diff --git a/.github/workflows/test_v8.yml b/.github/workflows/test_v8.yml
deleted file mode 100644
index 8fd912d..0000000
--- a/.github/workflows/test_v8.yml
+++ /dev/null
@@ -1,39 +0,0 @@
-name: Test Sm v8
-
-on:
-  workflow_dispatch:
-  push:
-    branches:
-      - main
-      - dev
-  pull_request:
-    branches:
-      - "**"
-
-jobs:
-  run_test_pipeline:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v3
-      - name: Setup environment
-        uses: conda-incubator/setup-miniconda@v3
-        with:
-          channel-priority: strict
-          activate-environment: snakemake
-          auto-activate-base: false
-          miniforge-version: latest
-          environment-file: .test/environment_v8.yaml
-      - name: Run test pipeline
-        shell: bash -el {0}
-        run: snakemake --snakefile .test/Snakefile --configfile config/config.yaml .test/targets.yaml --use-conda -c1 --conda-frontend conda --keep-going --notemp
-      - name: Pack logs
-        if: success() || failure()
-        shell: bash -el {0}
-        run: tar czf logs.tar.gz .test/output .snakemake/log
-      - name: Upload output file
-        if: success() || failure()
-        uses: actions/upload-artifact@v4
-        with:
-          name: output-logs
-          path: logs.tar.gz
diff --git a/.test/environment_apptainer.yaml b/.test/environment_apptainer.yaml
index dc20bb7..e17bee1 100644
--- a/.test/environment_apptainer.yaml
+++ b/.test/environment_apptainer.yaml
@@ -5,5 +5,5 @@ channels:
   - defaults
 dependencies:
   - python==3.11.6
-  - snakemake==9.1.6
+  - snakemake==9.15.0
   - apptainer==1.4.1
diff --git a/.test/environment_v8.yaml b/.test/environment_v8.yaml
deleted file mode 100644
index 8f4b84c..0000000
--- a/.test/environment_v8.yaml
+++ /dev/null
@@ -1,8 +0,0 @@
-name: snakemake
-channels:
-  - conda-forge
-  - bioconda
-  - defaults
-dependencies:
-  - python==3.11.6
-  - snakemake==8.30.0
diff --git a/.test/environment_v9.yaml b/.test/environment_v9.yaml
index 2ff55fd..26edd4c 100644
--- a/.test/environment_v9.yaml
+++ b/.test/environment_v9.yaml
@@ -5,4 +5,4 @@ channels:
   - defaults
 dependencies:
   - python==3.11.6
-  - snakemake==9.1.6
+  - snakemake==9.15.0
diff --git a/README.md b/README.md
index caaa59b..cf44879 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,6 @@
 
 ![Install workflow](https://github.com/PathoGenOmics-Lab/VIPERA/actions/workflows/install.yml/badge.svg)
 ![Test workflow with Snakemake v7](https://github.com/PathoGenOmics-Lab/VIPERA/actions/workflows/test_v7.yml/badge.svg)
-![Test workflow with Snakemake v8](https://github.com/PathoGenOmics-Lab/VIPERA/actions/workflows/test_v8.yml/badge.svg)
 ![Test workflow with Snakemake v9](https://github.com/PathoGenOmics-Lab/VIPERA/actions/workflows/test_v9.yml/badge.svg)
 ![Test workflow with Snakemake v9 and Apptainer](https://github.com/PathoGenOmics-Lab/VIPERA/actions/workflows/test_apptainer.yml/badge.svg)
 
@@ -42,8 +41,8 @@ It supports dependency management through either conda or Apptainer/Singularity,
 
 We use continuous integration (CI) to automatically verify that all dependencies install correctly
 with Snakemake v7.32.4 (see GitHub Action `Install`), and to test that VIPERA runs
-successfully with Snakemake v7.32.4, v8.30.0, and v9.1.6 using conda (Actions `Test Sm v[7-9]`).
-We also test a containerized workflow with Snakemake v9.1.6 and Apptainer using a
+successfully with Snakemake v7.32.4 and v9.15.0 using conda (Actions `Test Sm v(7|9)`).
+We also test a containerized workflow with Snakemake v9.15.0 and Apptainer using a
 [remote image](https://hub.docker.com/r/ahmig/vipera) (Action `Test Sm v9 Apptainer`).
 This image is automatically updated in every version (Action `Deploy`).