diff --git a/tests/golden_files/serialize.json b/tests/golden_files/serialize.json
index f084d18..a107497 100644
--- a/tests/golden_files/serialize.json
+++ b/tests/golden_files/serialize.json
@@ -1294,7 +1294,7 @@
                             "type": "line",
                             "is_current": false,
                             "lineno": 29,
-                            "text": "<span class=\"k\">def</span> <span class=\"nf\">bar</span><span class=\"p\">():</span>"
+                            "text": "<span class=\"k\">def</span><span class=\"w\"> </span><span class=\"nf\">bar</span><span class=\"p\">():</span>"
                         },
                         {
                             "type": "line",
@@ -1323,7 +1323,7 @@
                             "type": "line",
                             "is_current": false,
                             "lineno": 6,
-                            "text": "<span class=\"k\">def</span> <span class=\"nf\">foo</span><span class=\"p\">(</span><span class=\"n\">n</span><span class=\"o\">=</span><span class=\"mi\">5</span><span class=\"p\">):</span>"
+                            "text": "<span class=\"k\">def</span><span class=\"w\"> </span><span class=\"nf\">foo</span><span class=\"p\">(</span><span class=\"n\">n</span><span class=\"o\">=</span><span class=\"mi\">5</span><span class=\"p\">):</span>"
                         },
                         {
                             "type": "line",
@@ -1369,7 +1369,7 @@
                             "type": "line",
                             "is_current": false,
                             "lineno": 6,
-                            "text": "<span class=\"k\">def</span> <span class=\"nf\">foo</span><span class=\"p\">(</span><span class=\"n\">n</span><span class=\"o\">=</span><span class=\"mi\">5</span><span class=\"p\">):</span>"
+                            "text": "<span class=\"k\">def</span><span class=\"w\"> </span><span class=\"nf\">foo</span><span class=\"p\">(</span><span class=\"n\">n</span><span class=\"o\">=</span><span class=\"mi\">5</span><span class=\"p\">):</span>"
                         },
                         {
                             "type": "line",
@@ -1425,7 +1425,7 @@
                             "type": "line",
                             "is_current": false,
                             "lineno": 6,
-                            "text": "<span class=\"k\">def</span> <span class=\"nf\">foo</span><span class=\"p\">(</span><span class=\"n\">n</span><span class=\"o\">=</span><span class=\"mi\">5</span><span class=\"p\">):</span>"
+                            "text": "<span class=\"k\">def</span><span class=\"w\"> </span><span class=\"nf\">foo</span><span class=\"p\">(</span><span class=\"n\">n</span><span class=\"o\">=</span><span class=\"mi\">5</span><span class=\"p\">):</span>"
                         },
                         {
                             "type": "line",
@@ -1489,7 +1489,7 @@
                             "type": "line",
                             "is_current": true,
                             "lineno": 26,
-                            "text": "    <span class=\"k\">raise</span> <span class=\"ne\">TypeError</span> <span class=\"kn\">from</span> <span class=\"nn\">e</span>"
+                            "text": "    <span class=\"k\">raise</span> <span class=\"ne\">TypeError</span> <span class=\"kn\">from</span><span class=\"w\"> </span><span class=\"nn\">e</span>"
                         }
                     ],
                     "variables": [
diff --git a/tests/test_core.py b/tests/test_core.py
index b0ecdc2..5796530 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -573,8 +573,8 @@ def test_absolute_filename():
     [
         r".c { color: #(999999|ababab); font-style: italic }",
         r".err { color: #a61717; background-color: #e3d2d2 }",
-        r".c-ExecutingNode { color: #(999999|ababab); font-style: italic; background-color: #ffff00 }",
-        r".err-ExecutingNode { color: #a61717; background-color: #ffff00 }",
+        r".c-ExecutingNode { color: #(999999|ababab); font-style: italic; background-color: #(ffff00|FF0) }",
+        r".err-ExecutingNode { color: #A61717; background-color: #(ffff00|FF0) }",
     ]
 )
 def test_executing_style_defs(expected):
@@ -582,7 +582,7 @@ def test_executing_style_defs(expected):
     formatter = HtmlFormatter(style=style)
     style_defs = formatter.get_style_defs()
 
-    assert re.search(expected, style_defs)
+    assert re.search(expected, style_defs, re.IGNORECASE)
 
 
 def test_example():
@@ -630,7 +630,7 @@ def test_example():
 """
 
