diff --git a/.github/workflows/check-current-testthat.yaml b/.github/workflows/check-current-testthat.yaml
index def2645b9..ea4024c14 100644
--- a/.github/workflows/check-current-testthat.yaml
+++ b/.github/workflows/check-current-testthat.yaml
@@ -103,7 +103,10 @@ jobs:
 
       - name: Set LANG
         if: matrix.config.lang
-        run: echo "LANG=${{ matrix.config.lang }}" >> "$GITHUB_ENV"
+        # the package reads the language from LANG, while R needs a locale that is installed on the runner, so LC_ALL is set to the UTF-8 locale that is always available
+        run: |
+          echo "LANG=${{ matrix.config.lang }}" >> "$GITHUB_ENV"
+          echo "LC_ALL=C.UTF-8" >> "$GITHUB_ENV"
 
       - name: Set up scenario '${{ matrix.config.scenario }}'
         if: matrix.config.scenario
diff --git a/DESCRIPTION b/DESCRIPTION
index 8a53dce68..af56b0160 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: AMR
-Version: 3.0.1.9135
-Date: 2026-10-14
+Version: 3.0.1.9136
+Date: 2026-10-15
 Title: Antimicrobial Resistance Data Analysis
 Description: Functions to simplify and standardise antimicrobial resistance (AMR)
   data analysis and to work with microbial and antimicrobial properties by
diff --git a/NEWS.md b/NEWS.md
index fcc08d931..ddc3eedbc 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,4 +1,4 @@
-# AMR 3.0.1.9135
+# AMR 3.0.1.9136
 
 Planned as v3.1.0, mid October 2026.
 
diff --git a/tests/testthat/test-mo_source.R b/tests/testthat/test-mo_source.R
index 947d381f4..ae83854e5 100644
--- a/tests/testthat/test-mo_source.R
+++ b/tests/testthat/test-mo_source.R
@@ -29,7 +29,7 @@
 
 test_that("test-mo_source.R", {
   # set_mo_source() and the interactive branches of get_mo_source() only work in interactive sessions, see .github/scripts/run_tests.sh
-  skip_if_not(interactive())
+  skip_if(!interactive())
   skip_on_cran()
 
   dir <- tempfile("mo_source_test")