diff --git a/Cargo.toml b/Cargo.toml
index 08d35a7a..a6282e58 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -527,6 +527,8 @@ explicit_deref_methods = "warn"
 explicit_iter_loop = "warn"
 manual_let_else = "warn"
 trivially_copy_pass_by_ref = "warn"
+wildcard_imports = "warn"
+checked_conversions = "warn"
 
 # some sadness
 missing_errors_doc = "allow"
diff --git a/src/routes.rs b/src/routes.rs
index 7f325c85..cb43322f 100644
--- a/src/routes.rs
+++ b/src/routes.rs
@@ -8,7 +8,7 @@ use axum::{
 };
 use conduit::{
 	api::{client_server, server_server},
-	*,
+	Error, Result, Ruma, RumaResponse,
 };
 use http::{Method, Uri};
 use ruma::api::{client::error::ErrorKind, IncomingRequest};
diff --git a/src/service/media/mod.rs b/src/service/media/mod.rs
index 6d728a13..6d3ef196 100644
--- a/src/service/media/mod.rs
+++ b/src/service/media/mod.rs
@@ -394,12 +394,12 @@ impl Service {
 							u64::from(original_width) * u64::from(height) / u64::from(original_height)
 						};
 						if use_width {
-							if intermediate <= u64::from(u32::MAX) {
+							if u32::try_from(intermediate).is_ok() {
 								(width, intermediate as u32)
 							} else {
 								((u64::from(width) * u64::from(u32::MAX) / intermediate) as u32, u32::MAX)
 							}
-						} else if intermediate <= u64::from(u32::MAX) {
+						} else if u32::try_from(intermediate).is_ok() {
 							(intermediate as u32, height)
 						} else {
 							(u32::MAX, (u64::from(height) * u64::from(u32::MAX) / intermediate) as u32)
diff --git a/src/service/presence/mod.rs b/src/service/presence/mod.rs
index 534894cc..1b8672f7 100644
--- a/src/service/presence/mod.rs
+++ b/src/service/presence/mod.rs
@@ -110,6 +110,8 @@ impl Service {
 	/// Pings the presence of the given user in the given room, setting the
 	/// specified state.
 	pub fn ping_presence(&self, user_id: &UserId, new_state: &PresenceState) -> Result<()> {
+		const REFRESH_TIMEOUT: u64 = 60 * 25 * 1000;
+
 		let last_presence = self.db.get_presence(user_id)?;
 		let state_changed = match last_presence {
 			None => true,
@@ -121,7 +123,6 @@ impl Service {
 			Some((_, ref presence)) => presence.content.last_active_ago.unwrap_or_default().into(),
 		};
 
-		const REFRESH_TIMEOUT: u64 = 60 * 25 * 1000;
 		if !state_changed && last_last_active_ago < REFRESH_TIMEOUT {
 			return Ok(());
 		}