diff --git a/.github/workflows/elixir_tests.yml b/.github/workflows/elixir_tests.yml
index b933a10..01c99cf 100644
--- a/.github/workflows/elixir_tests.yml
+++ b/.github/workflows/elixir_tests.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-24.04
 
     container:
-      image: hexpm/elixir:1.19.4-erlang-28.1-debian-bookworm-20251117
+      image: hexpm/elixir:1.20.1-erlang-29.0-debian-bookworm-20260610
 
     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 14b9875..77eb048 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-24.04
 
     container:
-      image: hexpm/elixir:1.19.4-erlang-28.1-debian-bookworm-20251117
+      image: hexpm/elixir:1.20.1-erlang-29.0-debian-bookworm-20260610
 
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
diff --git a/.tool-versions b/.tool-versions
index 078af8b..ce199e5 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,2 +1,2 @@
-elixir 1.19.4-otp-28
-erlang 28.1
+elixir 1.20.1-otp-29
+erlang 29.0.2
diff --git a/Dockerfile b/Dockerfile
index 3afdfbc..ee78c17 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM hexpm/elixir:1.19.4-erlang-28.1-debian-bookworm-20251117 as builder
+FROM hexpm/elixir:1.20.1-erlang-29.0-debian-bookworm-20260610 as builder
 
 # Create appuser
 RUN useradd -ms /bin/bash appuser
@@ -19,7 +19,7 @@ RUN mix local.rebar --force && \
 RUN MIX_ENV=prod mix escript.build && \
   mv exercism_test_helper /opt/test-runner/bin
 
-FROM hexpm/elixir:1.19.4-erlang-28.1-debian-bookworm-20251117 as runner
+FROM hexpm/elixir:1.20.1-erlang-29.0-debian-bookworm-20260610 as runner
 COPY --from=builder /etc/passwd /etc/passwd
 COPY --from=builder /opt/test-runner /opt/test-runner
 
diff --git a/README.md b/README.md
index daeab1c..4407365 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 >= 1.15 and Erlang/OTP >= 26, but is running on Elixir 1.19.4 on hexpm's `elixir:1.19.4-erlang-28.1-debian-bookworm-20251117` image.
+The test runner currently targets exercises supporting Elixir >= 1.16 and Erlang/OTP >= 26, but is running on Elixir 1.20.1 on hexpm's `elixir:1.20.1-erlang-29.0-debian-bookworm-20260610` image.
 
 The `Dockerfile` also has added `bash`, `jo` and `jq` to the image.
 
diff --git a/elixir b/elixir
index 8d533bd..b9c9de5 160000
--- a/elixir
+++ b/elixir
@@ -1 +1 @@
-Subproject commit 8d533bdc2242f61fe76ace126bc1a15595154f2c
+Subproject commit b9c9de5d4db705bbc39fe9b1c2da7a4888ce44dd
diff --git a/exercism_test_helper/mix.exs b/exercism_test_helper/mix.exs
index 249aa00..bbf5718 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: "~> 1.19",
+      elixir: "~> 1.20",
       start_permanent: Mix.env() == :prod,
       deps: deps(),
       escript: escript()