diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 456af27..723cfa9 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -8,7 +8,7 @@ name: Unit testing
 jobs:
   r_cmd_check:
     name: R CMD check
-    runs-on: ubuntu-latests
+    runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
     - uses: r-lib/actions/setup-r@v2
@@ -21,7 +21,7 @@ jobs:
         error-on: '"error"'
   r_cmd_check_as_cran:
     name: R CMD check as CRAN
-    runs-on: ubuntu-latests
+    runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
     - uses: r-lib/actions/setup-r@v2