diff --git a/Cargo.lock b/Cargo.lock
index ba88825b0..f160e82d4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,15 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "aho-corasick"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c378d78423fdad8089616f827526ee33c19f2fddbd5de1629152c9593ba4783"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "anstream"
 version = "0.5.0"
@@ -91,20 +100,19 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "clap"
-version = "4.4.0"
+version = "4.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1d5f1946157a96594eb2d2c10eb7ad9a2b27518cb3000209dec700c35df9197d"
+checksum = "6a13b88d2c62ff462f88e4a121f17a82c1af05693a2f192b5c38d14de73c19f6"
 dependencies = [
  "clap_builder",
  "clap_derive",
- "once_cell",
 ]
 
 [[package]]
 name = "clap_builder"
-version = "4.4.0"
+version = "4.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "78116e32a042dd73c2901f0dc30790d20ff3447f3e3472fad359e8c3d282bcd6"
+checksum = "2bb9faaa7c2ef94b2743a21f5a29e6f0010dff4caa69ac8e9d6cf8b6fa74da08"
 dependencies = [
  "anstream",
  "anstyle",
@@ -114,9 +122,9 @@ dependencies = [
 
 [[package]]
 name = "clap_derive"
-version = "4.4.0"
+version = "4.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c9fd1a5729c4548118d7d70ff234a44868d00489a4b6597b0b020918a0e91a1a"
+checksum = "0862016ff20d69b84ef8247369fabf5c008a7417002411897d40ee1f4532b873"
 dependencies = [
  "heck",
  "proc-macro2",
@@ -174,6 +182,19 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c34f04666d835ff5d62e058c3995147c06f42fe86ff053337632bca83e42702d"
 
+[[package]]
+name = "env_logger"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85cdab6a89accf66733ad5a1693a4dcced6aeff64602b634530dd73c1f3ee9f0"
+dependencies = [
+ "humantime",
+ "is-terminal",
+ "log",
+ "regex",
+ "termcolor",
+]
+
 [[package]]
 name = "equivalent"
 version = "1.0.1"
@@ -182,9 +203,9 @@ checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
 
 [[package]]
 name = "errno"
-version = "0.3.2"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6b30f669a7961ef1631673d2766cc92f52d64f7ef354d4fe0ddfd30ed52f0f4f"
+checksum = "136526188508e25c6fef639d7927dfb3e0e3084488bf202267829cf7fc23dbdd"
 dependencies = [
  "errno-dragonfly",
  "libc",
@@ -251,6 +272,12 @@ version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
 
+[[package]]
+name = "hermit-abi"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "443144c8cdadd93ebf52ddb4056d257f5b52c04d3c804e657d19eb73fc33668b"
+
 [[package]]
 name = "home"
 version = "0.5.5"
@@ -260,6 +287,12 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "humantime"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a3a5bfb195931eeb336b2a7b4d761daec841b97f947d34394601737a7bba5e4"
+
 [[package]]
 name = "indexmap"
 version = "2.0.0"
@@ -270,6 +303,17 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "is-terminal"
+version = "0.4.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cb0889898416213fab133e1d33a0e5858a48177452750691bde3666d0fdbaf8b"
+dependencies = [
+ "hermit-abi",
+ "rustix",
+ "windows-sys",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.147"
@@ -283,6 +327,7 @@ dependencies = [
  "anyhow",
  "clap",
  "dirs",
+ "env_logger",
  "lig_core",
  "rustyline",
 ]
@@ -302,6 +347,7 @@ version = "0.0.0"
 dependencies = [
  "anyhow",
  "fallible-iterator",
+ "log",
  "sqlite3-parser",
 ]
 
@@ -319,9 +365,9 @@ checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 
 [[package]]
 name = "memchr"
-version = "2.5.0"
+version = "2.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
+checksum = "5486aed0026218e61b8a01d5fbd5a0a134649abb71a0e53b7bc088529dced86e"
 
 [[package]]
 name = "nibble_vec"
@@ -334,14 +380,13 @@ dependencies = [
 
 [[package]]
 name = "nix"
-version = "0.26.2"
+version = "0.26.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bfdda3d196821d6af13126e40375cdf7da646a96114af134d5f417a9a1dc8e1a"
+checksum = "598beaf3cc6fdd9a5dfb1630c2800c7acd31df7aaf0f565796fba2b53ca1af1b"
 dependencies = [
  "bitflags 1.3.2",
  "cfg-if",
  "libc",
- "static_assertions",
 ]
 
 [[package]]
@@ -459,10 +504,39 @@ dependencies = [
 ]
 
