diff --git a/.github/workflows/test-actions.yaml b/.github/workflows/test-actions.yaml
index 3dcc674..3e4d38e 100644
--- a/.github/workflows/test-actions.yaml
+++ b/.github/workflows/test-actions.yaml
@@ -1,25 +1,36 @@
 name: Test Actions
 on:
+  workflow_dispatch:
   pull_request: []
 
 jobs:
-  install-singuarity:
+  install-singularity:
     name: Install with defaults
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v3
-      - name: Singularity install defaults
+        uses: actions/checkout@v4
+      - name: Singularity install with defaults
         uses: ./
-
-  install-singuarity-custom:
-    name: Install with custom
+  install-singularity-v3-custom:
+    name: Install with custom v3
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+      - name: Singularity v3 custom install
+        uses: ./
+        with:
+          singularity-version: '3.11.0'
+          go-version: '1.18.0'
+  install-singularity-v4-custom:
+    name: Install with custom v4
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v3
-      - name: Singularity install custom
+        uses: actions/checkout@v4
+      - name: Singularity v4 custom install
         uses: ./
         with:
-          singularity-version: 3.8.4
-          go-version: 1.18.0
+          singularity-version: '4.0.1'
+          go-version: '1.20.0'
diff --git a/README.md b/README.md
index ed9abfd..803f2b4 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ on:
   pull_request: []
 
 jobs:
-  install-singuarity:
+  install-singularity:
     name: Install Singularity
     runs-on: ubuntu-latest
     steps:
@@ -30,7 +30,7 @@ jobs:
       - name: Singularity install with defaults
         uses: singularityhub/install-singularity@main
 
-  install-singuarity-custom:
+  install-singularity-custom:
     name: Install Singularity Custom
     runs-on: ubuntu-latest
     steps:
@@ -39,8 +39,8 @@ jobs:
       - name: Singularity install with defaults
         uses: singularityhub/install-singularity@main
         with:
-          singularity-version: 3.10.1
-          go-version: 1.18.0
+          singularity-version: '3.10.1'
+          go-version: '1.18.0'
 ```
 
 See the [action.yaml](action.yaml) for details.
diff --git a/action.yaml b/action.yaml
index b205943..5c7d17a 100644
--- a/action.yaml
+++ b/action.yaml
@@ -4,10 +4,10 @@ inputs:
   singularity-version:
     description: version of singularity to install
     required: true
-    default: 3.10.4
+    default: 4.0.0
   go-version:
-    description: version (or expression, e.g., >=1.17.0) of Go to install
-    default: '>=1.17.0'
+    description: version (or expression, e.g., >=1.21.0) of Go to install
+    default: '>=1.21.0'
     required: true
   cleanup:
     description: cleanup singularity directory in /tmp
@@ -17,22 +17,46 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - uses: actions/setup-go@v3
+    - uses: actions/setup-go@v5
       with:
         go-version: ${{ inputs.go-version }}
     - run: go version
       shell: bash
-  
-    - name: Install Dependencies
+    - name: Install Dependencies for v3
+      if: startsWith(inputs.singularity-version, '3')
       shell: bash
       run: |
           sudo apt-get update
           sudo apt-get install -y \
-             build-essential \
-             libseccomp-dev \
-             pkg-config \
-             squashfs-tools \
-             cryptsetup
+            build-essential \
+            libssl-dev \
+            uuid-dev \
+            libgpgme11-dev \
+            squashfs-tools \
+            libseccomp-dev \
+            pkg-config
+
+    - name: Install Dependencies for v4
+      if: startsWith(inputs.singularity-version, '4')
+      shell: bash
+      run: |
+          sudo apt-get update
+          sudo apt-get install -y \
+            autoconf \
+            automake \
+            cryptsetup \
+            git \
+            libfuse-dev \
+            libglib2.0-dev \
+            libseccomp-dev \
+            libtool \
+            pkg-config \
+            runc \
+            squashfs-tools \
+            squashfs-tools-ng \
+            uidmap \
+            wget \
+            zlib1g-dev
 
     - name: Install Singularity
       shell: bash