diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index 785cb2d..f68e9ca 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -18,7 +18,7 @@ env:
   IMAGE_NAME: ${{ github.repository }}
   TEST_TAG: ${{ github.repository }}:test
   TEST_EXPECTED_NODE_OUTPUT: "v16.14.0"
-  TEST_EXPECTED_ELIXIR_OUTPUT: "Elixir 1.13.2 (compiled with Erlang/OTP 24)"
+  TEST_EXPECTED_ELIXIR_OUTPUT: "Elixir 1.13.3 (compiled with Erlang/OTP 24)"
   TEST_EXPECTED_ERLANG_OUTPUT: "24.2.1"
 jobs:
   build-and-push-image:
diff --git a/transport-site/Dockerfile b/transport-site/Dockerfile
index 18cdd7c..f437d54 100644
--- a/transport-site/Dockerfile
+++ b/transport-site/Dockerfile
@@ -21,7 +21,7 @@ FROM ghcr.io/etalab/transport-tools:v1.0.3 as transport-tools
 # So again, to upgrade this, check out : 
 #
 # https://hub.docker.com/r/hexpm/elixir
-FROM hexpm/elixir:1.13.2-erlang-24.2.1-ubuntu-focal-20211006
+FROM hexpm/elixir:1.13.3-erlang-24.2.1-ubuntu-focal-20211006
 
 ARG DEBIAN_FRONTEND=noninteractive
 ENV TZ=Europe/Paris