diff --git a/Cargo.lock b/Cargo.lock
index 57142d1..79ed50d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -76,6 +76,12 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "904dfeac50f3cdaba28fc6f57fdcddb75f49ed61346676a78c4ffe55877802fd"
 
+[[package]]
+name = "base64"
+version = "0.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4a4ddaa51a5bc52a6948f74c06d20aaaddb71924eab79b8c97a8c556e942d6a"
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -98,7 +104,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "99d76085681585d39016f4d3841eb019201fc54d2dd0d92ad1e4fab3bfb32754"
 dependencies = [
  "ahash",
- "base64",
+ "base64 0.13.0",
  "hex",
  "indexmap",
  "lazy_static",
@@ -544,6 +550,12 @@ dependencies = [
  "digest",
 ]
 
+[[package]]
+name = "hmac-sha256"
+version = "1.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc736091aacb31ddaa4cd5f6988b3c21e99913ac846b41f32538c5fae5d71bfe"
+
 [[package]]
 name = "hostname"
 version = "0.3.1"
@@ -709,15 +721,6 @@ dependencies = [
  "wasm-bindgen",
 ]
 
-[[package]]
-name = "keccak"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3afef3b6eff9ce9d8ff9b3601125eec7f0c8cbac7abd14f355d053fa56c98768"
-dependencies = [
- "cpufeatures",
-]
-
 [[package]]
 name = "lazy_static"
 version = "1.4.0"
@@ -835,7 +838,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5a1df476ac9541b0e4fdc8e2cc48884e66c92c933cd17a1fd75e68caf75752e"
 dependencies = [
  "async-trait",
- "base64",
+ "base64 0.13.0",
  "bitflags",
  "bson",
  "chrono",
@@ -1137,7 +1140,7 @@ version = "0.11.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "431949c384f4e2ae07605ccaa56d1d9d2ecdb5cadd4f9577ccfab29f2e5149fc"
 dependencies = [
- "base64",
+ "base64 0.13.0",
  "bytes",
  "encoding_rs",
  "futures-core",
@@ -1186,12 +1189,13 @@ dependencies = [
 name = "revanced-discord-bot"
 version = "2.3.1"
 dependencies = [
+ "base64 0.21.0",
  "bson",
  "chrono",
  "decancer",
  "dirs",
  "dotenv",
- "hex",
+ "hmac-sha256",
  "mongodb",
  "poise",
  "regex",
@@ -1200,7 +1204,6 @@ dependencies = [
  "serde_json",
  "serde_regex",
  "serde_with_macros 2.0.1",
- "sha3",
  "tokio",
  "tracing",
  "tracing-subscriber",
@@ -1258,7 +1261,7 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1ee86d63972a7c661d1536fefe8c3c8407321c3df668891286de28abcd087360"
 dependencies = [
- "base64",
+ "base64 0.13.0",
 ]
 
 [[package]]
@@ -1267,7 +1270,7 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0864aeff53f8c05aa08d86e5ef839d3dfcf07aeba2db32f12db0ef716e87bd55"
 dependencies = [
- "base64",
+ "base64 0.13.0",
 ]
 
 [[package]]
@@ -1428,7 +1431,7 @@ checksum = "82fd5e7b5858ad96e99d440138f34f5b98e1b959ebcd3a1036203b30e78eb788"
 dependencies = [
  "async-trait",
  "async-tungstenite",
- "base64",
+ "base64 0.13.0",
  "bitflags",
  "bytes",
  "cfg-if",
@@ -1474,16 +1477,6 @@ dependencies = [
  "digest",
 ]
 
-[[package]]
-name = "sha3"
-version = "0.10.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bdf0c33fae925bdc080598b84bc15c55e7b9a4a43b3c704da051f977469691c9"
-dependencies = [
- "digest",
- "keccak",
-]
-
 [[package]]
 name = "sharded-slab"
 version = "0.1.4"
@@ -1813,7 +1806,7 @@ version = "0.17.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e27992fd6a8c29ee7eef28fc78349aa244134e10ad447ce3b9f0ac0ed0fa4ce0"
 dependencies = [
- "base64",
+ "base64 0.13.0",
  "byteorder",
  "bytes",
  "http",
diff --git a/Cargo.toml b/Cargo.toml
index 43bc1d4..8316bbc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -32,5 +32,5 @@ chrono = "0.4"
 dirs = "4.0"
 tracing = { version = "0.1", features = ["max_level_debug", "release_max_level_info"] }
 tracing-subscriber = "0.3"
-sha3 = "0.10"
-hex = "0.4"
+hmac-sha256 = "1.1.6"
+base64 = "0.21.0"
diff --git a/src/main.rs b/src/main.rs
index 2f9a8d8..40c6648 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -32,6 +32,7 @@ pub struct Data {
     configuration: Configuration,
     database: Arc<Database>,
     pending_unmutes: HashMap<u64, JoinHandle<Result<(), Error>>>,
+    poll_secret: String,
     api: Api,
 }
 
@@ -83,6 +84,7 @@ async fn main() {
             .unwrap(),
         ),
         pending_unmutes: HashMap::new(),
+        poll_secret: env::var("POLL_SECRET").expect("POLL_SECRET environment variable not set"),
         api: Api::new(
             reqwest::Url::parse(
                 &env::var("API_SERVER").expect("API_SERVER environment variable not set"),
diff --git a/src/utils/poll.rs b/src/utils/poll.rs
index 1e9444b..341ed73 100644
--- a/src/utils/poll.rs
+++ b/src/utils/poll.rs
@@ -1,7 +1,7 @@
 use poise::serenity_prelude::{ButtonStyle, ReactionType, Timestamp};
 
+use base64::Engine;
 use reqwest::StatusCode;
-use sha3::{Digest, Sha3_256};
 use tracing::log::{error, trace};
 
 use super::bot::get_data_lock;
@@ -24,12 +24,11 @@ pub async fn handle_poll(
 
     let eligible = member.joined_at.unwrap() <= min_join_date;
     let result = if eligible {
-        let mut hasher = Sha3_256::new();
-        hasher.update(&member.user.id.to_string());
         match data
             .api
-            // We cannot use the entire hash because Discord rejects URLs with more than 512 characters.
-            .authenticate(&hex::encode(hasher.finalize())[..2^5])
+            .authenticate(&base64::engine::general_purpose::STANDARD_NO_PAD.encode(
+                hmac_sha256::HMAC::mac(member.user.id.to_string(), &data.poll_secret),
+            ))
             .await
         {
             Ok(auth) => Ok(auth.access_token),