diff --git a/Cargo.lock b/Cargo.lock
index a0401cb..e5e9db8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,11 +2,20 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "anstream"
-version = "0.6.11"
+version = "0.6.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6e2e1ebcb11de5c03c67de28a7df593d32191b44939c482e97702baaaa6ab6a5"
+checksum = "96b09b5178381e0874812a9b157f7fe84982617e48f71f4e3235482775e5b540"
 dependencies = [
  "anstyle",
  "anstyle-parse",
@@ -52,9 +61,9 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "4.5.0"
+version = "4.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "80c21025abd42669a92efc996ef13cfb2c5c627858421ea58d5c3b331a6c134f"
+checksum = "c918d541ef2913577a0f9566e9ce27cb35b6df072075769e0b26cb5a554520da"
 dependencies = [
  "clap_builder",
  "clap_derive",
@@ -62,9 +71,9 @@ dependencies = [
 
 [[package]]
 name = "clap_builder"
-version = "4.5.0"
+version = "4.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "458bf1f341769dfcf849846f65dffdf9146daa56bcd2a47cb4e1de9915567c99"
+checksum = "9f3e7391dad68afb0c2ede1bf619f579a3dc9c2ec67f089baa397123a2f3d1eb"
 dependencies = [
  "anstream",
  "anstyle",
@@ -96,23 +105,66 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "acbf1af155f9b9ef647e42cdc158db4b64a1b61f743629225fde6f3e0be2a7c7"
 
+[[package]]
+name = "env_filter"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a009aa4810eb158359dda09d0c87378e4bbb89b5a801f016885a4707ba24f7ea"
+dependencies = [
+ "log",
+ "regex",
+]
+
+[[package]]
+name = "env_logger"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c012a26a7f605efc424dd53697843a72be7dc86ad2d01f7814337794a12231d"
+dependencies = [
+ "anstream",
+ "anstyle",
+ "env_filter",
+ "humantime",
+ "log",
+]
+
 [[package]]
 name = "heck"
 version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
 
+[[package]]
+name = "humantime"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a3a5bfb195931eeb336b2a7b4d761daec841b97f947d34394601737a7bba5e4"
+
 [[package]]
 name = "itoa"
 version = "1.0.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b1a46d1a171d865aa5f83f92695765caa047a9b4cbae2cbf37dbd613a793fd4c"
 
+[[package]]
+name = "log"
+version = "0.4.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
+
+[[package]]
+name = "memchr"
+version = "2.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "523dc4f511e55ab87b694dc30d0f820d60906ef06413f93d4d7a1385599cc149"
+
 [[package]]
 name = "pcgtools"
 version = "0.1.0"
 dependencies = [
  "clap",
+ "env_logger",
+ "log",
  "serde",
  "serde_json",
 ]
@@ -135,6 +187,35 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "regex"
+version = "1.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b62dbe01f0b06f9d8dc7d49e05a0785f153b00b2c227856282f671e0318c9b15"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5bb987efffd3c6d0d8f5f89510bb458559eab11e4f869acb20bf845e016259cd"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"
+
 [[package]]
 name = "ryu"
 version = "1.0.16"
diff --git a/Cargo.toml b/Cargo.toml
index 075072b..dcbd9e4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,5 +10,7 @@ description = "pcgtools: tools for reading PCgen PCC and LST data files"
 
 [dependencies]
 clap = { version = "4", features = ["derive"] }
+env_logger = "0.11"
+log = "0.4"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
diff --git a/src/main.rs b/src/main.rs
index b93a39c..d7dcdbb 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,6 +9,7 @@
 // SPDX-License-Identifier: MIT
 
 extern crate clap;
+extern crate log;
 
 use clap::Parser;
 use serde::{Deserialize, Serialize};
@@ -201,12 +202,12 @@ impl Pcc {
         match self.aliases.get(&ident) {
             None => {}
             Some(alias) => {
-                println!("ALIAS MATCH: {} => {}", ident, alias);
+                log::debug!("ALIAS MATCH: {} => {}", ident, alias);
                 ident = alias.clone();
             }
         }
 
-        println!("ID={}, is_mod={}", ident, is_mod);
+        log::debug!("ID={}, is_mod={}", ident, is_mod);
 
         // gather key=value attribs into a list
         let mut attribs: Vec<(String, String)> = Vec::new();
@@ -214,12 +215,12 @@ impl Pcc {
             match token.split_once(':') {
                 None => {
                     if !token.trim().is_empty() {
-                        println!("\t{}", token);
+                        log::debug!("\t{}", token);
                         attribs.push((token.to_string(), String::from("")));
                     }
                 }
                 Some((akey, aval)) => {
-                    println!("\t{}={}", akey, aval);
+                    log::debug!("\t{}={}", akey, aval);
                     attribs.push((akey.to_string(), aval.to_string()));
                 }
             }
@@ -229,12 +230,12 @@ impl Pcc {
         for (key, val) in &attribs {
             match key.as_str() {
                 "ABB" => {
-                    println!("ALIAS: {}={}", val, ident);
+                    log::debug!("ALIAS: {}={}", val, ident);
                     self.aliases.insert(val.to_string(), ident.clone());
                 }
 
                 "KEY" => {
-                    println!("KEY: {}={}", val, ident);
+                    log::debug!("KEY: {}={}", val, ident);
                     ident = val.to_string();
                 }
 
@@ -297,7 +298,7 @@ impl Pcc {
             }
         }
 
-        println!("Pcc.read_lst({}, {}, \"{}\")", pcc_tag, fpath, lstopts);
+        log::debug!("Pcc.read_lst({}, {}, \"{}\")", pcc_tag, fpath, lstopts);
 
         let mut datum;
 
@@ -436,7 +437,7 @@ impl Pcc {
 
         let basedir = dir_from_path(&fpath).unwrap();
 
-        println!("Pcc.read({})", fpath);
+        log::debug!("Pcc.read({})", fpath);
 
         let file = File::open(fpath)?;
         let rdr = BufReader::new(file);
@@ -463,6 +464,8 @@ impl Pcc {
 }
 
 fn main() {
+    env_logger::builder().format_timestamp(None).init();
+
     // parse command line options
     let args = Args::parse();