diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2d1006c..201b9ce 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ on:
 
 jobs:
   cancel-previous-runs:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     steps:
       - name: Cancel Previous Runs
         uses: styfle/cancel-workflow-action@0.11.0
@@ -21,7 +21,7 @@ jobs:
           access_token: ${{ github.token }}
 
   build_linux-x64-musl:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
       - uses: dtolnay/rust-toolchain@stable
@@ -32,7 +32,7 @@ jobs:
           node-version: '16'
       - uses: Swatinem/rust-cache@v2
       - name: Download x86_64-linux-musl-cross toolchain
-        run: curl -O -C - https://musl.cc/x86_64-linux-musl-cross.tgz
+        run: curl -O -L -C - https://github.com/musl-cc/musl.cc/releases/download/v0.0.1/x86_64-linux-musl-cross.tgz
       - name: Install x86_64-linux-musl-cross toolchain
         run: tar xf x86_64-linux-musl-cross.tgz
       - name: Configure linux-x64-musl cross compile
@@ -49,14 +49,14 @@ jobs:
         run: npm i
       - name: Build
         run: npm run build:cargo
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: linux-x64-musl
           path: native/linux-x64-musl.node
           if-no-files-found: error
 
   build_linux-arm64-musl:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
       - uses: dtolnay/rust-toolchain@stable
@@ -67,7 +67,7 @@ jobs:
           node-version: '16'
       - uses: Swatinem/rust-cache@v2
       - name: Download aarch64-linux-musl-cross toolchain
-        run: curl -O -C - https://musl.cc/aarch64-linux-musl-cross.tgz
+        run: curl -O -L -C - https://github.com/musl-cc/musl.cc/releases/download/v0.0.1/aarch64-linux-musl-cross.tgz
       - name: Install aarch64-linux-musl-cross toolchain
         run: tar xf aarch64-linux-musl-cross.tgz
       - name: Configure linux-arm64-musl cross compile
@@ -84,14 +84,14 @@ jobs:
         run: npm i
       - name: Build
         run: npm run build:cargo
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: linux-arm64-musl
           path: native/linux-arm64-musl.node
           if-no-files-found: error
 
   build_linux-x64-glibc:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     container:
       image: rust:buster
     steps:
@@ -107,14 +107,14 @@ jobs:
         run: npm i
       - name: Build
         run: npm run build:cargo
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: linux-x64-glibc
           path: native/linux-x64-glibc.node
           if-no-files-found: error
 
   build_linux-arm64-glibc:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     container:
       image: rust:buster
     steps:
@@ -141,7 +141,7 @@ jobs:
         run: npm i
       - name: Build
         run: npm run build:cargo
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: linux-arm64-glibc
           path: native/linux-arm64-glibc.node
@@ -162,7 +162,7 @@ jobs:
         run: npm i
       - name: Build
         run: npm run build:cargo
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: win32-x64
           path: native/win32-x64.node
@@ -184,7 +184,7 @@ jobs:
         run: npm i
       - name: Build
         run: npm run build:cargo
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: darwin-x64
           path: native/darwin-x64.node
@@ -210,19 +210,19 @@ jobs:
         run: npm i
       - name: Build
         run: npm run build:cargo
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: darwin-arm64
           path: native/darwin-arm64.node
           if-no-files-found: error
 
   test_linux-arm64-glibc:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     needs:
       - build_linux-arm64-glibc
     steps:
       - uses: actions/checkout@v3
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: linux-arm64-glibc
           path: native
@@ -244,12 +244,12 @@ jobs:
             npm run test:js
 
   test_linux-arm64-musl:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     needs:
       - build_linux-arm64-musl
     steps:
       - uses: actions/checkout@v3
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: linux-arm64-musl
           path: native
@@ -269,14 +269,14 @@ jobs:
             npm run test:js
 
   test_linux-x64-glibc:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     container:
       image: node:16-bullseye
     needs:
       - build_linux-x64-glibc
     steps:
       - uses: actions/checkout@v3
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: linux-x64-glibc
           path: native
@@ -291,14 +291,14 @@ jobs:
         run: npm i && npm test
 
   test_linux-x64-musl:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     container:
       image: node:16-alpine
     needs:
       - build_linux-x64-musl
     steps:
       - uses: actions/checkout@v3
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: linux-x64-musl
           path: native
@@ -318,7 +318,7 @@ jobs:
       - build_win-x64
     steps:
       - uses: actions/checkout@v3
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: win32-x64
           path: native
@@ -339,7 +339,7 @@ jobs:
       - build_darwin-x64
     steps:
       - uses: actions/checkout@v3
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: darwin-x64
           path: native
@@ -354,12 +354,12 @@ jobs:
         run: npm i && npm test
 
   npm-package:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     needs:
       - build_linux-x64-musl
       - build_linux-arm64-musl
       - build_linux-x64-glibc
-      - build_linux-arm64-glibc
+      # - build_linux-arm64-glibc
       - build_win-x64
       - build_darwin-arm64
     env:
@@ -372,7 +372,7 @@ jobs:
           node-version: '16'
           registry-url: https://registry.npmjs.org
           always-auth: true
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           path: native
       - name: Position downloaded artifacts
@@ -391,7 +391,7 @@ jobs:
         run: |
           npm pack
           mv "stacks-encoding-native-js-$NPM_PACKAGE_VERSION.tgz" "stacks-encoding-native-js.tgz"
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: stacks-encoding-native-js.tgz
           path: stacks-encoding-native-js.tgz
diff --git a/src/stacks_tx/deserialize.rs b/src/stacks_tx/deserialize.rs
index e1815d2..0a6483d 100644
--- a/src/stacks_tx/deserialize.rs
+++ b/src/stacks_tx/deserialize.rs
@@ -332,6 +332,7 @@ impl ClarityVersion {
             x if x == ClarityVersion::Clarity1 as u8 => Some(ClarityVersion::Clarity1),
             x if x == ClarityVersion::Clarity2 as u8 => Some(ClarityVersion::Clarity2),
             x if x == ClarityVersion::Clarity3 as u8 => Some(ClarityVersion::Clarity3),
+            x if x == ClarityVersion::Clarity4 as u8 => Some(ClarityVersion::Clarity4),
             _ => None,
         }
     }
@@ -681,6 +682,7 @@ pub enum ClarityVersion {
     Clarity1 = 1,
     Clarity2 = 2,
     Clarity3 = 3,
+    Clarity4 = 4,
 }
 
 #[repr(u8)]