diff --git a/Cargo.lock b/Cargo.lock
index fc4faa7c..d7822a44 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2674,7 +2674,6 @@ dependencies = [
  "annotate-snippets",
  "enum-iterator",
  "insta",
- "lazy_static",
  "line-index",
  "rowan",
  "rustc-hash 2.1.1",
diff --git a/Cargo.toml b/Cargo.toml
index bf3e6b08..ca21076d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,6 @@ console = "0.11.3"
 glob = "0.3.1"
 insta = "1.39.0"
 jsonwebtoken = { version = "10.3.0", features = ["rust_crypto"] }
-lazy_static = "1.5.0"
 log = "0.4.25"
 reqwest = { version = "0.11.27", features = ["native-tls-vendored", "blocking", "json"] }
 la-arena = "0.3.1"
diff --git a/crates/squawk_linter/Cargo.toml b/crates/squawk_linter/Cargo.toml
index 269d778a..3c2ed994 100644
--- a/crates/squawk_linter/Cargo.toml
+++ b/crates/squawk_linter/Cargo.toml
@@ -18,7 +18,6 @@ squawk-syntax.workspace = true
 
 rowan.workspace = true
 serde.workspace = true
-lazy_static.workspace = true
 insta.workspace = true
 enum-iterator.workspace = true
 line-index.workspace = true
diff --git a/crates/squawk_linter/src/rules/adding_field_with_default.rs b/crates/squawk_linter/src/rules/adding_field_with_default.rs
index aeb1288e..61404f05 100644
--- a/crates/squawk_linter/src/rules/adding_field_with_default.rs
+++ b/crates/squawk_linter/src/rules/adding_field_with_default.rs
@@ -1,4 +1,5 @@
-use lazy_static::lazy_static;
+use std::sync::OnceLock;
+
 use rustc_hash::FxHashSet;
 
 use squawk_syntax::ast::AstNode;
@@ -7,15 +8,16 @@ use squawk_syntax::{ast, identifier::Identifier};
 
 use crate::{Linter, Rule, Version, Violation};
 
-lazy_static! {
-    static ref NON_VOLATILE_FUNCS: FxHashSet<Identifier> = {
+fn non_volatile_funcs() -> &'static FxHashSet<Identifier> {
+    static NON_VOLATILE_FUNCS: OnceLock<FxHashSet<Identifier>> = OnceLock::new();
+    NON_VOLATILE_FUNCS.get_or_init(|| {
         NON_VOLATILE_BUILT_IN_FUNCTIONS
             .split('\n')
             .map(|x| x.trim())
             .filter(|x| !x.is_empty())
             .map(Identifier::new)
             .collect()
-    };
+    })
 }
 
 fn is_non_volatile_or_const(expr: &ast::Expr) -> bool {
@@ -40,7 +42,7 @@ fn is_non_volatile_or_const(expr: &ast::Expr) -> bool {
                 };
 
                 let non_volatile_name =
-                    NON_VOLATILE_FUNCS.contains(&Identifier::new(name_ref.text().as_str()));
+                    non_volatile_funcs().contains(&Identifier::new(name_ref.text().as_str()));
 
                 no_args && non_volatile_name
             } else {
diff --git a/crates/squawk_linter/src/rules/ban_char_field.rs b/crates/squawk_linter/src/rules/ban_char_field.rs
index 02fc8768..25425a7f 100644
--- a/crates/squawk_linter/src/rules/ban_char_field.rs
+++ b/crates/squawk_linter/src/rules/ban_char_field.rs
@@ -10,20 +10,21 @@ use squawk_syntax::{
 use crate::visitors::check_not_allowed_types;
 use crate::{Edit, Fix, Linter, Rule, Violation};
 
