diff --git a/prepare-ssh/action.yml b/prepare-ssh/action.yml
index 8690184..133ca54 100644
--- a/prepare-ssh/action.yml
+++ b/prepare-ssh/action.yml
@@ -20,10 +20,28 @@ runs:
       run: |
         set -eu
 
+        SUDO=""
+        [ "$(id -u)" -ne 0 ] && SUDO="sudo"
+
+        if ! command -v ssh-keyscan >/dev/null 2>&1; then
+          if command -v apt-get >/dev/null 2>&1; then
+            $SUDO apt-get update
+            $SUDO apt-get install -y --no-install-recommends openssh-client
+          else
+            echo "ssh-keyscan이 없습니다. openssh-client를 설치한 러너가 필요합니다."
+            exit 1
+          fi
+        fi
+
         mkdir -p ~/.ssh
         chmod 700 ~/.ssh
 
-        printf '%s\n' "${{ inputs.ssh-key }}" > ${{ inputs.key-path }}
-        chmod 600 ${{ inputs.key-path }}
+        KEY_PATH="${{ inputs.key-path }}"
+        case "$KEY_PATH" in
+          "~/"*) KEY_PATH="$HOME/${KEY_PATH#~/}" ;;
+        esac
 
-        ssh-keyscan -p ${{ inputs.port }} -H "${{ inputs.host }}" >> ~/.ssh/known_hosts
\ No newline at end of file
+        printf '%s\n' "${{ inputs.ssh-key }}" > "$KEY_PATH"
+        chmod 600 "$KEY_PATH"
+
+        ssh-keyscan -p ${{ inputs.port }} -H "${{ inputs.host }}" >> ~/.ssh/known_hosts
diff --git a/remote-command/action.yml b/remote-command/action.yml
index 99e9606..df9005d 100644
--- a/remote-command/action.yml
+++ b/remote-command/action.yml
@@ -22,6 +22,19 @@ runs:
       run: |
         set -eu
 
+        SUDO=""
+        [ "$(id -u)" -ne 0 ] && SUDO="sudo"
+
+        if ! command -v ssh >/dev/null 2>&1; then
+          if command -v apt-get >/dev/null 2>&1; then
+            $SUDO apt-get update
+            $SUDO apt-get install -y --no-install-recommends openssh-client
+          else
+            echo "ssh가 없습니다. openssh-client를 설치한 러너가 필요합니다."
+            exit 1
+          fi
+        fi
+
         KEY_PATH="${{ inputs.key-path }}"
         if [ -z "$KEY_PATH" ]; then
           KEY_PATH="$HOME/.ssh/deploy_key"
@@ -32,4 +45,4 @@ runs:
           "${{ inputs.user }}@${{ inputs.host }}" \
           'bash -se' << 'EOF'
         ${{ inputs.command }}
-        EOF
\ No newline at end of file
+        EOF