diff --git a/Cargo.toml b/Cargo.toml
index 39d2c600..12c6f30b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,7 +28,7 @@ hyperx = "1.3.0"
 snafu = { version = "0.7", features = ["backtraces"] }
 once_cell = "1.7.2"
 arc-swap = "1.3.0"
-base64 = "0.20.0"
+base64 = "0.21.0"
 bytes = "1.0.1"
 jsonwebtoken = "8"
 futures-core = { version = "0.3.15", optional = true }
diff --git a/src/api/repos.rs b/src/api/repos.rs
index 3cf5eb6c..ca008a10 100644
--- a/src/api/repos.rs
+++ b/src/api/repos.rs
@@ -240,11 +240,12 @@ impl<'octo> RepoHandler<'octo> {
         message: impl Into<String>,
         content: impl AsRef<[u8]>,
     ) -> UpdateFileBuilder<'_, '_> {
+        use base64::Engine;
         UpdateFileBuilder::new(
             self,
             path.into(),
             message.into(),
-            base64::encode(content),
+            base64::prelude::BASE64_STANDARD.encode(content),
             None,
         )
     }
@@ -284,11 +285,12 @@ impl<'octo> RepoHandler<'octo> {
         content: impl AsRef<[u8]>,
         sha: impl Into<String>,
     ) -> UpdateFileBuilder<'_, '_> {
+        use base64::Engine;
         UpdateFileBuilder::new(
             self,
             path.into(),
             message.into(),
-            base64::encode(content),
+            base64::prelude::BASE64_STANDARD.encode(content),
             Some(sha.into()),
         )
     }
diff --git a/src/models/events/payload/pull_request_review.rs b/src/models/events/payload/pull_request_review.rs
index ff603679..30ca5e43 100644
--- a/src/models/events/payload/pull_request_review.rs
+++ b/src/models/events/payload/pull_request_review.rs
@@ -1,7 +1,4 @@
-use crate::models::{
-    pulls::{PullRequest, Review},
-    Repository, User,
-};
+use crate::models::pulls::{PullRequest, Review};
 use serde::{Deserialize, Serialize};
 
 /// The payload in a [`super::EventPayload::PullRequestReviewEvent`] type.
diff --git a/src/models/repos.rs b/src/models/repos.rs
index 2183590a..e4ddbe34 100644
--- a/src/models/repos.rs
+++ b/src/models/repos.rs
@@ -207,10 +207,11 @@ impl Content {
     /// # }
     /// ```
     pub fn decoded_content(&self) -> Option<String> {
+        use base64::Engine;
         self.content.as_ref().and_then(|c| {
             let mut content = c.as_bytes().to_owned();
             content.retain(|b| !b" \n\t\r\x0b\x0c".contains(b));
-            let c = base64::decode(&content).unwrap();
+            let c = base64::prelude::BASE64_STANDARD.decode(content).unwrap();
             Some(String::from_utf8_lossy(&c).into_owned())
         })
     }