 
-@pytest.mark.skipif(pygments_version < (2, 14), reason="Different output in older Pygments")
+@pytest.mark.skipif(pygments_version < (2, 19), reason="Different output in older Pygments")
 def test_pygments_example():
     from .samples.pygments_example import bar
     result = bar()
@@ -638,14 +638,14 @@ def test_pygments_example():
     assert result == """\
 Terminal256Formatter native:
 
-  13 | \x1b[38;5;70;01mdef\x1b[39;00m\x1b[38;5;252m \x1b[39m\x1b[38;5;75mbar\x1b[39m\x1b[38;5;252m(\x1b[39m\x1b[38;5;252m)\x1b[39m\x1b[38;5;252m:\x1b[39m
+  13 | \x1b[38;5;70;01mdef\x1b[39;00m\x1b[38;5;241m \x1b[39m\x1b[38;5;75mbar\x1b[39m\x1b[38;5;252m(\x1b[39m\x1b[38;5;252m)\x1b[39m\x1b[38;5;252m:\x1b[39m
   14 | \x1b[38;5;252m    \x1b[39m\x1b[38;5;252mx\x1b[39m\x1b[38;5;252m \x1b[39m\x1b[38;5;252m=\x1b[39m\x1b[38;5;252m \x1b[39m\x1b[38;5;75m1\x1b[39m
   15 | \x1b[38;5;252m    \x1b[39m\x1b[38;5;38mstr\x1b[39m\x1b[38;5;252m(\x1b[39m\x1b[38;5;252mx\x1b[39m\x1b[38;5;252m)\x1b[39m
   17 | \x1b[38;5;252m    \x1b[39m\x1b[38;5;214m@deco\x1b[39m
-  18 | \x1b[38;5;252m    \x1b[39m\x1b[38;5;70;01mdef\x1b[39;00m\x1b[38;5;252m \x1b[39m\x1b[38;5;75mfoo\x1b[39m\x1b[38;5;252m(\x1b[39m\x1b[38;5;252m)\x1b[39m\x1b[38;5;252m:\x1b[39m
+  18 | \x1b[38;5;252m    \x1b[39m\x1b[38;5;70;01mdef\x1b[39;00m\x1b[38;5;241m \x1b[39m\x1b[38;5;75mfoo\x1b[39m\x1b[38;5;252m(\x1b[39m\x1b[38;5;252m)\x1b[39m\x1b[38;5;252m:\x1b[39m
   19 | \x1b[38;5;252m        \x1b[39m\x1b[38;5;70;01mpass\x1b[39;00m
 -----
-  25 | \x1b[38;5;70;01mdef\x1b[39;00m\x1b[38;5;252m \x1b[39m\x1b[38;5;75mdeco\x1b[39m\x1b[38;5;252m(\x1b[39m\x1b[38;5;252mf\x1b[39m\x1b[38;5;252m)\x1b[39m\x1b[38;5;252m:\x1b[39m
+  25 | \x1b[38;5;70;01mdef\x1b[39;00m\x1b[38;5;241m \x1b[39m\x1b[38;5;75mdeco\x1b[39m\x1b[38;5;252m(\x1b[39m\x1b[38;5;252mf\x1b[39m\x1b[38;5;252m)\x1b[39m\x1b[38;5;252m:\x1b[39m
   26 | \x1b[38;5;252m    \x1b[39m\x1b[38;5;252mf\x1b[39m\x1b[38;5;252m.\x1b[39m\x1b[38;5;252mresult\x1b[39m\x1b[38;5;252m \x1b[39m\x1b[38;5;252m=\x1b[39m\x1b[38;5;252m \x1b[39m\x1b[38;5;252mprint_stack\x1b[39m\x1b[38;5;252m(\x1b[39m\x1b[38;5;252m)\x1b[39m
   27 | \x1b[38;5;252m    \x1b[39m\x1b[38;5;70;01mreturn\x1b[39;00m\x1b[38;5;252m \x1b[39m\x1b[38;5;252mf\x1b[39m
 -----
@@ -654,14 +654,14 @@ def test_pygments_example():
 
 Terminal256Formatter <class \'stack_data.core.style_with_executing_node.<locals>.NewStyle\'>:
 
