diff --git a/.github/workflows/elixir_tests.yml b/.github/workflows/elixir_tests.yml
index e1cb9fc..432baac 100644
--- a/.github/workflows/elixir_tests.yml
+++ b/.github/workflows/elixir_tests.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-20.04
 
     container:
-      image: hexpm/elixir:1.18.1-erlang-27.2-debian-bookworm-20241223
+      image: hexpm/elixir:1.17.0-erlang-27.0-debian-bookworm-20240612
 
     steps:
       - name: Install git
diff --git a/.github/workflows/exercism_test_helper_build_test.yml b/.github/workflows/exercism_test_helper_build_test.yml
index f132360..9e65ffa 100644
--- a/.github/workflows/exercism_test_helper_build_test.yml
+++ b/.github/workflows/exercism_test_helper_build_test.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-22.04
 
     container:
-      image: hexpm/elixir:1.18.1-erlang-27.2-debian-bookworm-20241223
+      image: hexpm/elixir:1.17.0-erlang-27.0-debian-bookworm-20240612
 
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
diff --git a/.tool-versions b/.tool-versions
index 2254cc0..f8bb424 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,2 +1,2 @@
-elixir 1.18.1-otp-27
-erlang 27.2
+elixir 1.17.0-otp-27
+erlang 27.0
diff --git a/Dockerfile b/Dockerfile
index 6ae88d6..b834f82 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM hexpm/elixir:1.18.1-erlang-27.2-debian-bookworm-20241223
+FROM hexpm/elixir:1.17.0-erlang-27.0-debian-bookworm-20240612
 
 # Install SSL ca certificates
 RUN apt-get update && \
diff --git a/README.md b/README.md
index 27751e6..43daa9e 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ Exercism Automated Test Runner for Elixir Exercises
 
 ## Environment
 
-The test runner currently targets exercises supporting Elixir >= 1.14 and Erlang/OTP >= 25, but is running on Elixir 1.18.0 on hexpm's `elixir:1.18.1-erlang-27.2-debian-bookworm-20241223` image.
+The test runner currently targets exercises supporting Elixir >= 1.12 and Erlang/OTP >= 24, but is running on Elixir 1.17.0 on hexpm's `elixir:1.17.0-erlang-27.0-debian-bookworm-20240612` image.
 
 The `Dockerfile` also has added `bash`, `jo` and `jq` to the image.
 
diff --git a/elixir b/elixir
index a6e44e8..6b6bc5b 160000
--- a/elixir
+++ b/elixir
@@ -1 +1 @@
-Subproject commit a6e44e85ad9fcf62562bbc1a469673ddaeb3d62e
+Subproject commit 6b6bc5b6d3ca3463b7d2b15fbf33f4864e028508
diff --git a/exercism_test_helper/mix.exs b/exercism_test_helper/mix.exs
index ea958d8..6ef5dc6 100644
--- a/exercism_test_helper/mix.exs
+++ b/exercism_test_helper/mix.exs
@@ -5,7 +5,7 @@ defmodule ExercismTestHelper.MixProject do
     [
       app: :exercism_test_helper,
       version: "0.1.2",
-      elixir: "~> 1.18",
+      elixir: "~> 1.17",
       start_permanent: Mix.env() == :prod,
       deps: deps(),
       escript: escript()