diff --git a/Cargo.lock b/Cargo.lock
index 6918b30..a319d88 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -6,7 +6,7 @@ version = 4
 name = "add_one"
 version = "0.1.0"
 dependencies = [
- "rand 0.8.5",
+ "rand 0.9.1",
 ]
 
 [[package]]
@@ -18,7 +18,7 @@ name = "adder_ws"
 version = "0.1.0"
 dependencies = [
  "add_one",
- "rand 0.8.5",
+ "rand 0.9.1",
 ]
 
 [[package]]
@@ -1780,6 +1780,18 @@ dependencies = [
  "wasi 0.11.0+wasi-snapshot-preview1",
 ]
 
+[[package]]
+name = "getrandom"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73fea8450eea4bac3940448fb7ae50d91f034f941199fcd9d909a5a07aa455f0"
+dependencies = [
+ "cfg-if 1.0.0",
+ "libc",
+ "r-efi",
+ "wasi 0.14.2+wasi-0.2.4",
+]
+
 [[package]]
 name = "ghash"
 version = "0.3.1"
@@ -1822,7 +1834,7 @@ dependencies = [
 name = "guessing_game"
 version = "0.1.0"
 dependencies = [
- "rand 0.8.5",
+ "rand 0.9.1",
 ]
 
 [[package]]
@@ -3015,6 +3027,12 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "r-efi"
+version = "5.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "74765f6d916ee2faa39bc8e68e4f3ed8949b48cccdac59983d287a7cb71ce9c5"
+
 [[package]]
 name = "rand"
 version = "0.7.3"
@@ -3039,6 +3057,16 @@ dependencies = [
  "rand_core 0.6.4",
 ]
 
+[[package]]
+name = "rand"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9fbfd9d094a40bf3ae768db9361049ace4c0e04a4fd6b359518bd7b73a73dd97"
+dependencies = [
+ "rand_chacha 0.9.0",
+ "rand_core 0.9.3",
+]
+
 [[package]]
 name = "rand_chacha"
 version = "0.2.2"
@@ -3059,6 +3087,16 @@ dependencies = [
  "rand_core 0.6.4",
 ]
 
+[[package]]
+name = "rand_chacha"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3022b5f1df60f26e1ffddd6c66e8aa15de382ae63b3a0c1bfc0e4d3e3f325cb"
+dependencies = [
+ "ppv-lite86",
+ "rand_core 0.9.3",
+]
+
 [[package]]
 name = "rand_core"
 version = "0.5.1"
@@ -3077,6 +3115,15 @@ dependencies = [
  "getrandom 0.2.15",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "99d9a13982dcf210057a8a78572b2217b667c3beacbf3a0d8b454f6f82837d38"
+dependencies = [
+ "getrandom 0.3.2",
+]
+
 [[package]]
 name = "rand_hc"
 version = "0.2.0"
@@ -4554,6 +4601,15 @@ version = "0.11.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
 
+[[package]]
+name = "wasi"
+version = "0.14.2+wasi-0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9683f9a5a998d873c0d21fcbe3c083009670149a8fab228644b8bd36b2c48cb3"
+dependencies = [
+ "wit-bindgen-rt",
+]
+
 [[package]]
 name = "wasm-bindgen"
 version = "0.2.92"
@@ -4879,6 +4935,15 @@ version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
 
+[[package]]
+name = "wit-bindgen-rt"
+version = "0.39.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f42320e61fe2cfd34354ecb597f86f413484a798ba44a8ca1165c58d42da6c1"
+dependencies = [
+ "bitflags 2.6.0",
+]
+
 [[package]]
 name = "workday"
 version = "0.1.0"
diff --git a/workspace/add_one/Cargo.toml b/workspace/add_one/Cargo.toml
index 0dee74e..c055058 100644
--- a/workspace/add_one/Cargo.toml
+++ b/workspace/add_one/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]
-rand = "0.8.5"
+rand = "0.9.1"
diff --git a/workspace/adder_ws/Cargo.toml b/workspace/adder_ws/Cargo.toml
index a14d2c9..b3d4792 100644
--- a/workspace/adder_ws/Cargo.toml
+++ b/workspace/adder_ws/Cargo.toml
@@ -7,4 +7,4 @@ edition = "2021"
 
 [dependencies]
 add_one = { path = "../add_one" }
-rand = "0.8.4"
+rand = "0.9.1"
diff --git a/workspace/guessing_game/Cargo.toml b/workspace/guessing_game/Cargo.toml
index 7eda67a..5d97832 100644
--- a/workspace/guessing_game/Cargo.toml
+++ b/workspace/guessing_game/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]
-rand = "0.8.5"
+rand = "0.9.1"