diff --git a/setup.cfg b/setup.cfg
index 86e9c08c185b6dd490131cb1c3eefcb2a7465580..6a7da98776da7ae092ff61398baa0bad7bab7f44 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,7 +1,7 @@
 # coding: utf-8
 [metadata]
 name = tempsdb
-version = 0.6a5
+version = 0.6
 long-description = file: README.md
 long-description-content-type = text/markdown; charset=UTF-8
 license_files = LICENSE
diff --git a/tempsdb/chunks/base.pyx b/tempsdb/chunks/base.pyx
index ff5eed7e17a466ac4c2782ea48542d3d03e35ba7..5c5aad8ed82be9f95e9cda8527dd06072b202233 100644
--- a/tempsdb/chunks/base.pyx
+++ b/tempsdb/chunks/base.pyx
@@ -7,7 +7,7 @@ import mmap
 import warnings
 
 from .gzip cimport ReadWriteGzipFile
-from ..exceptions import Corruption, InvalidState, AlreadyExists, StillOpen
+from ..exceptions import Corruption, StillOpen
 from ..series cimport TimeSeries
 
 
@@ -167,12 +167,6 @@ cdef class Chunk:
         self.pointer = self.entries*(self.block_size+TIMESTAMP_SIZE)+HEADER_SIZE
         self.max_ts = self.get_timestamp_at(self.entries-1)
 
-        print('Readed',self.path, 'entries=', self.entries, 'max ts=', self.max_ts,
-              'file size=', self.file_size, 'pointer=', self.pointer, 'page size=', self.page_size)
-
-        if self.entries == 3867:
-            print('last record of 3867: ', repr(self.mmap[69592:69610]))
-
         if self.pointer >= self.page_size:
             # Inform the OS that we don't need the header anymore
             self.mmap.madvise(mmap.MADV_DONTNEED, 0, HEADER_SIZE+TIMESTAMP_SIZE)
@@ -274,7 +268,6 @@ cdef class Chunk:
         cdef:
             unsigned long starting_index = HEADER_SIZE + index * (self.block_size + TIMESTAMP_SIZE)
             unsigned long stopping_index = starting_index + TIMESTAMP_SIZE
-        print('reading timestamp from', starting_index, 'to', stopping_index)
         return STRUCT_Q.unpack(self.mmap[starting_index:stopping_index])[0]
 
     cpdef unsigned int find_left(self, unsigned long long timestamp):
@@ -434,7 +427,6 @@ cdef class Chunk:
         self.sync()
         self.mmap.close()
         self.file.close()
-        print('closing', self.path)
         return 0
 
     def __del__(self) -> None:
diff --git a/tempsdb/chunks/normal.pyx b/tempsdb/chunks/normal.pyx
index 245b6f19b10de41c82839a57cf0bcc9130852644..fb20b11ab43c686d86948c1db9ff80c3ef8fd727 100644
--- a/tempsdb/chunks/normal.pyx
+++ b/tempsdb/chunks/normal.pyx
@@ -41,12 +41,12 @@ cdef class NormalChunk(Chunk):
         if self.file_lock_object:
             self.file_lock_object.acquire()
         try:
-            self.sync()
             self.file_size += self.page_size
             self.file.seek(0, io.SEEK_END)
             ba = bytearray(self.page_size)
             ba[-FOOTER_SIZE:] = STRUCT_L.pack(self.entries)
             self.file.write(ba)
+            self.file.flush()
             try:
                 self.mmap.resize(self.file_size)
             except OSError as e:
@@ -54,6 +54,7 @@ cdef class NormalChunk(Chunk):
                     self.switch_to_descriptor_based_access()
                 else:
                     raise
+            self.sync()
         finally:
             if self.file_lock_object:
                 self.file_lock_object.release()
@@ -78,12 +79,10 @@ cdef class NormalChunk(Chunk):
         if self.closed:
             raise InvalidState('chunk is closed')
 
-        if self.pointer >= self.file_size-FOOTER_SIZE-self.block_size-TIMESTAMP_SIZE:
+        if self.pointer > self.file_size-FOOTER_SIZE-self.block_size-TIMESTAMP_SIZE:
             self.extend()
         cdef unsigned long long ptr_end = self.pointer + TIMESTAMP_SIZE
         # Append entry
-        if self.entries > 4090:
-            print('writing %s to %s@%s ec=%s' % (repr(data), self.path, self.pointer, self.entries))
         self.mmap[self.pointer:ptr_end] = STRUCT_Q.pack(timestamp)
         self.mmap[ptr_end:ptr_end+self.block_size] = data
         self.entries += 1
diff --git a/tests/test_series.py b/tests/test_series.py
index 48c50720ce55f27d59004accbe4a34f40645dca0..740c1a0e8276d571a46d9c9bf66fd624fba05d4f 100644
--- a/tests/test_series.py
+++ b/tests/test_series.py
@@ -4,7 +4,6 @@ import unittest
 
 class TestSeries(unittest.TestCase):
 
-    @unittest.skip('bug')
     def test_write_series_append_after_close(self):
         from tempsdb.series import create_series, TimeSeries
         series = create_series('test6', 'test6', 10, 4096)
@@ -26,7 +25,6 @@ class TestSeries(unittest.TestCase):
 
         series.close()
 
-    @unittest.skip('because of reasons')
     def test_write_series_with_interim_close(self):
         from tempsdb.series import create_series, TimeSeries
         series = create_series('test4', 'test4', 10, 4096)