diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index 41367bf7..4840a93d 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -25,6 +25,6 @@ Learn more about contributing: [CONTRIBUTING.md](https://github.com/nf-core/modu
 - [ ] Add a resource `label`
 - [ ] Use BioConda and BioContainers if possible to fulfil software requirements.
 - Ensure that the test works with either Docker / Singularity. Conda CI tests can be quite flaky:
-    - [ ] `PROFILE=docker pytest --tag <MODULE> --symlink --wt 2 --keep-workflow-wd`
-    - [ ] `PROFILE=singularity pytest --tag <MODULE> --symlink --wt 2 --keep-workflow-wd`
-    - [ ] `PROFILE=conda pytest --tag <MODULE> --symlink --wt 2 --keep-workflow-wd`
+    - [ ] `PROFILE=docker pytest --tag <MODULE> --symlink --keep-workflow-wd`
+    - [ ] `PROFILE=singularity pytest --tag <MODULE> --symlink --keep-workflow-wd`
+    - [ ] `PROFILE=conda pytest --tag <MODULE> --symlink --keep-workflow-wd`
diff --git a/.github/workflows/pytest-workflow.yml b/.github/workflows/pytest-workflow.yml
index 7878b8e3..84cc8eb1 100644
--- a/.github/workflows/pytest-workflow.yml
+++ b/.github/workflows/pytest-workflow.yml
@@ -80,7 +80,8 @@ jobs:
 
       # Test the module
       - name: Run pytest-workflow
-        run: TMPDIR=~ PROFILE=${{ matrix.profile }} pytest --tag ${{ matrix.tags }} --symlink --wt 2 --kwdof
+        # only use one thread for pytest-workflow to avoid race condition on conda cache. 
+        run: TMPDIR=~ PROFILE=${{ matrix.profile }} pytest --tag ${{ matrix.tags }} --symlink --kwdof
 
       - name: Upload logs on failure
         if: failure()
diff --git a/README.md b/README.md
index bb89579f..121f38fe 100644
--- a/README.md
+++ b/README.md
@@ -275,21 +275,21 @@ In order to test that each module added to `nf-core/modules` is actually working
 
         ```console
         cd /path/to/git/clone/of/nf-core/modules/
-        PROFILE=docker pytest --tag bowtie --symlink --wt 2 --keep-workflow-wd
+        PROFILE=docker pytest --tag bowtie --symlink --keep-workflow-wd
         ```
 
     - Typical command with Singularity:
 
         ```console
         cd /path/to/git/clone/of/nf-core/modules/
-        TMPDIR=~ PROFILE=singularity pytest --tag bowtie --symlink --wt 2 --keep-workflow-wd
+        TMPDIR=~ PROFILE=singularity pytest --tag bowtie --symlink --keep-workflow-wd
         ```
 
     - Typical command with Conda:
 
         ```console
         cd /path/to/git/clone/of/nf-core/modules/
-        PROFILE=conda pytest --tag bowtie --symlink --wt 2 --keep-workflow-wd
+        PROFILE=conda pytest --tag bowtie --symlink --keep-workflow-wd
         ```
 
     - See [docs on running pytest-workflow](https://pytest-workflow.readthedocs.io/en/stable/#running-pytest-workflow) for more info.