diff --git a/Cargo.lock b/Cargo.lock
index 486162301..641659a1d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -928,7 +928,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "strsim 0.11.1",
- "syn 2.0.66",
+ "syn 2.0.87",
 ]
 
 [[package]]
@@ -950,7 +950,7 @@ checksum = "d336a2a514f6ccccaa3e09b02d41d35330c07ddf03a62165fcec10bb561c7806"
 dependencies = [
  "darling_core 0.20.10",
  "quote",
- "syn 2.0.66",
+ "syn 2.0.87",
 ]
 
 [[package]]
@@ -1059,7 +1059,7 @@ dependencies = [
  "darling 0.20.10",
  "proc-macro2",
  "quote",
- "syn 2.0.66",
+ "syn 2.0.87",
 ]
 
 [[package]]
@@ -1069,7 +1069,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ab63b0e2bf4d5928aff72e83a7dace85d7bba5fe12dcc3c5a572d78caffd3f3c"
 dependencies = [
  "derive_builder_core 0.20.2",
- "syn 2.0.66",
+ "syn 2.0.87",
 ]
 
 [[package]]
@@ -2518,9 +2518,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.19.0"
+version = "1.20.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
+checksum = "1261fe7e33c73b354eab43b1273a57c8f967d0391e80353e51f764ac02cf6775"
 
 [[package]]
 name = "openssl"
diff --git a/cli/Cargo.toml b/cli/Cargo.toml
index b178b1562..79daf9c7b 100644
--- a/cli/Cargo.toml
+++ b/cli/Cargo.toml
@@ -16,7 +16,7 @@ path = "src/main.rs"
 check-if-email-exists = { path = "../core" }
 clap = { version = "3.2", features = ["derive", "env"] }
 env_logger = "0.11"
-once_cell = "1.19"
+once_cell = "1.20"
 openssl = { version = "0.10", features = ["vendored"] }
 serde = "1.0"
 serde_json = "1.0"
diff --git a/core/Cargo.toml b/core/Cargo.toml
index 4c2593d60..a754823a0 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -28,7 +28,7 @@ levenshtein = "1.0.5"
 log = "0.4.22"
 mailchecker = "6.0.11"
 md5 = "0.7.0"
-once_cell = "1.19.0"
+once_cell = "1.20.2"
 pwned = "0.5.0"
 rand = { version = "0.8.5", features = ["small_rng"] }
 regex = "1.11.1"