diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index c15184b..554130c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -15,10 +15,17 @@ jobs:
     strategy:
       matrix:
         include:
-          - context: alpine3.12
+          - context: alpine
+            args: |
+              ALPINE_VERSION=3.15
             tags: |
-              nightly-alpine3.12
+              nightly-alpine3.15
               nightly-alpine
+          - context: alpine
+            args: |
+              ALPINE_VERSION=3.14
+            tags: |
+              nightly-alpine3.14
           - context: bullseye
             tags: |
               nightly-bullseye
@@ -66,6 +73,7 @@ jobs:
       - uses: docker/build-push-action@v2
         with:
           context: ${{ matrix.context }}
+          build-args: ${{ matrix.args }}
           platforms: linux/amd64,linux/arm64
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
diff --git a/alpine3.12/Dockerfile b/alpine/Dockerfile
similarity index 83%
rename from alpine3.12/Dockerfile
rename to alpine/Dockerfile
index f9a32f7..645d54c 100644
--- a/alpine3.12/Dockerfile
+++ b/alpine/Dockerfile
@@ -1,4 +1,7 @@
-FROM alpine:3.12
+# to specify a different alpine version, use --build-arg ALPINE_VERSION=3.12
+# when building the image
+ARG ALPINE_VERSION=3.14
+FROM alpine:${ALPINE_VERSION}
 
 RUN apk add --no-cache \
         ca-certificates \