diff --git a/1/1.py b/1/1.py
index e6a4807..25b83e0 100755
--- a/1/1.py
+++ b/1/1.py
@@ -4,7 +4,7 @@
 
 count = 0
 
-with open('input.txt') as f:
+with open('input.txt', encoding="utf-8") as f:
     previous_value = int(f.readline())
 
     for line in f:
diff --git a/1/1_2.py b/1/1_2.py
index ba663ba..0407f03 100755
--- a/1/1_2.py
+++ b/1/1_2.py
@@ -4,7 +4,7 @@
 
 count = 0
 
-with open('input.txt') as f:
+with open('input.txt', encoding="utf-8") as f:
     n2_value = int(f.readline())
     n1_value = int(f.readline())
     n_value = int(f.readline())
diff --git a/10/10.py b/10/10.py
index f948f45..bb471c7 100755
--- a/10/10.py
+++ b/10/10.py
@@ -2,7 +2,7 @@
 # 2021 - Advent Of Code - 10
 
 def parse_file(file):
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         i = 0
         for line in f.readlines():
             chunks = []
diff --git a/10/10_2.py b/10/10_2.py
index d29d1fa..4ade614 100755
--- a/10/10_2.py
+++ b/10/10_2.py
@@ -3,7 +3,7 @@
 
 def parse_file(file):
     non_corrupted = []
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         i = 0
         for line in f.readlines():
             chunks = []
diff --git a/11/11.py b/11/11.py
index ec06d9f..e7b9b8e 100755
--- a/11/11.py
+++ b/11/11.py
@@ -5,7 +5,7 @@ GRID_SIZE = 10
 
 
 def parse_file(file):
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         columns = []
         for line in f.readlines():
             columns.append([int(c) for c in line.strip()])
diff --git a/11/11_2.py b/11/11_2.py
index 1549523..10606fb 100755
--- a/11/11_2.py
+++ b/11/11_2.py
@@ -5,7 +5,7 @@ GRID_SIZE = 10
 
 
 def parse_file(file):
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         columns = []
         for line in f.readlines():
             columns.append([int(c) for c in line.strip()])
diff --git a/12/12.py b/12/12.py
index 782ce96..e6250f1 100755
--- a/12/12.py
+++ b/12/12.py
@@ -3,7 +3,7 @@
 
 
 def parse_file(file):
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         return [x.strip() for x in f.readlines()]
 
 
diff --git a/12/12_2.py b/12/12_2.py
index bab9e92..2ee4eea 100755
--- a/12/12_2.py
+++ b/12/12_2.py
@@ -3,7 +3,7 @@
 
 
 def parse_file(file):
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         return [x.strip() for x in f.readlines()]
 
 
diff --git a/13/13.py b/13/13.py
index 07a35ef..3e67374 100755
--- a/13/13.py
+++ b/13/13.py
@@ -5,7 +5,7 @@
 def parse_file(file):
     parsed_dots = []
     parsed_folds = []
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         for line in f.readlines():
             if line.startswith('fold along '):
                 _, f = line.strip().split('fold along ')
diff --git a/13/13_2.py b/13/13_2.py
index 7a9bc9b..5e521fa 100755
--- a/13/13_2.py
+++ b/13/13_2.py
@@ -5,7 +5,7 @@
 def parse_file(file):
     parsed_dots = []
     parsed_folds = []
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         for line in f.readlines():
             if line.startswith('fold along '):
                 _, f = line.strip().split('fold along ')
diff --git a/14/14.py b/14/14.py
index 9f03472..3a29e82 100755
--- a/14/14.py
+++ b/14/14.py
@@ -5,7 +5,7 @@ from collections import Counter
 
 
 def parse_file(file):
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         poly_string = list(f.readline().strip())
         f.readline()
         insertion_rules = dict([line.strip().split(' -> ') for line in f.readlines()])
@@ -38,7 +38,7 @@ print(f'rules: {rules}')
 for s in range(13):
     print(f'step: {s}')
     poly = step_poly(poly, rules)
-    #print(poly)
+    # print(poly)
 
 print(Counter(poly))
 c = Counter(poly).most_common()[0][1] - Counter(poly).most_common()[-1][1]
diff --git a/14/14_2.py b/14/14_2.py
index 9eb17ca..2a5eb1f 100755
--- a/14/14_2.py
+++ b/14/14_2.py
@@ -7,7 +7,7 @@ from collections import Counter
 def parse_file(file):
     poly_list = []
     insertion_rules = {}
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         poly_str = list(f.readline().strip())
 
         for i, p in enumerate(poly_str):
diff --git a/14/14_2_bad.py b/14/14_2_bad.py
index 1273dc7..e5e12b8 100755
--- a/14/14_2_bad.py
+++ b/14/14_2_bad.py
@@ -5,7 +5,7 @@ from collections import Counter
 
 
 def parse_file(file):
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         poly_string = list(f.readline().strip())
         f.readline()
         insertion_rules = dict([line.strip().split(' -> ') for line in f.readlines()])
diff --git a/2/2.py b/2/2.py
index 0f655cd..e4ab5bd 100755
--- a/2/2.py
+++ b/2/2.py
@@ -8,7 +8,7 @@ y = 0
 
 re_parse = re.compile(r'(forward|up|down) (\d+)')
 
-with open('input.txt') as f:
+with open('input.txt', encoding="utf-8") as f:
     for line in f:
         m = re_parse.match(line)
         direction, unit = m.group(1), int(m.group(2))
diff --git a/2/2_2.py b/2/2_2.py
index d39ed4d..ea4db76 100755
--- a/2/2_2.py
+++ b/2/2_2.py
@@ -9,7 +9,7 @@ aim = 0
 
 re_parse = re.compile(r'(forward|up|down) (\d+)')
 
