diff --git a/Cargo.lock b/Cargo.lock
index 82a2484c50..fdba2ed73f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -28,6 +28,17 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "ahash"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c99f64d1e06488f620f932677e24bc6e2897582980441ae90a671415bd7ec2f"
+dependencies = [
+ "cfg-if 1.0.0",
+ "once_cell",
+ "version_check",
+]
+
 [[package]]
 name = "aho-corasick"
 version = "0.7.20"
@@ -1593,7 +1604,7 @@ version = "0.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ab5ef0d4909ef3724cc8cce6ccc8572c5c817592e9285f5464f8e86f8bd3726e"
 dependencies = [
- "ahash",
+ "ahash 0.7.6",
 ]
 
 [[package]]
@@ -1602,7 +1613,7 @@ version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
 dependencies = [
- "ahash",
+ "ahash 0.7.6",
 ]
 
 [[package]]
@@ -1610,6 +1621,9 @@ name = "hashbrown"
 version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "43a3c133739dddd0d2990f9a4bdf8eb4b21ef50e4851ca85ab661199821d510e"
+dependencies = [
+ "ahash 0.8.3",
+]
 
 [[package]]
 name = "heapless"
@@ -3173,10 +3187,11 @@ dependencies = [
 
 [[package]]
 name = "regress"
-version = "0.4.1"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0a92ff21fe8026ce3f2627faaf43606f0b67b014dbc9ccf027181a804f75d92e"
+checksum = "d995d590bd8ec096d1893f414bf3f5e8b0ee4c9eed9a5642b9766ef2c8e2e8e9"
 dependencies = [
+ "hashbrown 0.13.2",
  "memchr",
 ]
 
diff --git a/boa_engine/Cargo.toml b/boa_engine/Cargo.toml
index 20dc536381..3a1491a6e1 100644
--- a/boa_engine/Cargo.toml
+++ b/boa_engine/Cargo.toml
@@ -47,7 +47,7 @@ serde = { version = "1.0.154", features = ["derive", "rc"] }
 serde_json = "1.0.94"
 rand = "0.8.5"
 num-traits = "0.2.15"
-regress = "0.4.1"
+regress = "0.5.0"
 rustc-hash = "1.1.0"
 num-bigint = { version = "0.4.3", features = ["serde"] }
 num-integer = "0.1.45"
diff --git a/boa_engine/src/builtins/regexp/tests.rs b/boa_engine/src/builtins/regexp/tests.rs
index 95aa3f6a94..588cf45756 100644
--- a/boa_engine/src/builtins/regexp/tests.rs
+++ b/boa_engine/src/builtins/regexp/tests.rs
@@ -113,20 +113,9 @@ fn to_string() {
         TestAction::assert_eq("(new RegExp('bar', 'g')).toString()", "/bar/g"),
         TestAction::assert_eq(r"(new RegExp('\\n', 'g')).toString()", r"/\n/g"),
         TestAction::assert_eq(r"/\n/g.toString()", r"/\n/g"),
+        TestAction::assert_eq(r"/,\;/.toString()", r"/,\;/"),
     ]);
 }
-
-#[test]
-fn no_panic_on_invalid_character_escape() {
-    // This used to panic, we now return an error
-    // The line below should not cause Boa to panic
-    run_test_actions([TestAction::assert_native_error(
-        r"const a = /,\;/",
-        ErrorKind::Syntax,
-        "Invalid regular expression literal: Invalid character escape at position: 1:11",
-    )]);
-}
-
 #[test]
 fn search() {
     const ERROR: &str = "RegExp.prototype[Symbol.search] method called on incompatible value";
diff --git a/boa_parser/Cargo.toml b/boa_parser/Cargo.toml
index f08c366de2..f9659909b9 100644
--- a/boa_parser/Cargo.toml
+++ b/boa_parser/Cargo.toml
@@ -21,4 +21,4 @@ fast-float = "0.2.0"
 num-traits = "0.2.15"
 bitflags = "1.3.2"
 num-bigint = "0.4.3"
-regress = "0.4.1"
+regress = "0.5.0"