 [[package]]
-name = "rustix"
-version = "0.38.9"
+name = "regex"
+version = "1.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9bfe0f2582b4931a45d1fa608f8a8722e8b3c7ac54dd6d5f3b3212791fedef49"
+checksum = "12de2eff854e5fa4b1295edd650e227e9d8fb0c9e90b12e7f36d6a6811791a29"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49530408a136e16e5b486e883fbb6ba058e8e4e8ae6621a77b048b314336e629"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.7.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dbb5fb1acd8a1a18b3dd5be62d25485eb770e05afb408a9627d14d451bae12da"
+
+[[package]]
+name = "rustix"
+version = "0.38.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0c3dde1fc030af041adc40e79c0e7fbcf431dd24870053d187d7c66e4b87453"
 dependencies = [
  "bitflags 2.4.0",
  "errno",
@@ -531,12 +605,6 @@ dependencies = [
  "uncased",
 ]
 
-[[package]]
-name = "static_assertions"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
-
 [[package]]
 name = "str-buf"
 version = "1.0.6"
@@ -560,6 +628,15 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "termcolor"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "be55cf8942feac5c765c2c993422806843c9a9a45d4d5c407ad6dd2ea95eb9b6"
+dependencies = [
+ "winapi-util",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.47"
@@ -695,6 +772,15 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
diff --git a/cli/Cargo.toml b/cli/Cargo.toml
index cde2bdf1d..42cbc77b6 100644
--- a/cli/Cargo.toml
+++ b/cli/Cargo.toml
@@ -18,5 +18,6 @@ path = "main.rs"
 anyhow = "1.0.75"
 clap = { version = "4.4.0", features = ["derive"] }
 dirs = "5.0.1"
+env_logger = "0.10.0"
 lig_core = { path = "../core" }
 rustyline = "12.0.0"
diff --git a/cli/main.rs b/cli/main.rs
index 1735eb69a..cce7f6c84 100644
--- a/cli/main.rs
+++ b/cli/main.rs
@@ -16,6 +16,7 @@ struct Opts {
 }
 
 fn main() -> anyhow::Result<()> {
+    env_logger::init();
     let opts = Opts::parse();
     let io = IO::new();
     let db = Database::open(Arc::new(io), opts.database.to_str().unwrap())?;
diff --git a/core/Cargo.toml b/core/Cargo.toml
index babb1eb2b..43d25989e 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -16,4 +16,5 @@ path = "lib.rs"
 [dependencies]
 anyhow = "1.0.75"
 fallible-iterator = "0.3.0"
+log = "0.4.20"
 sqlite3-parser = "0.11.0"
diff --git a/core/lib.rs b/core/lib.rs
index 139d87d38..e5bd5f8a5 100644
--- a/core/lib.rs
+++ b/core/lib.rs
@@ -59,7 +59,7 @@ impl Connection {
                                 for i in 0..program.column_count() {
                                     row.push(program.column(i).unwrap().to_string());
                                 }
-                                println!("Row = {:?}", row);
+                                log::trace!("Row = {:?}", row);
                             }
                             vdbe::StepResult::IO => todo!(),
                             vdbe::StepResult::Done => break,
diff --git a/core/vdbe.rs b/core/vdbe.rs
index d27c35ba4..cf6a4a6c8 100644
--- a/core/vdbe.rs
+++ b/core/vdbe.rs
@@ -136,7 +136,7 @@ impl Program {
     pub fn step(&mut self) -> Result<StepResult> {
         loop {
             let insn = &self.insns[self.pc];
-            print_insn(self.pc, insn);
+            trace_insn(self.pc, insn);
             match insn {
                 Insn::Init(init) => {
                     self.pc = init.target_pc;
@@ -288,7 +288,17 @@ fn translate_select(pager: Arc<Pager>, schema: &Schema, select: Select) -> Resul
     }
 }
 
+fn trace_insn(addr: usize, insn: &Insn) {
+    let s = insn_to_str(addr, insn);
+    log::trace!("{}", s);
+}
+
 fn print_insn(addr: usize, insn: &Insn) {
+    let s = insn_to_str(addr, insn);
+    println!("{}", s);
+}
+
+fn insn_to_str(addr: usize, insn: &Insn) -> String {
     let (opcode, p1, p2, p3, p4, p5, comment) = match insn {
         Insn::Init(init) => (
             "Init",
@@ -343,8 +353,8 @@ fn print_insn(addr: usize, insn: &Insn) {
         Insn::Transaction => ("Transaction", 0, 0, 0, "", 0, "".to_string()),
         Insn::Goto(goto) => ("Goto", 0, goto.target_pc, 0, "", 0, "".to_string()),
     };
-    println!(
+    format!(
         "{:<4}  {:<13}  {:<4}  {:<4}  {:<4}  {:<13}  {:<2}  {}",
         addr, opcode, p1, p2, p3, p4, p5, comment
-    );
+    )
 }