diff --git a/2015/day-04-2015/Cargo.toml b/2015/day-04-2015/Cargo.toml
index 0fa56f0..2e76c76 100644
--- a/2015/day-04-2015/Cargo.toml
+++ b/2015/day-04-2015/Cargo.toml
@@ -8,4 +8,4 @@ edition = "2018"
 
 [dependencies]
 md5 = "0.7.0"
-rayon = "1.8.1"
+rayon = "1.9.0"
diff --git a/2018/day-05-2018/Cargo.toml b/2018/day-05-2018/Cargo.toml
index 7a1af2a..2ccd4dc 100644
--- a/2018/day-05-2018/Cargo.toml
+++ b/2018/day-05-2018/Cargo.toml
@@ -5,4 +5,4 @@ authors = ["Alberto Leal <mail4alberto@gmail.com>"]
 edition = "2018"
 
 [dependencies]
-rayon = "1.8.1"
+rayon = "1.9.0"
diff --git a/2018/day-11-2018/Cargo.toml b/2018/day-11-2018/Cargo.toml
index 810405b..969179a 100644
--- a/2018/day-11-2018/Cargo.toml
+++ b/2018/day-11-2018/Cargo.toml
@@ -5,4 +5,4 @@ authors = ["Alberto Leal <mail4alberto@gmail.com>"]
 edition = "2018"
 
 [dependencies]
-rayon = "1.8.1"
+rayon = "1.9.0"
diff --git a/2018/day-15-2018/Cargo.toml b/2018/day-15-2018/Cargo.toml
index c1b0646..6f49c6a 100644
--- a/2018/day-15-2018/Cargo.toml
+++ b/2018/day-15-2018/Cargo.toml
@@ -5,4 +5,4 @@ authors = ["Alberto Leal <mail4alberto@gmail.com>"]
 edition = "2018"
 
 [dependencies]
-rayon = "1.8.1"
+rayon = "1.9.0"
diff --git a/2018/day-18-2018/Cargo.toml b/2018/day-18-2018/Cargo.toml
index 24b7510..1462f00 100644
--- a/2018/day-18-2018/Cargo.toml
+++ b/2018/day-18-2018/Cargo.toml
@@ -5,4 +5,4 @@ authors = ["Alberto Leal <mail4alberto@gmail.com>"]
 edition = "2018"
 
 [dependencies]
-rayon = "1.8.1"
+rayon = "1.9.0"
diff --git a/2019/day-02-2019/Cargo.toml b/2019/day-02-2019/Cargo.toml
index ab8ad1e..073c552 100644
--- a/2019/day-02-2019/Cargo.toml
+++ b/2019/day-02-2019/Cargo.toml
@@ -7,4 +7,4 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-rayon = "1.8.1"
+rayon = "1.9.0"
diff --git a/2019/day-04-2019/Cargo.toml b/2019/day-04-2019/Cargo.toml
index dd3093b..2a42bf6 100644
--- a/2019/day-04-2019/Cargo.toml
+++ b/2019/day-04-2019/Cargo.toml
@@ -7,4 +7,4 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-rayon = "1.8.1"
+rayon = "1.9.0"
diff --git a/2023/day-08-2023/Cargo.toml b/2023/day-08-2023/Cargo.toml
index 4269fca..06181a9 100644
--- a/2023/day-08-2023/Cargo.toml
+++ b/2023/day-08-2023/Cargo.toml
@@ -6,5 +6,5 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-rayon = "1.8.1"
+rayon = "1.9.0"
 num = "0.4.1"
\ No newline at end of file
diff --git a/2023/day-12-2023/Cargo.toml b/2023/day-12-2023/Cargo.toml
index c10c9b6..346e25a 100644
--- a/2023/day-12-2023/Cargo.toml
+++ b/2023/day-12-2023/Cargo.toml
@@ -6,4 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-rayon = "1.8.1"
+rayon = "1.9.0"
diff --git a/Cargo.lock b/Cargo.lock
index e03dc7e..e6b8126 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -651,9 +651,9 @@ dependencies = [
 
 [[package]]
 name = "rayon"
-version = "1.8.1"
+version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa7237101a77a10773db45d62004a272517633fbcc3df19d96455ede1122e051"
+checksum = "e4963ed1bc86e4f3ee217022bd855b297cef07fb9eac5dfa1f788b220b49b3bd"
 dependencies = [
  "either",
  "rayon-core",