-use lazy_static::lazy_static;
-
-lazy_static! {
-    static ref CHAR_TYPES: FxHashSet<Identifier> = [
-        Identifier::new("char"),
-        Identifier::new("character"),
-        Identifier::new("bpchar"),
-    ]
-    .into_iter()
-    .collect();
+use std::sync::OnceLock;
+
+fn char_types() -> &'static FxHashSet<Identifier> {
+    static CHAR_TYPES: OnceLock<FxHashSet<Identifier>> = OnceLock::new();
+    CHAR_TYPES.get_or_init(|| {
+        FxHashSet::from_iter([
+            Identifier::new("char"),
+            Identifier::new("character"),
+            Identifier::new("bpchar"),
+        ])
+    })
 }
 
 fn is_char_type(x: TokenText<'_>) -> bool {
-    CHAR_TYPES.contains(&Identifier::new(x.as_ref()))
+    char_types().contains(&Identifier::new(x.as_ref()))
 }
 
 fn create_fix(range: TextRange, args: Option<ast::ArgList>) -> Fix {
diff --git a/crates/squawk_linter/src/rules/prefer_bigint_over_int.rs b/crates/squawk_linter/src/rules/prefer_bigint_over_int.rs
index e1bcfa32..dc07c26c 100644
--- a/crates/squawk_linter/src/rules/prefer_bigint_over_int.rs
+++ b/crates/squawk_linter/src/rules/prefer_bigint_over_int.rs
@@ -8,18 +8,19 @@ use crate::{Edit, Fix, Linter, Rule, Violation};
 use crate::visitors::check_not_allowed_types;
 use crate::visitors::is_not_valid_int_type;
 
-use lazy_static::lazy_static;
-
-lazy_static! {
-    static ref INT_TYPES: FxHashSet<Identifier> = [
-        Identifier::new("int"),
-        Identifier::new("integer"),
-        Identifier::new("int4"),
-        Identifier::new("serial"),
-        Identifier::new("serial4"),
-    ]
-    .into_iter()
-    .collect();
+use std::sync::OnceLock;
+
+fn int_types() -> &'static FxHashSet<Identifier> {
+    static INT_TYPES: OnceLock<FxHashSet<Identifier>> = OnceLock::new();
+    INT_TYPES.get_or_init(|| {
+        FxHashSet::from_iter([
+            Identifier::new("int"),
+            Identifier::new("integer"),
+            Identifier::new("int4"),
+            Identifier::new("serial"),
+            Identifier::new("serial4"),
+        ])
+    })
 }
 
 fn int_to_bigint_replacement(int_type: &str) -> &'static str {
@@ -44,7 +45,7 @@ fn create_bigint_fix(ty: &ast::Type) -> Option<Fix> {
 
 fn check_ty_for_big_int(ctx: &mut Linter, ty: Option<ast::Type>) {
     if let Some(ty) = ty {
-        if is_not_valid_int_type(&ty, &INT_TYPES) {
+        if is_not_valid_int_type(&ty, int_types()) {
             let fix = create_bigint_fix(&ty);
 
             ctx.report(
diff --git a/crates/squawk_linter/src/rules/prefer_bigint_over_smallint.rs b/crates/squawk_linter/src/rules/prefer_bigint_over_smallint.rs
index 4f88cac9..9791bf97 100644
--- a/crates/squawk_linter/src/rules/prefer_bigint_over_smallint.rs
+++ b/crates/squawk_linter/src/rules/prefer_bigint_over_smallint.rs
@@ -8,17 +8,18 @@ use crate::{Edit, Fix, Linter, Rule, Violation};
 use crate::visitors::check_not_allowed_types;
 use crate::visitors::is_not_valid_int_type;
 
