diff --git a/.github/workflows/test-liquidsoap.yml b/.github/workflows/test-liquidsoap.yml
index dc95151..bf946b3 100644
--- a/.github/workflows/test-liquidsoap.yml
+++ b/.github/workflows/test-liquidsoap.yml
@@ -27,7 +27,7 @@ jobs:
     name: liquidsoap syntax (transcoder stereo)
     runs-on: ubuntu-latest
     container:
-      image: savonet/liquidsoap:v2.3.1
+      image: savonet/liquidsoap:v2.3.1@sha256:a546c2531a8e7606b7be5237a919949ef79af66ab4c9b638154aded49ca9f96b
       options: --user root
     steps:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
@@ -37,7 +37,7 @@ jobs:
     name: liquidsoap syntax (transcoder surround)
     runs-on: ubuntu-latest
     container:
-      image: savonet/liquidsoap:v2.3.1
+      image: savonet/liquidsoap:v2.3.1@sha256:a546c2531a8e7606b7be5237a919949ef79af66ab4c9b638154aded49ca9f96b
       options: --user root
     steps:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
@@ -47,7 +47,7 @@ jobs:
     name: liquidsoap syntax (streamer stereo)
     runs-on: ubuntu-latest
     container:
-      image: savonet/liquidsoap:v2.3.1
+      image: savonet/liquidsoap:v2.3.1@sha256:a546c2531a8e7606b7be5237a919949ef79af66ab4c9b638154aded49ca9f96b
       options: --user root
     steps:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
@@ -57,7 +57,7 @@ jobs:
     name: liquidsoap syntax (streamer surround)
     runs-on: ubuntu-latest
     container:
-      image: savonet/liquidsoap:v2.3.1
+      image: savonet/liquidsoap:v2.3.1@sha256:a546c2531a8e7606b7be5237a919949ef79af66ab4c9b638154aded49ca9f96b
       options: --user root
     steps:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2