcc:alpine3.15:amd64:
+  <<: *alpine_3_15_amd64_image
   <<: *system_test_job
   needs:
-    - job: gcc:alpine3.14:amd64
+    - job: gcc:alpine3.15:amd64
       artifacts: true
 
-unit:gcc:alpine3.14:amd64:
-  <<: *alpine_3_14_amd64_image
+unit:gcc:alpine3.15:amd64:
+  <<: *alpine_3_15_amd64_image
   <<: *unit_test_job
   needs:
-    - job: gcc:alpine3.14:amd64
+    - job: gcc:alpine3.15:amd64
       artifacts: true
 
 # Jobs for regular GCC builds on Oracle Linux 7 (amd64)
diff --git a/PLATFORMS b/PLATFORMS
index d4a24ca995..5a32708a03 100644
--- a/PLATFORMS
+++ b/PLATFORMS
@@ -34,7 +34,7 @@ offer support on a "best effort" basis for some.
 
 Regularly tested platforms
 
-As of Oct 2021, BIND 9.16 is fully supported and regularly tested on the
+As of Dec 2021, BIND 9.16 is fully supported and regularly tested on the
 following systems:
 
   * Debian 9, 10, 11
@@ -43,7 +43,7 @@ following systems:
   * Red Hat Enterprise Linux / CentOS / Oracle Linux 7, 8
   * FreeBSD 11.4, 12.2, 13.0
   * OpenBSD 7.0
-  * Alpine Linux 3.14
+  * Alpine Linux 3.15
 
 The amd64, i386, armhf and arm64 CPU architectures are all fully
 supported.
diff --git a/PLATFORMS.md b/PLATFORMS.md
index 60e7d91c03..3f672fbab7 100644
--- a/PLATFORMS.md
+++ b/PLATFORMS.md
@@ -42,7 +42,7 @@ offer support on a "best effort" basis for some.
 
 ### Regularly tested platforms
 
-As of Oct 2021, BIND 9.16 is fully supported and regularly tested on the
+As of Dec 2021, BIND 9.16 is fully supported and regularly tested on the
 following systems:
 
 * Debian 9, 10, 11
@@ -51,7 +51,7 @@ following systems:
 * Red Hat Enterprise Linux / CentOS / Oracle Linux 7, 8
 * FreeBSD 11.4, 12.2, 13.0
 * OpenBSD 7.0
-* Alpine Linux 3.14
+* Alpine Linux 3.15
 
 The amd64, i386, armhf and arm64 CPU architectures are all fully supported.