-use lazy_static::lazy_static;
-
-lazy_static! {
-    static ref SMALL_INT_TYPES: FxHashSet<Identifier> = [
-        Identifier::new("smallint"),
-        Identifier::new("int2"),
-        Identifier::new("smallserial"),
-        Identifier::new("serial2"),
-    ]
-    .into_iter()
-    .collect();
+use std::sync::OnceLock;
+
+fn small_int_types() -> &'static FxHashSet<Identifier> {
+    static SMALL_INT_TYPES: OnceLock<FxHashSet<Identifier>> = OnceLock::new();
+    SMALL_INT_TYPES.get_or_init(|| {
+        FxHashSet::from_iter([
+            Identifier::new("smallint"),
+            Identifier::new("int2"),
+            Identifier::new("smallserial"),
+            Identifier::new("serial2"),
+        ])
+    })
 }
 
 fn smallint_to_bigint(smallint_type: &str) -> &'static str {
@@ -43,7 +44,7 @@ fn create_bigint_fix(ty: &ast::Type) -> Option<Fix> {
 
 fn check_ty_for_small_int(ctx: &mut Linter, ty: Option<ast::Type>) {
     if let Some(ty) = ty {
-        if is_not_valid_int_type(&ty, &SMALL_INT_TYPES) {
+        if is_not_valid_int_type(&ty, small_int_types()) {
             let fix = create_bigint_fix(&ty);
 
             ctx.report(
diff --git a/crates/squawk_linter/src/rules/prefer_identity.rs b/crates/squawk_linter/src/rules/prefer_identity.rs
index 868902ba..78173485 100644
--- a/crates/squawk_linter/src/rules/prefer_identity.rs
+++ b/crates/squawk_linter/src/rules/prefer_identity.rs
@@ -8,21 +8,22 @@ use squawk_syntax::{
 
 use crate::{Edit, Fix, Linter, Rule, Violation};
 
-use lazy_static::lazy_static;
+use std::sync::OnceLock;
 
 use crate::visitors::{check_not_allowed_types, is_not_valid_int_type};
 
-lazy_static! {
-    static ref SERIAL_TYPES: FxHashSet<Identifier> = [
-        Identifier::new("serial"),
-        Identifier::new("serial2"),
-        Identifier::new("serial4"),
-        Identifier::new("serial8"),
-        Identifier::new("smallserial"),
-        Identifier::new("bigserial"),
-    ]
-    .into_iter()
-    .collect();
+fn serial_types() -> &'static FxHashSet<Identifier> {
+    static SERIAL_TYPES: OnceLock<FxHashSet<Identifier>> = OnceLock::new();
+    SERIAL_TYPES.get_or_init(|| {
+        FxHashSet::from_iter([
+            Identifier::new("serial"),
+            Identifier::new("serial2"),
+            Identifier::new("serial4"),
+            Identifier::new("serial8"),
+            Identifier::new("smallserial"),
+            Identifier::new("bigserial"),
+        ])
+    })
 }
 
 fn replace_serial(serial_type: &str) -> &'static str {
@@ -43,7 +44,7 @@ fn create_identity_fix(ty: &ast::Type) -> Option<Fix> {
 
 fn check_ty_for_serial(ctx: &mut Linter, ty: Option<ast::Type>) {
     if let Some(ty) = ty {
-        if is_not_valid_int_type(&ty, &SERIAL_TYPES) {
+        if is_not_valid_int_type(&ty, serial_types()) {
             let fix = create_identity_fix(&ty);
 
             ctx.report(
diff --git a/crates/squawk_linter/src/rules/prefer_text_field.rs b/crates/squawk_linter/src/rules/prefer_text_field.rs
index ec4d6c42..6139fe18 100644
--- a/crates/squawk_linter/src/rules/prefer_text_field.rs
+++ b/crates/squawk_linter/src/rules/prefer_text_field.rs
@@ -1,5 +1,3 @@
-use rustc_hash::FxHashSet;
-
 use squawk_syntax::{
     Parse, SourceFile,
     ast::{self, AstNode},
@@ -10,12 +8,6 @@ use crate::{Edit, Fix, Linter, Rule, Violation};
 
 use crate::visitors::check_not_allowed_types;
 
-use lazy_static::lazy_static;
-
-lazy_static! {
-    static ref VARCHAR_TYPE_NAMES: FxHashSet<&'static str> = ["varchar"].into_iter().collect();
-}
-
 fn is_not_allowed_varchar(ty: &ast::Type) -> bool {
     match ty {
         ast::Type::ArrayType(array_type) => {