diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 37467de..551019f 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -14,14 +14,32 @@ jobs:
         make CXX=clang++
         go test -v ./bls
 
-  Run-on-macos:
+  Run-on-Intel-macos:
+    name: Run on Intel macos
+    runs-on: macos-13
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-go@v5
+      with:
+        go-version: '1.18.x'
+    - run: |
+        git submodule update --init --recursive
+        brew install nasm
+        make clean
+        make
+        go test -v ./bls
+
+  Run-on-ARM-macos:
     name: Run on macos
+    # Intel Mac
     runs-on: macos-latest
     steps:
     - uses: actions/checkout@v4
+    - uses: actions/setup-go@v5
+      with:
+        go-version: '1.18.x'
     - run: |
         git submodule update --init --recursive
-        brew install nasm
         make clean
         make
         go test -v ./bls
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index e3ef12a..d41b236 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -39,7 +39,9 @@ jobs:
           git config user.email github-actions@github.com
           git push --set-upstream origin release
   build-linux:
-    runs-on: ubuntu-latest
+    # For Linux build we use an Ubuntu version that's as old as possible so that
+    # the generated artifacts are compatible with not-so-recent systems
+    runs-on: ubuntu-20.04
     needs: create-branch
     steps:
       - name: Checkout code
diff --git a/src/bls b/src/bls
index ecf8c32..c9696cf 160000
--- a/src/bls
+++ b/src/bls
@@ -1 +1 @@
-Subproject commit ecf8c32b58290443b585a097dd644c4ab8ccd2c1
+Subproject commit c9696cf7e48cad1277fc13144eda154b7bd15b0d