diff --git a/CHANGELOG.md b/CHANGELOG.md
index 83b120c..d14c28f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [v0.0.10](https://github.com/bigbio/py-pgatk/tree/v0.0.10) (2021-02-05)
+
+**Implemented enhancements:**
+
+- Ensembl release [\#23](https://github.com/bigbio/py-pgatk/issues/23)
+- Add a changelog.md to the project  [\#22](https://github.com/bigbio/py-pgatk/issues/22)
+
 ## [v0.0.9](https://github.com/bigbio/py-pgatk/tree/v0.0.9) (2021-02-03)
 
 **Implemented enhancements:**
diff --git a/pypgatk/proteomics/db/decoy_pyrat.py b/pypgatk/proteomics/db/decoy_pyrat.py
index 2a975bc..89bf014 100644
--- a/pypgatk/proteomics/db/decoy_pyrat.py
+++ b/pypgatk/proteomics/db/decoy_pyrat.py
@@ -199,39 +199,37 @@ def decoy_database(self):
         # empty protein sequence
         seq = ''
 
-        # open temporary decoy FASTA file
-        outfa = open(self._temp_file, 'w')
-
         # Open FASTA file using first cmd line argument
         fasta = SeqIO.parse(self._input_fasta, 'fasta')
-        # loop each seq in the file
-        for record in fasta:
-                seq = str(record.seq)
-                dcount+=1
-                #make sequence isobaric (check args for switch off)
-                if not self._isobaric:
-                        seq = seq.replace('I', 'L')
-
-                #digest sequence add peptides to set
-                upeps.update(ProteinDBService.digest(seq, self._cleavage_sites, self._cleavage_position,
-                                                         self._anti_cleavage_sites, self._peptide_length))
-
-                #reverse and switch protein sequence
-                decoyseq = ProteinDBService.revswitch(seq, self._no_switch, self._cleavage_sites)
-
-                #do not store decoy peptide set in reduced memory mode
-                if not self._memory_save:
-                        #update decoy peptide set
-                        dpeps.update( ProteinDBService.digest(decoyseq, self._cleavage_sites, self._cleavage_position,
-                                                             self._anti_cleavage_sites, self._peptide_length))
 
-                #write decoy protein accession and sequence to file
-                outfa.write('>' + self._decoy_prefix + record.id + '\n')
-                outfa.write(decoyseq + '\n')
+        # open temporary decoy FASTA file
+        with open(self._temp_file, 'w') as outfa:
+
+            # loop each seq in the file
+            for record in fasta:
+                    seq = str(record.seq)
+                    dcount+=1
+                    #make sequence isobaric (check args for switch off)
+                    if not self._isobaric:
+                            seq = seq.replace('I', 'L')
+    
+                    #digest sequence add peptides to set
+                    upeps.update(ProteinDBService.digest(seq, self._cleavage_sites, self._cleavage_position,
+                                                             self._anti_cleavage_sites, self._peptide_length))
+    
+                    #reverse and switch protein sequence
+                    decoyseq = ProteinDBService.revswitch(seq, self._no_switch, self._cleavage_sites)
+    
+                    #do not store decoy peptide set in reduced memory mode
+                    if not self._memory_save:
+                            #update decoy peptide set
+                            dpeps.update( ProteinDBService.digest(decoyseq, self._cleavage_sites, self._cleavage_position,
+                                                                 self._anti_cleavage_sites, self._peptide_length))
+    
+                    #write decoy protein accession and sequence to file
+                    outfa.write('>' + self._decoy_prefix + record.id + '\n')
+                    outfa.write(decoyseq + '\n')
 
-        # Close files
-        fasta.close()
-        outfa.close()
 
         # Summarise the numbers of target and decoy peptides and their intersection
         nonDecoys = set()
diff --git a/setup.py b/setup.py
index 1d74054..e2b80f1 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@ def readme():
         return f.read()
 
 setup(name='pypgatk',
-      version='0.0.10',
+      version='0.0.11',
       description='Python tools for proteogenomics',
       url='http://github.com/bigbio/py-pgatk',
       long_description=readme(),