diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
index 1a044da..745610e 100644
--- a/.github/workflows/pull-request.yml
+++ b/.github/workflows/pull-request.yml
@@ -187,11 +187,16 @@ jobs:
         mod: 500
         rem: 1
       run: |
+        brew update
+        brew install bash
+        /usr/bin/env bash --version
         uname -a
         cd pico-sdk
         git submodule update --init
         cd ..
-        bash ./tests/build.sh
+        /usr/bin/env bash ./tests/build.sh
+        ./system/picotool/picotool version
+        otool -L ./system/picotool/picotool
 
 # Build a few examples with PlatformIO to test if integration works
   build-platformio:
diff --git a/tests/common.sh b/tests/common.sh
index 7dd2044..61a5db6 100755
--- a/tests/common.sh
+++ b/tests/common.sh
@@ -112,7 +112,10 @@ function build_sketches()
             mv $build_dir/build.options.json.tmp $build_dir/build.options.json
             # Set the time of the cached core.a file to the future so the GIT header
             # we regen won't cause the builder to throw it out and rebuild from scratch.
-            touch -d 'now + 1 day' $cache_dir/core/*.a
+            uname -a | grep -qi darwin
+            if [ $? == 1 ]; then
+                touch -d 'now + 1 day' $cache_dir/core/*.a
+            fi
         fi
 
         # Clear out the last built sketch, map, elf, bin files, but leave the compiled