diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 350639eac2fd4..a6baaa1930b52 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -153,32 +153,44 @@ jobs:
         uses: actions/download-artifact@v1
         with:
           name: macos-installable
-      - name: Build hello.wasm
-        shell: bash
+      - name: Unpack toolchain
         run: |
           set -x
           tar xf $(find . -name "swift-wasm-*.tar.gz" -type f)
-          TOOLCHAIN_PATH=$(find "$PWD" -name "swift-wasm-*" -type d)
+          echo "TOOLCHAIN=$(find "$PWD" -name "swift-wasm-*" -type d)" >> $GITHUB_ENV
+      - name: Build hello.wasm
+        shell: bash
+        run: |
           echo 'print("Hello, world!")' > hello.swift
-          $TOOLCHAIN_PATH/usr/bin/swiftc \
+          $TOOLCHAIN/usr/bin/swiftc \
                 -target wasm32-unknown-wasi \
-                -sdk $TOOLCHAIN_PATH/usr/share/wasi-sysroot \
+                -sdk $TOOLCHAIN/usr/share/wasi-sysroot \
                 hello.swift -o hello.wasm && \
                 echo "Successfully linked hello.wasm"
       - name: Test SwiftPM
         shell: bash
         run: |
           set -x
-          TOOLCHAIN_PATH=$(find "$PWD" -name "swift-wasm-*" -type d)
           mkdir test
           cd test
-          $TOOLCHAIN_PATH/usr/bin/swift package init
-          $TOOLCHAIN_PATH/usr/bin/swift build --triple wasm32-unknown-wasi
+          $TOOLCHAIN/usr/bin/swift package init
+          $TOOLCHAIN/usr/bin/swift build --triple wasm32-unknown-wasi
       - name: Upload hello.wasm compiled with macOS package
         uses: actions/upload-artifact@v1
         with:
           name: macos-hello.wasm
           path: hello.wasm
+      - name: Checkout integration-tests
+        uses: actions/checkout@v2
+        with:
+          repository: swiftwasm/integration-tests
+          path: integration-tests
+          ref: release/5.3
+      - name: Run integration tests
+        run: |
+          sudo xcode-select --switch /Applications/Xcode_12.2.app/Contents/Developer/
+          swift run # Use TOOLCHAIN env value
+        working-directory: ${{ github.workspace }}/integration-tests
 
   ubuntu1804_smoke_test:
     name: Run smoke tests on Ubuntu 18.04
@@ -189,32 +201,42 @@ jobs:
         uses: actions/download-artifact@v1
         with:
           name: ubuntu18.04-installable
-      - name: Build hello.wasm
-        shell: bash
+      - name: Unpack toolchain
         run: |
           set -x
           tar xf $(find . -name "swift-wasm-*.tar.gz" -type f)
-          TOOLCHAIN_PATH=$(find "$PWD" -name "swift-wasm-*" -type d)
+          echo "TOOLCHAIN=$(find "$PWD" -name "swift-wasm-*" -type d)" >> $GITHUB_ENV
+      - name: Build hello.wasm
+        shell: bash
+        run: |
           echo 'print("Hello, world!")' > hello.swift
-          $TOOLCHAIN_PATH/usr/bin/swiftc \
+          $TOOLCHAIN/usr/bin/swiftc \
                 -target wasm32-unknown-wasi \
-                -sdk $TOOLCHAIN_PATH/usr/share/wasi-sysroot \
+                -sdk $TOOLCHAIN/usr/share/wasi-sysroot \
                 hello.swift -o hello.wasm && \
                 echo "Successfully linked hello.wasm"
       - name: Test SwiftPM
         shell: bash
         run: |
           set -x
-          TOOLCHAIN_PATH=$(find "$PWD" -name "swift-wasm-*" -type d)
           mkdir test
           cd test
-          $TOOLCHAIN_PATH/usr/bin/swift package init
-          $TOOLCHAIN_PATH/usr/bin/swift build --triple wasm32-unknown-wasi
+          $TOOLCHAIN/usr/bin/swift package init
+          $TOOLCHAIN/usr/bin/swift build --triple wasm32-unknown-wasi
       - name: Upload hello.wasm compiled with Ubuntu 18.04 package
         uses: actions/upload-artifact@v1
         with:
           name: ubuntu18.04-hello.wasm
           path: hello.wasm
+      - name: Checkout integration-tests
+        uses: actions/checkout@v2
+        with:
+          repository: swiftwasm/integration-tests
+          path: integration-tests
+          ref: release/5.3
+      - name: Run integration tests
+        run: swift run # Use TOOLCHAIN env value
+        working-directory: ${{ github.workspace }}/integration-tests
 
