diff --git a/build/download-native-libs.sh b/build/download-native-libs.sh
index f09c28c6..3bb1b47e 100755
--- a/build/download-native-libs.sh
+++ b/build/download-native-libs.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-FFI_VERSION="0.4.16"
+FFI_VERSION="0.4.20"
 FFI_BASE_URL="https://github.com/pact-foundation/pact-reference/releases/download/libpact_ffi-v$FFI_VERSION"
 
 GREEN="\e[32m"
@@ -42,11 +42,27 @@ download_native() {
 
     if [[ "$OSTYPE" == "darwin"* ]]; then
         # OSX requires an empty arg passed to -i, but this doesn't work on Lin/Win
-        sed -Ei '' "s|../release_artifacts/.+$|$path/$dest_file|" "$path/$dest_file.sha256"
+        sed -Ei '' "s|\*(.*)$|\*$path/$dest_file|" "$path/$dest_file.sha256"
         shasum -a 256 --check --quiet "$path/$dest_file.sha256"
     else
-        sed -Ei "s|../release_artifacts/.+$|$path/$dest_file|" "$path/$dest_file.sha256"
-        sha256sum --check --quiet "$path/$dest_file.sha256"
+        sed -Ei "s|\*(.*)$|\*$path/$dest_file|" "$path/$dest_file.sha256"
+        if [[ "$OSTYPE" == "linux"* ]]; then
+            if ldd /bin/ls >/dev/null 2>&1; then
+                ldd_output=$(ldd /bin/ls)
+                case "$ldd_output" in
+                    *musl*) 
+                        sha256sum -c -s "$path/$dest_file.sha256"
+                        ;;
+                    *) 
+                        sha256sum --check --quiet "$path/$dest_file.sha256"
+                        ;;
+                esac
+            else
+                sha256sum --check --quiet "$path/$dest_file.sha256"   
+            fi
+        else
+            sha256sum --check --quiet "$path/$dest_file.sha256"
+        fi
     fi
 
     rm "$path/$dest_file.sha256"
@@ -60,5 +76,8 @@ download_native() {
 
 download_native "pact_ffi" "windows" "x86_64" "dll"
 download_native "libpact_ffi" "linux" "x86_64" "so"
+download_native "libpact_ffi" "linux" "aarch64" "so"
+download_native "libpact_ffi" "linux" "x86_64-musl" "so"
+download_native "libpact_ffi" "linux" "aarch64-musl" "so"
 download_native "libpact_ffi" "osx" "x86_64" "dylib"
-download_native "libpact_ffi" "osx" "aarch64-apple-darwin" "dylib"
+download_native "libpact_ffi" "osx" "aarch64-apple-darwin" "dylib"
\ No newline at end of file
diff --git a/samples/OrdersApi/Consumer.Tests/pacts/Fulfilment API-Orders API.json b/samples/OrdersApi/Consumer.Tests/pacts/Fulfilment API-Orders API.json
index 50b68e5d..2e46f664 100644
--- a/samples/OrdersApi/Consumer.Tests/pacts/Fulfilment API-Orders API.json	
+++ b/samples/OrdersApi/Consumer.Tests/pacts/Fulfilment API-Orders API.json	
@@ -158,8 +158,8 @@
   ],
   "metadata": {
     "pactRust": {
-      "ffi": "0.4.16",
-      "models": "1.1.19"
+      "ffi": "0.4.20",
+      "models": "1.2.0"
     },
     "pactSpecification": {
       "version": "4.0"
diff --git a/tests/PactNet.Tests/Drivers/FfiIntegrationTests.cs b/tests/PactNet.Tests/Drivers/FfiIntegrationTests.cs
index 81ab072e..4aa7e807 100644
--- a/tests/PactNet.Tests/Drivers/FfiIntegrationTests.cs
+++ b/tests/PactNet.Tests/Drivers/FfiIntegrationTests.cs
@@ -65,8 +65,11 @@ public async Task HttpInteraction_v3_CreatesPactFile()
                 content.Should().Be(@"{""foo"":42}");
 
                 mockServer.MockServerMismatches().Should().Be("[]");
-
+                
                 string logs = mockServer.MockServerLogs();
+                // Issue:- libpact_ffi 0.4.20 pact_ffi_mock_server_logs returns null
+                // Issue not present in 0.4.19
+                // https://github.com/pact-foundation/pact-reference/compare/libpact_ffi-v0.4.19...libpact_ffi-v0.4.20
                 logs.Should().NotBeEmpty();
 
