diff --git a/matrix_sdk_base/src/client.rs b/matrix_sdk_base/src/client.rs
index 46c28d5d..5cbc2b04 100644
--- a/matrix_sdk_base/src/client.rs
+++ b/matrix_sdk_base/src/client.rs
@@ -61,6 +61,7 @@ use matrix_sdk_crypto::{OlmMachine, OneTimeKeys};
 pub type Token = String;
 
 /// Signals to the `BaseClient` which `RoomState` to send to `EventEmitter`.
+#[derive(Debug)]
 pub enum RoomStateType {
     /// Represents a joined room, the `joined_rooms` HashMap will be used.
     Joined,
@@ -75,6 +76,7 @@ pub enum RoomStateType {
 /// If the event came from the `join`, `invite` or `leave` rooms map from the server
 /// the variant that holds the corresponding room is used. `RoomState` is generic
 /// so it can be used to represent a `Room` or an `Arc<RwLock<Room>>`
+#[derive(Debug)]
 pub enum RoomState<R> {
     /// A room from the `join` section of a sync response.
     Joined(R),
diff --git a/matrix_sdk_base/src/lib.rs b/matrix_sdk_base/src/lib.rs
index 9c61b2c1..da31f38a 100644
--- a/matrix_sdk_base/src/lib.rs
+++ b/matrix_sdk_base/src/lib.rs
@@ -24,7 +24,16 @@
 //! keys. If this is disabled and `encryption` support is enabled the keys will
 //! by default be stored only in memory and thus lost after the client is
 //! destroyed.
-#![deny(missing_docs)]
+#![deny(
+    missing_debug_implementations,
+    dead_code,
+    missing_docs,
+    trivial_casts,
+    trivial_numeric_casts,
+    unused_extern_crates,
+    unused_import_braces,
+    unused_qualifications
+)]
 
 pub use crate::{error::Error, error::Result, session::Session};
 pub use matrix_sdk_common::*;
diff --git a/matrix_sdk_base/src/state/json_store.rs b/matrix_sdk_base/src/state/json_store.rs
index 4d519617..8c74532b 100644
--- a/matrix_sdk_base/src/state/json_store.rs
+++ b/matrix_sdk_base/src/state/json_store.rs
@@ -1,4 +1,5 @@
 use std::collections::HashMap;
+use std::fmt;
 use std::fs;
 use std::path::{Path, PathBuf};
 use std::sync::{
@@ -39,6 +40,14 @@ impl JsonStore {
     }
 }
 
+impl fmt::Debug for JsonStore {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("JsonStore")
+            .field("path", &self.path)
+            .finish()
+    }
+}
+
 #[async_trait::async_trait]
 impl StateStore for JsonStore {
     async fn load_client_state(&self, sess: &Session) -> Result<Option<ClientState>> {
diff --git a/matrix_sdk_base/src/state/mod.rs b/matrix_sdk_base/src/state/mod.rs
index cc785de4..6d628e2d 100644
--- a/matrix_sdk_base/src/state/mod.rs
+++ b/matrix_sdk_base/src/state/mod.rs
@@ -68,6 +68,7 @@ impl ClientState {
 /// `JsonStore::load_all_rooms` returns `AllRooms`.
 ///
 /// `AllRooms` is made of the `joined`, `invited` and `left` room maps.
+#[derive(Debug)]
 pub struct AllRooms {
     /// The joined room mapping of `RoomId` to `Room`.
     pub joined: HashMap<RoomId, Room>,