diff --git a/.github/workflows/tic.yml b/.github/workflows/tic.yml
index 3885b81..70911bb 100644
--- a/.github/workflows/tic.yml
+++ b/.github/workflows/tic.yml
@@ -21,11 +21,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        config:
-          - {os: windows-latest, r: 'release'}
-          - {os: macOS-latest, r: 'release'}
-          - {os: ubuntu-20.04, r: 'release', rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}
-          - {os: ubuntu-20.04, r: 'devel', rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}
+        config:          
+          - {os: ubuntu-20.04, r: 'release', rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}          
 
     env:
       R_REMOTES_NO_ERRORS_FROM_WARNINGS: true