                 this.output.WriteLine("Mock Server Logs");
diff --git a/tests/PactNet.Tests/data/v2-consumer-integration.json b/tests/PactNet.Tests/data/v2-consumer-integration.json
index 9f76184a..803f8880 100644
--- a/tests/PactNet.Tests/data/v2-consumer-integration.json
+++ b/tests/PactNet.Tests/data/v2-consumer-integration.json
@@ -74,8 +74,8 @@
   ],
   "metadata": {
     "pactRust": {
-      "ffi": "0.4.16",
-      "models": "1.1.19"
+      "ffi": "0.4.20",
+      "models": "1.2.0"
     },
     "pactSpecification": {
       "version": "2.0.0"
diff --git a/tests/PactNet.Tests/data/v3-consumer-integration.json b/tests/PactNet.Tests/data/v3-consumer-integration.json
index fa2df241..60f279e0 100644
--- a/tests/PactNet.Tests/data/v3-consumer-integration.json
+++ b/tests/PactNet.Tests/data/v3-consumer-integration.json
@@ -132,8 +132,8 @@
   ],
   "metadata": {
     "pactRust": {
-      "ffi": "0.4.16",
-      "models": "1.1.19"
+      "ffi": "0.4.20",
+      "models": "1.2.0"
     },
     "pactSpecification": {
       "version": "3.0.0"
diff --git a/tests/PactNet.Tests/data/v3-message-consumer-integration.json b/tests/PactNet.Tests/data/v3-message-consumer-integration.json
index 0c02ff57..7fab4911 100644
--- a/tests/PactNet.Tests/data/v3-message-consumer-integration.json
+++ b/tests/PactNet.Tests/data/v3-message-consumer-integration.json
@@ -36,8 +36,8 @@
       "language": "C#"
     },
     "pactRust": {
-      "ffi": "0.4.16",
-      "models": "1.1.19"
+      "ffi": "0.4.20",
+      "models": "1.2.0"
     },
     "pactSpecification": {
       "version": "3.0.0"
diff --git a/tests/PactNet.Tests/data/v3-message-integration.json b/tests/PactNet.Tests/data/v3-message-integration.json
index 85ba4363..edd2470d 100644
--- a/tests/PactNet.Tests/data/v3-message-integration.json
+++ b/tests/PactNet.Tests/data/v3-message-integration.json
@@ -16,8 +16,8 @@
   ],
   "metadata": {
     "pactRust": {
-      "ffi": "0.4.16",
-      "models": "1.1.19"
+      "ffi": "0.4.20",
+      "models": "1.2.0"
     },
     "pactSpecification": {
       "version": "3.0.0"
diff --git a/tests/PactNet.Tests/data/v3-server-integration.json b/tests/PactNet.Tests/data/v3-server-integration.json
index c9b869c0..5fcbf4e9 100644
--- a/tests/PactNet.Tests/data/v3-server-integration.json
+++ b/tests/PactNet.Tests/data/v3-server-integration.json
@@ -46,8 +46,8 @@
   ],
   "metadata": {
     "pactRust": {
-      "ffi": "0.4.16",
-      "models": "1.1.19"
+      "ffi": "0.4.20",
+      "models": "1.2.0"
     },
     "pactSpecification": {
       "version": "3.0.0"
diff --git a/tests/PactNet.Tests/data/v4-combined-integration.json b/tests/PactNet.Tests/data/v4-combined-integration.json
index d42e3ff5..b3ce3975 100644
--- a/tests/PactNet.Tests/data/v4-combined-integration.json
+++ b/tests/PactNet.Tests/data/v4-combined-integration.json
@@ -187,8 +187,8 @@
       "language": "C#"
     },
     "pactRust": {
-      "ffi": "0.4.16",
-      "models": "1.1.19"
+      "ffi": "0.4.20",
+      "models": "1.2.0"
     },
     "pactSpecification": {
       "version": "4.0"
diff --git a/tests/PactNet.Tests/data/v4-consumer-integration.json b/tests/PactNet.Tests/data/v4-consumer-integration.json
index 11d15825..45853760 100644
--- a/tests/PactNet.Tests/data/v4-consumer-integration.json
+++ b/tests/PactNet.Tests/data/v4-consumer-integration.json
@@ -152,8 +152,8 @@
   ],
   "metadata": {
     "pactRust": {
-      "ffi": "0.4.16",
-      "models": "1.1.19"
+      "ffi": "0.4.20",
+      "models": "1.2.0"
     },
     "pactSpecification": {
       "version": "4.0"
diff --git a/tests/PactNet.Tests/data/v4-message-consumer-integration.json b/tests/PactNet.Tests/data/v4-message-consumer-integration.json
index f5124e0e..591a5960 100644
--- a/tests/PactNet.Tests/data/v4-message-consumer-integration.json
+++ b/tests/PactNet.Tests/data/v4-message-consumer-integration.json
@@ -41,8 +41,8 @@
       "language": "C#"
     },
     "pactRust": {
-      "ffi": "0.4.16",
-      "models": "1.1.19"
+      "ffi": "0.4.20",
+      "models": "1.2.0"
     },
     "pactSpecification": {
       "version": "4.0"