diff --git a/Cargo.toml b/Cargo.toml
index efb6f03..e7b445a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,9 +18,8 @@ name = "cfdp"
 [dependencies]
 crc = "3"
 smallvec = "1"
-derive-new = ">=0.6, <=0.7"
-hashbrown = { version = ">=0.14, <=0.15", optional = true }
-spacepackets = { version = "0.17", default-features = false }
+hashbrown = { version = "0.17", optional = true }
+spacepackets = { version = "0.18", default-features = false }
 thiserror = { version = "2", default-features = false }
 heapless = "0.9"
 serde = { version = "1", optional = true }
@@ -54,7 +53,7 @@ packet-buf-4k = []
 
 [dev-dependencies]
 tempfile = "3"
-rand = "0.9"
+rand = "0.10"
 log = "0.4"
 fern = "0.7"
 chrono = "0.4"
diff --git a/src/dest.rs b/src/dest.rs
index ba7d87d..6f85090 100644
--- a/src/dest.rs
+++ b/src/dest.rs
@@ -876,9 +876,9 @@ impl<
         );
         if let Err(e) = self.vfs.write_data(
             // Safety: It was already verified that the path is valid during the transaction start.
+            #[allow(unsafe_code)]
             unsafe {
                 from_utf8_unchecked(
-                    //from_utf8(
                     &self.transaction_params.file_names.dest_path_buf
                         [0..self.transaction_params.file_names.dest_file_path_len],
                 )
@@ -1469,6 +1469,7 @@ impl<
         match self.vfs.checksum_verify(
             checksum,
             // Safety: It was already verified that the path is valid during the transaction start.
+            #[allow(unsafe_code)]
             unsafe {
                 from_utf8_unchecked(
                     &self.transaction_params.file_names.dest_path_buf
@@ -1788,6 +1789,7 @@ impl<
                 == DeliveryCode::Incomplete
         {
             // Safety: We already verified that the path is valid during the transaction start.
+            #[allow(unsafe_code)]
             let dest_path = unsafe {
                 from_utf8_unchecked(
                     &self.transaction_params.file_names.dest_path_buf
@@ -1914,7 +1916,7 @@ mod tests {
     };
 
     use alloc::vec::Vec;
-    use rand::Rng;
+    use rand::RngExt as _;
     use spacepackets::{
         cfdp::{
             ChecksumType, TransmissionMode,
@@ -2305,7 +2307,7 @@ mod tests {
 
     fn init_full_filepaths_textfile() -> (PathBuf, PathBuf) {
         (
-            tempfile::TempPath::from_path("/tmp/test.txt").to_path_buf(),
+            PathBuf::from("/tmp/test.txt"),
             tempfile::NamedTempFile::new()
                 .unwrap()
                 .into_temp_path()
@@ -2976,7 +2978,7 @@ mod tests {
     #[test]
     fn test_file_copy_to_directory() {
         let fault_handler = TestFaultHandler::default();
-        let src_path = tempfile::TempPath::from_path("/tmp/test.txt").to_path_buf();
+        let src_path = PathBuf::from("/tmp/test.txt");
         let dest_path = tempfile::TempDir::new().unwrap();
         let mut dest_path_buf = dest_path.keep();
         let mut tb = DestHandlerTestbench::new(
diff --git a/src/lib.rs b/src/lib.rs
index fc7cc1e..4ee8241 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -108,6 +108,7 @@
 //! you could schedule a fixed amount of handlers inside a
 //! [threadpool](https://docs.rs/threadpool/latest/threadpool/).
 #![no_std]
+#![warn(unsafe_code)]
 // Show which crate feature enables conditionally compiled APIs in documentation.
 #![cfg_attr(docsrs, feature(doc_cfg))]
 #[cfg(feature = "alloc")]
diff --git a/src/source.rs b/src/source.rs
index 47bbc33..b050232 100644
--- a/src/source.rs
+++ b/src/source.rs
@@ -502,24 +502,16 @@ impl<
         }
         let remote_cfg = remote_cfg.unwrap();
         self.state_helper.num_packets_ready.set(0);
-        let transmission_mode = if self.put_request_cacher.static_fields.trans_mode.is_some() {
-            self.put_request_cacher.static_fields.trans_mode.unwrap()
-        } else {
-            remote_cfg.default_transmission_mode
-        };
-        let closure_requested = if self
+        let transmission_mode = self
+            .put_request_cacher
+            .static_fields
+            .trans_mode
+            .unwrap_or(remote_cfg.default_transmission_mode);
+        let closure_requested = self
             .put_request_cacher
             .static_fields
             .closure_requested
-            .is_some()
-        {
-            self.put_request_cacher
-                .static_fields
-                .closure_requested
-                .unwrap()
-        } else {
-            remote_cfg.closure_requested_by_default
-        };
+            .unwrap_or(remote_cfg.closure_requested_by_default);
         if self.put_request_cacher.has_source_file()
             && !self.vfs.exists(self.put_request_cacher.source_file()?)?
         {
@@ -529,7 +521,7 @@ impl<
         let transaction_id = TransactionId::new(
             self.local_cfg().id,
             UnsignedByteField::new(
-                SequenceCounterInstance::MAX_BIT_WIDTH / 8,
+                self.seq_count_provider.max_bit_width() / 8,
                 self.seq_count_provider.get_and_increment().into(),
             ),
         );
@@ -1037,11 +1029,8 @@ impl<
             remote_cfg.max_packet_len,
             None,
         );
-        if remote_cfg.max_file_segment_len.is_some() {
-            derived_max_seg_len = core::cmp::min(
-                remote_cfg.max_file_segment_len.unwrap(),
-                derived_max_seg_len,
-            );
+        if let Some(max_file_segment_len) = remote_cfg.max_file_segment_len {
+            derived_max_seg_len = core::cmp::min(max_file_segment_len, derived_max_seg_len);
         }
         derived_max_seg_len as u64
     }
@@ -1292,7 +1281,7 @@ mod tests {
     use std::{fs::OpenOptions, io::Write, path::PathBuf, vec::Vec};
 
     use alloc::string::String;
-    use rand::Rng;
+    use rand::RngExt as _;
     use spacepackets::{
         cfdp::{
             ChecksumType, CrcFlag,
@@ -1325,7 +1314,7 @@ mod tests {
     fn init_full_filepaths_textfile() -> (TempPath, PathBuf) {
         (
             tempfile::NamedTempFile::new().unwrap().into_temp_path(),
-            tempfile::TempPath::from_path("/tmp/test.txt").to_path_buf(),
+            PathBuf::from("/tmp/test.txt"),
         )
     }