diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cf2b7dc..7b75631 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,14 +8,16 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ELIXIR_VERSION:
-          - 1.15.3
-          - 1.14.5
-          - 1.13.3
-        OTP_VERSION:
-          - 26.0.2
-          - 25.3.2
-          - 24.3.4
+        base:
+          - 1.15.3-erlang-26.0.2-alpine-3.18.2
+          - 1.15.3-erlang-25.3.2.2-alpine-3.18.2
+          - 1.15.3-erlang-24.3.4.9-alpine-3.18.2
+          - 1.14.5-erlang-26.0.2-alpine-3.18.2
+          - 1.14.5-erlang-25.3.2.2-alpine-3.18.2
+          - 1.14.5-erlang-24.3.4.9-alpine-3.18.2
+          - 1.13.4-erlang-25.3.2.2-alpine-3.18.2
+          - 1.13.4-erlang-24.3.4.9-alpine-3.18.2
+
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout
@@ -27,6 +29,6 @@ jobs:
           github-token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Run Earthly
-        run: earthly --org cschmatzler --sat github-actions --no-output +lint --ELIXIR_VERSION=${{ matrix.ELIXIR_VERSION }} --OTP_VERSION=${{ matrix.OTP_VERSION }}
+        run: earthly --org cschmatzler --sat github-actions --no-output +lint --BASE=${{ matrix.base }}
         env:
           EARTHLY_TOKEN: ${{ secrets.EARTHLY_TOKEN }}
diff --git a/Earthfile b/Earthfile
index 040e616..2483929 100644
--- a/Earthfile
+++ b/Earthfile
@@ -1,14 +1,13 @@
 VERSION 0.7
 
-ARG --global --required ELIXIR_VERSION
-ARG --global --required OTP_VERSION
+ARG --global --required BASE
 
 ci:
   BUILD +test
   BUILD +lint
 
 setup-base:
-  FROM hexpm/elixir:$ELIXIR_VERSION-erlang-$OTP_VERSION
+  FROM hexpm/elixir:$BASE
 
   RUN apk add --no-cache build-base git
   RUN mix do local.rebar --force, \