diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 5a9245e2e..8fdbab432 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -10,8 +10,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - name: checkout
-        uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: setup-zig
         uses: mlugg/setup-zig@v1
@@ -25,8 +24,7 @@ jobs:
   check_style:
     runs-on: ubuntu-latest
     steps:
-      - name: checkout
-        uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Python 3.10
         uses: actions/setup-python@v3
@@ -39,60 +37,87 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-        - name: checkout
-          uses: actions/checkout@v3
-        
-        - name: setup-zig
-          uses: mlugg/setup-zig@v1
-          with:
-            version: 0.13.0
-        
-        # GitHub's CI runners for macos seem to alternate between using a x86 and an ARM machine
-        # which is annoying to handle and results in them having invalid hardware info configurations
-        # on the virtual machine. This leads to incorrect feature detection and the CI is flaky.
-        # 
-        # If we at some point setup a self-hosted MacOS runner, we could work around the issue and
-        # enable full testing on MacOS!
-        - name: build
-          run: |
-            zig build -Dtarget=x86_64-linux -Dcpu=x86_64_v4
-            zig build -Dtarget=aarch64-macos -Dcpu=apple_m3 
+      - uses: actions/checkout@v4
+      
+      - name: setup-zig
+        uses: mlugg/setup-zig@v1
+        with:
+          version: 0.13.0
+      
+      - name: build
+        run: |
+          zig build -Denable-tsan -p output/
+          zig build test -Denable-tsan=true -Dblockstore=hashmap -Dfilter="ledger" -Dno-run -p output/tsan-test/
+            
+      - uses: actions/upload-artifact@v4
+        with:
+          name: zig-build
+          path: output/
+            
+  # # GitHub's CI runners for macos seem to alternate between using a x86 and an ARM machine
+  # # which is annoying to handle and results in them having invalid hardware info configurations
+  # # on the virtual machine. This leads to incorrect feature detection and the CI is flaky.
+  # # 
+  # # If we at some point setup a self-hosted MacOS runner, we could work around the issue and
+  # # enable full testing on MacOS!
+  # build-macos:
+  #   runs-on: ubuntu-latest
+  #   steps:
+  #     - uses: actions/checkout@v4
+
+  #     - name: setup-zig
+  #       uses: mlugg/setup-zig@v1
+  #       with:
+  #         version: 0.13.0
+
+  #     - name: build
+  #       run: zig build -Dtarget=aarch64-macos -Dcpu=apple_m3
 
   test:
     strategy:
       matrix:
         os: [ubuntu-latest]
     runs-on: ${{matrix.os}}
+    needs: build
     timeout-minutes: 60
     steps:
-      - name: checkout
-        uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: setup-zig
         uses: mlugg/setup-zig@v1
         with:
           version: 0.13.0
 
+      - uses: actions/download-artifact@v4
+        with:
+          name: zig-build
+          path: output/
+
       - name: test
         run: |
-          zig build test -Denable-tsan=true
-          zig build test -Denable-tsan=true -Dblockstore=hashmap -Dfilter="ledger"
+          output/zig-out/bin/test
+          output/tsan-test/bin/test
 
   kcov_test:
     strategy:
       matrix:
         os: [ubuntu-latest]
     runs-on: ${{matrix.os}}
+    needs: build
     timeout-minutes: 60
     steps:
-      - name: checkout
-        uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: setup-zig
         uses: mlugg/setup-zig@v1
         with:
           version: 0.13.0
 
+      - uses: actions/download-artifact@v4
+        with:
+          name: zig-build
+          path: output/
+
       - name: Set up dependencies
         run: sudo apt-get update
 
@@ -109,29 +134,50 @@ jobs:
 
       - name: run kcov
         run: |
-          bash scripts/kcov_test.sh
+          bash scripts/kcov_test.sh output/zig-out/bin/test
 
       - name: print coverage report
         run: |
           python scripts/parse_kcov.py kcov-output/test/coverage.json
 
+  build-release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: setup-zig
+        uses: mlugg/setup-zig@v1
+        with:
+          version: 0.13.0
+      
+      - name: build
+        run: |
+          zig build sig fuzz -Doptimize=ReleaseSafe
+            
+      - uses: actions/upload-artifact@v4
+        with:
+          name: zig-build-release
+          path: zig-out/
+
   gossip:
     strategy:
       matrix:
         os: [ubuntu-latest]
     runs-on: ${{matrix.os}}
+    needs: build-release
     timeout-minutes: 60
     steps:
-      - name: checkout
-        uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: setup-zig
         uses: mlugg/setup-zig@v1
         with:
           version: 0.13.0
 