   ubuntu2004_smoke_test:
     name: Run smoke tests on Ubuntu 20.04
@@ -225,29 +247,39 @@ jobs:
         uses: actions/download-artifact@v1
         with:
           name: ubuntu20.04-installable
-      - name: Build hello.wasm
-        shell: bash
+      - name: Unpack toolchain
         run: |
           set -x
           tar xf $(find . -name "swift-wasm-*.tar.gz" -type f)
-          TOOLCHAIN_PATH=$(find "$PWD" -name "swift-wasm-*" -type d)
+          echo "TOOLCHAIN=$(find "$PWD" -name "swift-wasm-*" -type d)" >> $GITHUB_ENV
+      - name: Build hello.wasm
+        shell: bash
+        run: |
           echo 'print("Hello, world!")' > hello.swift
-          $TOOLCHAIN_PATH/usr/bin/swiftc \
+          $TOOLCHAIN/usr/bin/swiftc \
                 -target wasm32-unknown-wasi \
-                -sdk $TOOLCHAIN_PATH/usr/share/wasi-sysroot \
+                -sdk $TOOLCHAIN/usr/share/wasi-sysroot \
                 hello.swift -o hello.wasm && \
                 echo "Successfully linked hello.wasm"
       - name: Test SwiftPM
         shell: bash
         run: |
           set -x
-          TOOLCHAIN_PATH=$(find "$PWD" -name "swift-wasm-*" -type d)
           mkdir test
           cd test
-          $TOOLCHAIN_PATH/usr/bin/swift package init
-          $TOOLCHAIN_PATH/usr/bin/swift build --triple wasm32-unknown-wasi
+          $TOOLCHAIN/usr/bin/swift package init
+          $TOOLCHAIN/usr/bin/swift build --triple wasm32-unknown-wasi
       - name: Upload hello.wasm compiled with Ubuntu 20.04 package
         uses: actions/upload-artifact@v1
         with:
           name: ubuntu20.04-hello.wasm
           path: hello.wasm
+      - name: Checkout integration-tests
+        uses: actions/checkout@v2
+        with:
+          repository: swiftwasm/integration-tests
+          path: integration-tests
+          ref: release/5.3
+      - name: Run integration tests
+        run: swift run # Use TOOLCHAIN env value
+        working-directory: ${{ github.workspace }}/integration-tests
diff --git a/utils/webassembly/build-foundation.sh b/utils/webassembly/build-foundation.sh
index be517ad788881..4cb1dfe0233e8 100755
--- a/utils/webassembly/build-foundation.sh
+++ b/utils/webassembly/build-foundation.sh
@@ -21,10 +21,10 @@ cmake -G Ninja \
 ninja -v
 ninja -v install
 
-# On macOS the target CoreFoundation shadows the CoreFoundation suppplied by Xcode.
-# On Linux though there's no system CoreFoundation, its headers have to be shipped
-# in the installable archive and serve for both host and target.
-if [[ "$(uname)" == "Darwin" ]]; then
-  mv $DESTINATION_TOOLCHAIN/usr/lib/swift/CoreFoundation \
-    $DESTINATION_TOOLCHAIN/usr/lib/swift/wasi/wasm32/CoreFoundation
-fi
+mv $DESTINATION_TOOLCHAIN/usr/lib/swift/CoreFoundation \
+  $DESTINATION_TOOLCHAIN/usr/lib/swift_static/CoreFoundation
+
+mv $DESTINATION_TOOLCHAIN/usr/lib/swift/wasi/wasm32/Foundation.swiftmodule \
+  $DESTINATION_TOOLCHAIN/usr/lib/swift_static/wasi/wasm32/Foundation.swiftmodule
+mv $DESTINATION_TOOLCHAIN/usr/lib/swift/wasi/wasm32/Foundation.swiftdoc \
+  $DESTINATION_TOOLCHAIN/usr/lib/swift_static/wasi/wasm32/Foundation.swiftdoc
diff --git a/utils/webassembly/build-toolchain.sh b/utils/webassembly/build-toolchain.sh
index 447c0e4bb8755..1527e51e764c8 100755
--- a/utils/webassembly/build-toolchain.sh
+++ b/utils/webassembly/build-toolchain.sh
@@ -121,7 +121,10 @@ merge_toolchains() {
   rsync -v -a $TARGET_TOOLCHAIN_SDK/usr/bin/ $DIST_TOOLCHAIN_SDK/usr/bin/
 
   # Replace absolute sysroot path with relative path
-  sed -i -e "s@\".*/include@\"../../../../share/wasi-sysroot/include@g" $DIST_TOOLCHAIN_SDK/usr/lib/swift/wasi/wasm32/wasi.modulemap
+  sed -i.bak -e "s@\".*/include@\"../../../../share/wasi-sysroot/include@g" "$DIST_TOOLCHAIN_SDK/usr/lib/swift/wasi/wasm32/wasi.modulemap"
+  rm "$DIST_TOOLCHAIN_SDK/usr/lib/swift/wasi/wasm32/wasi.modulemap.bak"
+  sed -i.bak -e "s@\".*/include@\"../../../../share/wasi-sysroot/include@g" "$DIST_TOOLCHAIN_SDK/usr/lib/swift_static/wasi/wasm32/wasi.modulemap"
+  rm "$DIST_TOOLCHAIN_SDK/usr/lib/swift_static/wasi/wasm32/wasi.modulemap.bak"
 }
 
 create_darwin_info_plist() {
diff --git a/utils/webassembly/build-xctest.sh b/utils/webassembly/build-xctest.sh
index 103edd0fcf6df..c2eb7ba1f3955 100755
--- a/utils/webassembly/build-xctest.sh
+++ b/utils/webassembly/build-xctest.sh
@@ -15,7 +15,7 @@ cmake -G Ninja \
   -DWASI_SDK_PATH="$SOURCE_PATH/wasi-sdk" \
   -DBUILD_SHARED_LIBS=OFF \
   -DCMAKE_Swift_COMPILER_FORCED=ON \
-  -DSWIFT_FOUNDATION_PATH=$DESTINATION_TOOLCHAIN/usr/lib/swift/wasi/wasm32 \
+  -DSWIFT_FOUNDATION_PATH=$DESTINATION_TOOLCHAIN/usr/lib/swift_static/wasi/wasm32 \
   "${SOURCE_PATH}/swift-corelibs-xctest"
   
 ninja -v