diff --git a/Cargo.lock b/Cargo.lock
index 3b4a591..3e4ff5f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -51,7 +51,7 @@ checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
 [[package]]
 name = "bulkrename"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "ansi_term",
  "anyhow",
diff --git a/Cargo.toml b/Cargo.toml
index f63420d..0f0e0ba 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "bulkrename"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2021"
 
 readme = "README.md"
diff --git a/chris_plugin_info.json b/chris_plugin_info.json
index 01f53c5..32f2742 100644
--- a/chris_plugin_info.json
+++ b/chris_plugin_info.json
@@ -4,34 +4,34 @@
     {
       "name": "filter",
       "type": "str",
-      "optional": true,
+      "optional": false,
       "flag": "--filter",
       "short_flag": "-f",
       "action": "store",
       "help": "Input path filter. Paths which do not match this regex are excluded.",
-      "default": ".*",
+      "default": null,
       "ui_exposed": true
     },
     {
       "name": "expression",
       "type": "str",
-      "optional": true,
+      "optional": false,
       "flag": "--expression",
       "short_flag": "-e",
       "action": "store",
       "help": "Regular expression to match paths. See https://docs.rs/regex/1.5.5/regex/#syntax",
-      "default": "(.*)",
+      "default": null,
       "ui_exposed": true
     },
     {
       "name": "replacement",
       "type": "str",
-      "optional": true,
+      "optional": false,
       "flag": "--replace",
       "short_flag": "-r",
       "action": "store",
       "help": "Replacement string with capture groups. See https://docs.rs/regex/1.5.5/regex/#grouping-and-flags",
-      "default": "\\1",
+      "default": null,
       "ui_exposed": true
     }
   ],
@@ -42,7 +42,7 @@
   "description": "A ChRIS plugin to rename paths using regex",
   "documentation": "https://github.com/FNNDSC/pl-bulk-rename",
   "license": "MIT",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "selfpath": "/usr/local/bin",
   "selfexec": "bulkrename",
   "execshell": "/docker-entrypoint.sh",
diff --git a/src/main.rs b/src/main.rs
index 44b7af7..b7c2171 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -19,15 +19,15 @@ disable_help_subcommand = true
 )]
 struct Cli {
     /// Input path filter. Paths which do not match this regex are excluded.
-    #[clap(short, long, default_value = ".*")]
+    #[clap(short, long)]
     filter: String,
 
     /// Regular expression to match paths
-    #[clap(short, long, default_value = "(.*)")]
+    #[clap(short, long)]
     expression: String,
 
     /// Replacement string with capture groups
-    #[clap(short, long, default_value = "$0")]
+    #[clap(short, long)]
     replace: String,
 
     /// Silence output