diff --git a/.github/workflows/CI.yaml b/.github/workflows/CI.yaml
index 1740cd8b1..12c3e6931 100644
--- a/.github/workflows/CI.yaml
+++ b/.github/workflows/CI.yaml
@@ -32,7 +32,7 @@ jobs:
       - name: Check number of cores
         run: |
           lscpu
-          lscpu | grep "CPU(s):                       " | awk '{print $2}' > num_cores
+          lscpu | grep "CPU(s):                         " | awk '{print $2}' > num_cores
           echo "NUM_CORES=$(cat num_cores)" >> $GITHUB_ENV
 
       - uses: actions/checkout@v4
@@ -81,7 +81,7 @@ jobs:
       - name: Check number of cores
         run: |
           lscpu
-          lscpu | grep "CPU(s):                       " | awk '{print $2}' > num_cores
+          lscpu | grep "CPU(s):                         " | awk '{print $2}' > num_cores
           echo "NUM_CORES=$(cat num_cores)" >> $GITHUB_ENV
 
       - uses: actions/checkout@v4
@@ -141,7 +141,7 @@ jobs:
       - name: Check number of cores
         run: |
           lscpu
-          lscpu | grep "CPU(s):                       " | awk '{print $2}' > num_cores
+          lscpu | grep "CPU(s):                         " | awk '{print $2}' > num_cores
           echo "NUM_CORES=$(cat num_cores)" >> $GITHUB_ENV
 
       - uses: actions/checkout@v4
@@ -229,8 +229,8 @@ jobs:
           path: build/mopac-*-linux.*
 
   mac-build:
-    # macos-latest is now ARM-based, MOPAC is being distributed for Intel-based Macs right now, so using latest free Intel-based standard runner
-    runs-on: macos-13
+    # probably last Intel-based MacOS runner, will need to build on ARM soon
+    runs-on: macos-15-intel
     timeout-minutes: 30
 
     steps: