diff --git a/README.md b/README.md
index d21c5c3..c44bc2d 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ brew install mole
 **or by Script, for older macOS or latest code:**
 
 ```bash
-# Use for older macOS or latest code; add '-s latest' for newest, or '-s 1.17.0' for a fixed version.
+# Add '-s latest' for newest, '-s dev' for development, or '-s 1.17.0' for a version.
 curl -fsSL https://raw.githubusercontent.com/tw93/mole/main/install.sh | bash
 ```
 
diff --git a/install.sh b/install.sh
index 6b08dbc..c4558ed 100755
--- a/install.sh
+++ b/install.sh
@@ -112,12 +112,14 @@ resolve_source_dir() {
     if [[ -z "$branch" ]]; then
         branch="main"
     fi
-    if [[ "$branch" != "main" ]]; then
+    if [[ "$branch" != "main" && "$branch" != "dev" ]]; then
         branch="$(normalize_release_tag "$branch")"
     fi
     local url="https://github.com/tw93/mole/archive/refs/heads/main.tar.gz"
 
-    if [[ "$branch" != "main" ]]; then
+    if [[ "$branch" == "dev" ]]; then
+        url="https://github.com/tw93/mole/archive/refs/heads/dev.tar.gz"
+    elif [[ "$branch" != "main" ]]; then
         url="https://github.com/tw93/mole/archive/refs/tags/${branch}.tar.gz"
     fi
 
@@ -137,7 +139,8 @@ resolve_source_dir() {
             fi
         else
             stop_line_spinner
-            if [[ "$branch" != "main" ]]; then
+            # Only exit early for version tags (not for main/dev branches)
+            if [[ "$branch" != "main" && "$branch" != "dev" ]]; then
                 log_error "Failed to fetch version ${branch}. Check if tag exists."
                 exit 1
             fi
@@ -252,6 +255,12 @@ parse_args() {
                 version_token="$token"
                 unset 'args[$i]'
                 ;;
+            dev)
+                export MOLE_VERSION="dev"
+                export MOLE_EDGE_INSTALL="true"
+                version_token="$token"
+                unset 'args[$i]'
+                ;;
             [0-9]* | V[0-9]* | v[0-9]*)
                 export MOLE_VERSION="$token"
                 version_token="$token"
@@ -653,7 +662,8 @@ perform_install() {
     if [[ "${MOLE_EDGE_INSTALL:-}" == "true" ]]; then
         installed_version="${installed_version}-edge"
         echo ""
-        log_warning "Edge version installed on main branch"
+        local branch_name="${MOLE_VERSION:-main}"
+        log_warning "Edge version installed on ${branch_name} branch"
         log_info "This is a testing version; use 'mo update' to switch to stable"
     fi