-      - name: build release
-        run: zig build -Doptimize=ReleaseSafe
+      - uses: actions/download-artifact@v4
+        with:
+          name: zig-build-release
+          path: zig-out/
 
       - name: run gossip
         run: bash scripts/gossip_test.sh 120 # in seconds
@@ -142,17 +188,19 @@ jobs:
         os: [ubuntu-latest]
     runs-on: ${{matrix.os}}
     timeout-minutes: 60
+    needs: build-release
     steps:
-      - name: checkout
-        uses: actions/checkout@v2
-
+      - uses: actions/checkout@v4
+      
       - name: setup zig
         uses: mlugg/setup-zig@v1
         with:
           version: 0.13.0
 
-      - name: build
-        run: zig build -Doptimize=ReleaseSafe -Dno-run fuzz
+      - uses: actions/download-artifact@v4
+        with:
+          name: zig-build-release
+          path: zig-out/
 
       - name: run
         run: ./zig-out/bin/fuzz gossip_service 19 10000
@@ -162,21 +210,20 @@ jobs:
       matrix:
         os: [ubuntu-latest]
     runs-on: ${{matrix.os}}
+    needs: build-release
     timeout-minutes: 60
     steps:
-      - name: checkout
-        uses: actions/checkout@v2
-
-        with:
-          submodules: recursive
+      - uses: actions/checkout@v4
 
       - name: setup zig
         uses: mlugg/setup-zig@v1
         with:
           version: 0.13.0
 
-      - name: build
-        run: zig build -Doptimize=ReleaseSafe -Dno-run fuzz
+      - uses: actions/download-artifact@v4
+        with:
+          name: zig-build-release
+          path: zig-out/
 
       - name: run
         run: ./zig-out/bin/fuzz gossip_table 19 100000
@@ -186,18 +233,20 @@ jobs:
       matrix:
         os: [ubuntu-latest]
     runs-on: ${{matrix.os}}
+    needs: build-release
     timeout-minutes: 60
     steps:
-      - name: checkout
-        uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: setup zig
         uses: mlugg/setup-zig@v1
         with:
           version: 0.13.0
 
-      - name: build
-        run: zig build -Doptimize=ReleaseSafe -Dno-run fuzz
+      - uses: actions/download-artifact@v4
+        with:
+          name: zig-build-release
+          path: zig-out/
 
       - name: run
         run: ./zig-out/bin/fuzz allocators 19 10000
@@ -207,18 +256,21 @@ jobs:
       matrix:
         os: [ubuntu-latest]
     runs-on: ${{matrix.os}}
+    needs: build-release
     timeout-minutes: 60
     steps:
-      - name: checkout
-        uses: actions/checkout@v2
-        with:
-          submodules: recursive
+      - uses: actions/checkout@v4
+
       - name: setup zig
         uses: mlugg/setup-zig@v1
         with:
           version: 0.13.0
-      - name: build
-        run: zig build -Doptimize=ReleaseSafe -Dno-run fuzz
+
+      - uses: actions/download-artifact@v4
+        with:
+          name: zig-build-release
+          path: zig-out/
+
       - name: run
         run: ./zig-out/bin/fuzz ledger 19 10000
 
diff --git a/scripts/kcov_test.sh b/scripts/kcov_test.sh
index 7778a1bd6..50c5a474c 100755
--- a/scripts/kcov_test.sh
+++ b/scripts/kcov_test.sh
@@ -19,15 +19,20 @@ echo "=> Cleaning up"
 rm -rf kcov-output 
 mkdir kcov-output 
 
-echo "=> Building Sig" 
-zig build 
+if [ -z "$1" ] then
+    echo "=> Building Sig" 
+    zig build 
+    test_bin="./zig-out/bin/test"
+elif
+    test_bin="$1"
+fi
 
 echo "=> Running kcov on tests" 
 kcov \
     --include-pattern=src/ \
     --exclude-pattern=$HOME/.cache \
     kcov-output \
-    ./zig-out/bin/test
+    $test_bin
 
 echo "=> Opening kcov-output/index.html" 
 open kcov-output/index.html || echo "=> Failed to open kcov-output/index.html"