diff --git a/.github/workflows/nightly_ci_build.yml b/.github/workflows/nightly_ci_build.yml
index 98e0ef20..21380991 100644
--- a/.github/workflows/nightly_ci_build.yml
+++ b/.github/workflows/nightly_ci_build.yml
@@ -23,10 +23,11 @@ jobs:
   weeknight-tests:
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest]
+        # os: [ubuntu-latest, windows-latest]
         simulation-type: [basic, GEB, residential, electric]
         # python-version: ["3.10"]
-    runs-on: ${{ matrix.os }}
+    # runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
     container:
       image: docker://nrel/openstudio:3.6.1
     steps: