diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index 2de6cbc..201d512 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -24,10 +24,14 @@ jobs:
       fail-fast: false
       matrix:
         config:
-          #- {os: windows-latest, r: 'release'}
+          - {os: windows-latest,
+             # r: 'release'}
+              r: "4.5"
+            }
           - {
               os: ubuntu-latest,
-              r: "release",
+              #r: "release",
+              r: "4.5",
               rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest",
             }
 
@@ -104,7 +108,6 @@ jobs:
             any::rstudioapi
             any::semver
             any::sessioninfo
-            any::testthat
             any::tibble
             any::tictoc
             any::tidyr
@@ -135,8 +138,10 @@ jobs:
             packageVersion("testthat") == required_testthat
 
           if (!testthat_ok) {
+            remove.packages("testthat")
             install.packages('ellipsis')
-            install.packages('https://cran.r-project.org/src/contrib/Archive/testthat/testthat_3.1.8.tar.gz', repos = NULL, type = 'source')
+            #install.packages('https://cran.r-project.org/src/contrib/Archive/testthat/testthat_3.1.8.tar.gz', repos = NULL, type = 'source')
+            remotes::install_version("testthat", version = "3.1.8", upgrade = "never")
           }
         shell: Rscript {0}
 
@@ -150,10 +155,10 @@ jobs:
         if: env.has_testthat == 'true'
         run: find . -name testthat.Rout -exec cat '{}' ';'
 
-      - name: Remove unwanted directories from check artifacts
-        run: |
-          Remove-Item -Recurse -Force check/*/SticsRTests
-          Remove-Item -Recurse -Force check/*/00_pkg_src
+      #- name: Remove unwanted directories from check artifacts
+        #run: |
+          #Remove-Item -Recurse -Force check/*/SticsRTests
+          #Remove-Item -Recurse -Force check/*/00_pkg_src
 
       - name: Upload check results
         if: failure()