diff --git a/.woodpecker/test.yml b/.woodpecker/test.yml
index bef503752..20a06eba4 100644
--- a/.woodpecker/test.yml
+++ b/.woodpecker/test.yml
@@ -5,16 +5,18 @@ depends_on:
   - lint
 
 matrix:
+  # test the lowest and highest versions
   ELIXIR_VERSION:
-    - 1.14
     - 1.15
-    - 1.16
+    - 1.18
   OTP_VERSION:
-    - 25
-    - 26
+    - 24
+    - 27
   include:
-    - ELIXIR_VERSION: 1.16
-      OTP_VERSION: 26
+    - ELIXIR_VERSION: 1.15
+      OTP_VERSION: 24
+    - ELIXIR_VERSION: 1.18
+      OTP_VERSION: 27
 
 variables:
   - &setup-hex "mix local.hex --force && mix local.rebar --force"
diff --git a/ci/Dockerfile b/ci/Dockerfile
index e6a8b438c..9a399efe3 100644
--- a/ci/Dockerfile
+++ b/ci/Dockerfile
@@ -1,7 +1,6 @@
-FROM elixir:1.9.4
-
-RUN apt-get update &&\
-  apt-get install -y libmagic-dev cmake libimage-exiftool-perl ffmpeg &&\
-	mix local.hex --force &&\
-	mix local.rebar --force
-
+ARG TAG
+FROM docker.io/hexpm/elixir:${TAG}
+RUN apk update
+RUN apk add git gcc g++ musl-dev make cmake file-dev rclone wget zip imagemagick ffmpeg perl-image-exiftool exiftool
+RUN mkdir /src
+WORKDIR /src
diff --git a/ci/build-all.sh b/ci/build-all.sh
new file mode 100755
index 000000000..6aa0fd587
--- /dev/null
+++ b/ci/build-all.sh
@@ -0,0 +1,2 @@
+./build.sh 1.15-otp24 1.15.8-erlang-24.3.4.17-alpine-3.19.7
+./build.sh 1.18-otp27 1.18.2-erlang-27.2.4-alpine-3.19.7
diff --git a/ci/build.sh b/ci/build.sh
new file mode 100755
index 000000000..bf80b9208
--- /dev/null
+++ b/ci/build.sh
@@ -0,0 +1,3 @@
+echo "Building $1 using image tag $2"
+docker build -t docker.io/akkoma/ci-base:$1 --build-arg=version=$1 --build-arg=TAG=$2 .
+docker push docker.io/akkoma/ci-base:$1
diff --git a/ci/build_and_push.sh b/ci/build_and_push.sh
deleted file mode 100755
index 484cc2643..000000000
--- a/ci/build_and_push.sh
+++ /dev/null
@@ -1 +0,0 @@
-docker buildx build --platform linux/amd64,linux/arm64,linux/arm/v7 -t git.pleroma.social:5050/pleroma/pleroma/ci-base:latest --push .
diff --git a/docs/docs/installation/generic_dependencies.include b/docs/docs/installation/generic_dependencies.include
index f4d439b83..098a7c7d8 100644
--- a/docs/docs/installation/generic_dependencies.include
+++ b/docs/docs/installation/generic_dependencies.include
@@ -1,7 +1,7 @@
 ## Required dependencies
 
 * PostgreSQL 12+
-* Elixir 1.14+ (currently tested up to 1.17)
+* Elixir 1.15+ (currently tested up to 1.18)
 * Erlang OTP 25+ (currently tested up to OTP27)
 * git
 * file / libmagic
diff --git a/mix.exs b/mix.exs
index 8ec107c49..8f16d3aac 100644
--- a/mix.exs
+++ b/mix.exs
@@ -5,7 +5,7 @@ def project do
     [
       app: :pleroma,
       version: version("3.15.1"),
-      elixir: "~> 1.14",
+      elixir: "~> 1.15",
       elixirc_paths: elixirc_paths(Mix.env()),
       compilers: Mix.compilers(),
       elixirc_options: [warnings_as_errors: warnings_as_errors()],