diff --git a/librocksdb-sys/rocksdb b/librocksdb-sys/rocksdb
index 50f206ad8..48bfca38f 160000
--- a/librocksdb-sys/rocksdb
+++ b/librocksdb-sys/rocksdb
@@ -1 +1 @@
-Subproject commit 50f206ad84fa6cd516bad1bea93c03ae0655b314
+Subproject commit 48bfca38f6f175435052a59791922a1a453d9609
diff --git a/librocksdb-sys/rocksdb_lib_sources.txt b/librocksdb-sys/rocksdb_lib_sources.txt
index 716b03d17..bf06ae24d 100644
--- a/librocksdb-sys/rocksdb_lib_sources.txt
+++ b/librocksdb-sys/rocksdb_lib_sources.txt
@@ -20,7 +20,6 @@ db/compaction/compaction_picker.cc
 db/compaction/compaction_picker_fifo.cc
 db/compaction/compaction_picker_level.cc
 db/compaction/compaction_picker_universal.cc
-db/compaction/sst_partitioner.cc
 db/convenience.cc
 db/db_filesnapshot.cc
 db/db_impl/db_impl.cc
@@ -77,7 +76,6 @@ env/env_hdfs.cc
 env/env_posix.cc
 env/file_system.cc
 env/fs_posix.cc
-env/file_system_tracer.cc
 env/io_posix.cc
 env/mock_env.cc
 file/delete_scheduler.cc
@@ -166,7 +164,6 @@ table/plain/plain_table_factory.cc
 table/plain/plain_table_index.cc
 table/plain/plain_table_key_coding.cc
 table/plain/plain_table_reader.cc
-table/sst_file_dumper.cc
 table/sst_file_reader.cc
 table/sst_file_writer.cc
 table/table_properties.cc
@@ -177,7 +174,6 @@ test_util/transaction_test_util.cc
 tools/dump/db_dump_tool.cc
 trace_replay/trace_replay.cc
 trace_replay/block_cache_tracer.cc
-trace_replay/io_tracer.cc
 util/build_version.cc
 util/coding.cc
 util/compaction_job_stats_impl.cc
@@ -212,8 +208,6 @@ utilities/convenience/info_log_finder.cc
 utilities/debug.cc
 utilities/env_mirror.cc
 utilities/env_timed.cc
-utilities/fault_injection_env.cc
-utilities/fault_injection_fs.cc
 utilities/leveldb_options/leveldb_options.cc
 utilities/memory/memory_util.cc
 utilities/merge_operators/max.cc
@@ -250,4 +244,4 @@ utilities/transactions/write_unprepared_txn.cc
 utilities/transactions/write_unprepared_txn_db.cc
 utilities/ttl/db_ttl_impl.cc
 utilities/write_batch_with_index/write_batch_with_index.cc
-utilities/write_batch_with_index/write_batch_with_index_internal.cc
+utilities/write_batch_with_index/write_batch_with_index_internal.cc
\ No newline at end of file
diff --git a/src/compaction_filter.rs b/src/compaction_filter.rs
index 3e82730c7..65d72e7d9 100644
--- a/src/compaction_filter.rs
+++ b/src/compaction_filter.rs
@@ -137,7 +137,7 @@ where
         Change(newval) => {
             *new_value = newval.as_ptr() as *mut c_char;
             *new_value_length = newval.len() as size_t;
-            *value_changed = 1_u8;
+            *value_changed = 1 as c_uchar;
             0
         }
     }
diff --git a/src/db_options.rs b/src/db_options.rs
index 40d177158..b4545ee95 100644
--- a/src/db_options.rs
+++ b/src/db_options.rs
@@ -137,22 +137,6 @@ impl Env {
         }
     }
 
-    /// Sets the size of the low priority thread pool that can be used to
-    /// prevent compactions from stalling memtable flushes.
-    pub fn set_low_priority_background_threads(&mut self, n: c_int) {
-        unsafe {
-            ffi::rocksdb_env_set_low_priority_background_threads(self.inner, n);
-        }
-    }
-
-    /// Sets the size of the bottom priority thread pool that can be used to
-    /// prevent compactions from stalling memtable flushes.
-    pub fn set_bottom_priority_background_threads(&mut self, n: c_int) {
-        unsafe {
-            ffi::rocksdb_env_set_bottom_priority_background_threads(self.inner, n);
-        }
-    }
-
     /// Wait for all threads started by StartThread to terminate.
     pub fn join_all_threads(&mut self) {
         unsafe {
@@ -2239,24 +2223,6 @@ impl Options {
         }
     }
 
-    /// If not zero, dump rocksdb.stats to RocksDB to LOG every `stats_persist_period_sec`.
-    ///
-    /// Default: `600` (10 mins)
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use rocksdb::Options;
-    ///
-    /// let mut opts = Options::default();
-    /// opts.set_stats_persist_period_sec(5);
-    /// ```
-    pub fn set_stats_persist_period_sec(&mut self, period: c_uint) {
-        unsafe {
-            ffi::rocksdb_options_set_stats_persist_period_sec(self.inner, period);
-        }
-    }
-
     /// When set to true, reading SST files will opt out of the filesystem's
     /// readahead. Setting this to false may improve sequential iteration
     /// performance.
@@ -3454,15 +3420,4 @@ mod tests {
             branching_factor: 4,
         });
     }
-
-    #[test]
-    fn test_set_stats_persist_period_sec() {
-        let mut opts = Options::default();
-        opts.enable_statistics();
-        opts.set_stats_persist_period_sec(5);
-        assert!(opts.get_statistics().is_some());
-
-        let opts = Options::default();
-        assert!(opts.get_statistics().is_none());
-    }
 }
diff --git a/tests/test_db.rs b/tests/test_db.rs
index d9ec85b24..eed57dc87 100644
--- a/tests/test_db.rs
+++ b/tests/test_db.rs
@@ -779,29 +779,6 @@ fn get_with_cache_and_bulkload_test() {
         opts.set_error_if_exists(true);
         assert!(DB::open(&opts, &path).is_err());
     }
-
-    // disable all threads
-    {
-        // create new options
-        let mut opts = Options::default();
-        opts.set_max_background_jobs(0);
-        opts.set_stats_dump_period_sec(0);
-        opts.set_stats_persist_period_sec(0);
-
-        // test Env::Default()->SetBackgroundThreads(0, Env::Priority::BOTTOM);
-        let mut env = Env::default().unwrap();
-        env.set_bottom_priority_background_threads(0);
-        opts.set_env(&env);
-
-        // open db
-        let db = DB::open(&opts, &path).unwrap();
-
-        // try to get key
-        let iter = db.iterator(IteratorMode::Start);
-        for (expected, (k, _)) in iter.enumerate() {
-            assert_eq!(k.as_ref(), format!("{:0>4}", expected).as_bytes());
-        }
-    }
 }
 
 #[test]