-with open('input.txt') as f:
+with open('input.txt', encoding="utf-8") as f:
     for line in f:
         m = re_parse.match(line)
         direction, unit = m.group(1), int(m.group(2))
diff --git a/3/3.py b/3/3.py
index 2e0d232..ab59341 100755
--- a/3/3.py
+++ b/3/3.py
@@ -9,7 +9,7 @@ result = [0] * 12
 
 re_parse = re.compile(r'(\d)'*12)
 
-with open('input.txt') as f:
+with open('input.txt', encoding="utf-8") as f:
     for line in f:
         m = re_parse.match(line)
         line_count += 1
diff --git a/3/3_2.py b/3/3_2.py
index 7a44adb..3dabad3 100755
--- a/3/3_2.py
+++ b/3/3_2.py
@@ -58,7 +58,7 @@ def filter_freq(buffer, freq_buf, mode):
 
 
 line_buf = []
-with open('input.txt') as f:
+with open('input.txt', encoding="utf-8") as f:
     for input_line in f:
         line_buf.append(input_line)
 
diff --git a/4/4.py b/4/4.py
index 3f3b21f..699a3aa 100755
--- a/4/4.py
+++ b/4/4.py
@@ -57,7 +57,7 @@ class Board:
 
 def parse_file(file):
     boards_list = []
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         numbers = f.readline().split(',')
 
         line = f.readline()
diff --git a/4/4_2.py b/4/4_2.py
index b15c705..2a6b59e 100755
--- a/4/4_2.py
+++ b/4/4_2.py
@@ -57,7 +57,7 @@ class Board:
 
 def parse_file(file):
     boards_list = []
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         numbers = f.readline().split(',')
 
         line = f.readline()
diff --git a/5/5.py b/5/5.py
index f676b47..88fcc96 100755
--- a/5/5.py
+++ b/5/5.py
@@ -4,7 +4,7 @@
 def parse_file(file):
     horizontal_lines = []
     vertical_lines = []
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         for l in f.readlines():
             p1, p2 = l.strip().split(' -> ')
             strx1, stry1 = p1.split(',')
diff --git a/5/5_2.py b/5/5_2.py
index 8360a15..99ce445 100755
--- a/5/5_2.py
+++ b/5/5_2.py
@@ -5,7 +5,7 @@ def parse_file(file):
     horizontal_lines = []
     vertical_lines = []
     diagonal_lines = []
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         for l in f.readlines():
             p1, p2 = l.strip().split(' -> ')
             strx1, stry1 = p1.split(',')
diff --git a/6/6.py b/6/6.py
index ba3e31e..2104628 100755
--- a/6/6.py
+++ b/6/6.py
@@ -2,7 +2,7 @@
 # 2021 - Advent Of Code - 6
 
 def parse_file(file):
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         line = f.readline()
     return [int(x) for x in line.split(',')]
 
diff --git a/6/6_2.py b/6/6_2.py
index 378ea69..cf4d138 100755
--- a/6/6_2.py
+++ b/6/6_2.py
@@ -2,7 +2,7 @@
 # 2021 - Advent Of Code - 6 part 2
 
 def parse_file(file):
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         line = f.readline()
 
     list_state = [int(x) for x in line.split(',')]
diff --git a/7/7.py b/7/7.py
index 0ac4844..6210d6a 100755
--- a/7/7.py
+++ b/7/7.py
@@ -2,7 +2,7 @@
 # 2021 - Advent Of Code - 7
 
 def parse_file(file):
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         line = f.readline()
 
     list_state = [int(x) for x in line.split(',')]
diff --git a/7/7_2.py b/7/7_2.py
index 4852ebb..a4090b0 100755
--- a/7/7_2.py
+++ b/7/7_2.py
@@ -2,7 +2,7 @@
 # 2021 - Advent Of Code - 7 part 2
 
 def parse_file(file):
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         line = f.readline()
 
     list_state = [int(x) for x in line.split(',')]
diff --git a/8/8.py b/8/8.py
index ea341bc..bd90146 100755
--- a/8/8.py
+++ b/8/8.py
@@ -3,7 +3,7 @@
 
 def parse_file(file):
     outs = []
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         for line in f.readlines():
             _, out = line.strip().split('| ')
             outs.append(out)
diff --git a/8/8_2.py b/8/8_2.py
index 8563a69..194af08 100755
--- a/8/8_2.py
+++ b/8/8_2.py
@@ -6,7 +6,7 @@
 def parse_file(file):
     numbers_list = []
     outputs = []
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         for line in f.readlines():
             numbers, output = line.strip().split(' | ')
             numbers_list.append(numbers)
diff --git a/9/9.py b/9/9.py
index 05a228e..eac8960 100755
--- a/9/9.py
+++ b/9/9.py
@@ -3,7 +3,7 @@
 
 def parse_file(file):
     hmap = []
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         for line in f.readlines():
             linemap = []
             for n in line.strip():
diff --git a/9/9_2.py b/9/9_2.py
index 23e6276..782cb27 100755
--- a/9/9_2.py
+++ b/9/9_2.py
@@ -3,7 +3,7 @@
 
 def parse_file(file):
     hmap = []
-    with open(file) as f:
+    with open(file, encoding="utf-8") as f:
         for line in f.readlines():
             linemap = []
             for n in line.strip():