diff --git a/refinery_core/Cargo.toml b/refinery_core/Cargo.toml
index ed43f595..e32f4325 100644
--- a/refinery_core/Cargo.toml
+++ b/refinery_core/Cargo.toml
@@ -20,7 +20,6 @@ mysql_async = ["dep:mysql_async"]
 async-trait = "0.1"
 cfg-if = "1.0"
 log = "0.4"
-once_cell = "1"
 regex = "1"
 serde = { version = "1", features = ["derive"] }
 siphasher = "1.0"
diff --git a/refinery_core/src/runner.rs b/refinery_core/src/runner.rs
index 80319659..76c7793b 100644
--- a/refinery_core/src/runner.rs
+++ b/refinery_core/src/runner.rs
@@ -1,4 +1,3 @@
-use once_cell::sync::Lazy;
 use regex::Regex;
 use siphasher::sip::SipHasher13;
 use time::OffsetDateTime;
@@ -6,6 +5,7 @@ use time::OffsetDateTime;
 use std::cmp::Ordering;
 use std::fmt;
 use std::hash::{Hash, Hasher};
+use std::sync::OnceLock;
 
 use crate::error::Kind;
 use crate::traits::DEFAULT_MIGRATION_TABLE_NAME;
@@ -13,12 +13,11 @@ use crate::{AsyncMigrate, Error, Migrate};
 use std::fmt::Formatter;
 
 // regex used to match file names
-pub fn file_match_re() -> Regex {
-    Regex::new(r"^([U|V])(\d+(?:\.\d+)?)__(\w+)").unwrap()
+pub fn file_match_re() -> &'static Regex {
+    static RE: OnceLock<regex::Regex> = OnceLock::new();
+    RE.get_or_init(|| Regex::new(r"^([U|V])(\d+(?:\.\d+)?)__(\w+)").unwrap())
 }
 
-pub(crate) static RE: Lazy<regex::Regex> = Lazy::new(file_match_re);
-
 /// An enum set that represents the type of the Migration
 #[derive(Clone, PartialEq)]
 pub enum Type {
@@ -83,7 +82,7 @@ impl Migration {
     /// Create an unapplied migration, name and version are parsed from the input_name,
     /// which must be named in the format (U|V){1}__{2}.rs where {1} represents the migration version and {2} the name.
     pub fn unapplied(input_name: &str, sql: &str) -> Result<Migration, Error> {
-        let captures = RE
+        let captures = file_match_re()
             .captures(input_name)
             .filter(|caps| caps.len() == 4)
             .ok_or_else(|| Error::new(Kind::InvalidName, None))?;
diff --git a/refinery_core/src/util.rs b/refinery_core/src/util.rs
index cdc58c8f..5992aab3 100644
--- a/refinery_core/src/util.rs
+++ b/refinery_core/src/util.rs
@@ -1,13 +1,9 @@
 use crate::error::{Error, Kind};
-use once_cell::sync::Lazy;
 use regex::Regex;
 use std::ffi::OsStr;
 use std::path::{Path, PathBuf};
 use walkdir::{DirEntry, WalkDir};
 
-pub(crate) static RE: Lazy<regex::Regex> =
-    Lazy::new(|| Regex::new(r"^(U|V)(\d+(?:\.\d+)?)__\w+\.(rs|sql)$").unwrap());
-
 /// enum containing the migration types used to search for migrations
 /// either just .sql files or both .sql and .rs
 pub enum MigrationType {