-  13 | \x1b[38;5;70;01mdef\x1b[39;00m\x1b[38;5;252m \x1b[39m\x1b[38;5;75mbar\x1b[39m\x1b[38;5;252m(\x1b[39m\x1b[38;5;252m)\x1b[39m\x1b[38;5;252m:\x1b[39m
+  13 | \x1b[38;5;70;01mdef\x1b[39;00m\x1b[38;5;241m \x1b[39m\x1b[38;5;75mbar\x1b[39m\x1b[38;5;252m(\x1b[39m\x1b[38;5;252m)\x1b[39m\x1b[38;5;252m:\x1b[39m
   14 | \x1b[38;5;252m    \x1b[39m\x1b[38;5;252mx\x1b[39m\x1b[38;5;252m \x1b[39m\x1b[38;5;252m=\x1b[39m\x1b[38;5;252m \x1b[39m\x1b[38;5;75m1\x1b[39m
   15 | \x1b[38;5;252m    \x1b[39m\x1b[38;5;38mstr\x1b[39m\x1b[38;5;252m(\x1b[39m\x1b[38;5;252mx\x1b[39m\x1b[38;5;252m)\x1b[39m
   17 | \x1b[38;5;252;48;5;58m    \x1b[39;49m\x1b[38;5;214;48;5;58m@deco\x1b[39;49m
-  18 | \x1b[38;5;252;48;5;58m    \x1b[39;49m\x1b[38;5;70;48;5;58;01mdef\x1b[39;49;00m\x1b[38;5;252;48;5;58m \x1b[39;49m\x1b[38;5;75;48;5;58mfoo\x1b[39;49m\x1b[38;5;252;48;5;58m(\x1b[39;49m\x1b[38;5;252;48;5;58m)\x1b[39;49m\x1b[38;5;252;48;5;58m:\x1b[39;49m
+  18 | \x1b[38;5;252;48;5;58m    \x1b[39;49m\x1b[38;5;70;48;5;58;01mdef\x1b[39;49;00m\x1b[38;5;241;48;5;58m \x1b[39;49m\x1b[38;5;75;48;5;58mfoo\x1b[39;49m\x1b[38;5;252;48;5;58m(\x1b[39;49m\x1b[38;5;252;48;5;58m)\x1b[39;49m\x1b[38;5;252;48;5;58m:\x1b[39;49m
   19 | \x1b[38;5;252;48;5;58m        \x1b[39;49m\x1b[38;5;70;48;5;58;01mpass\x1b[39;49;00m
 -----
-  25 | \x1b[38;5;70;01mdef\x1b[39;00m\x1b[38;5;252m \x1b[39m\x1b[38;5;75mdeco\x1b[39m\x1b[38;5;252m(\x1b[39m\x1b[38;5;252mf\x1b[39m\x1b[38;5;252m)\x1b[39m\x1b[38;5;252m:\x1b[39m
+  25 | \x1b[38;5;70;01mdef\x1b[39;00m\x1b[38;5;241m \x1b[39m\x1b[38;5;75mdeco\x1b[39m\x1b[38;5;252m(\x1b[39m\x1b[38;5;252mf\x1b[39m\x1b[38;5;252m)\x1b[39m\x1b[38;5;252m:\x1b[39m
   26 | \x1b[38;5;252m    \x1b[39m\x1b[38;5;252mf\x1b[39m\x1b[38;5;252m.\x1b[39m\x1b[38;5;252mresult\x1b[39m\x1b[38;5;252m \x1b[39m\x1b[38;5;252m=\x1b[39m\x1b[38;5;252m \x1b[39m\x1b[38;5;252;48;5;58mprint_stack\x1b[39;49m\x1b[38;5;252;48;5;58m(\x1b[39;49m\x1b[38;5;252;48;5;58m)\x1b[39;49m
   27 | \x1b[38;5;252m    \x1b[39m\x1b[38;5;70;01mreturn\x1b[39;00m\x1b[38;5;252m \x1b[39m\x1b[38;5;252mf\x1b[39m
 -----
@@ -670,14 +670,14 @@ def test_pygments_example():
 
 TerminalFormatter native:
 
-  13 | \x1b[34mdef\x1b[39;49;00m \x1b[32mbar\x1b[39;49;00m():\x1b[37m\x1b[39;49;00m
+  13 | \x1b[34mdef\x1b[39;49;00m\x1b[37m \x1b[39;49;00m\x1b[32mbar\x1b[39;49;00m():\x1b[37m\x1b[39;49;00m
   14 |     x = \x1b[34m1\x1b[39;49;00m\x1b[37m\x1b[39;49;00m
   15 |     \x1b[36mstr\x1b[39;49;00m(x)\x1b[37m\x1b[39;49;00m
   17 |     \x1b[90m@deco\x1b[39;49;00m\x1b[37m\x1b[39;49;00m
-  18 |     \x1b[34mdef\x1b[39;49;00m \x1b[32mfoo\x1b[39;49;00m():\x1b[37m\x1b[39;49;00m
+  18 |     \x1b[34mdef\x1b[39;49;00m\x1b[37m \x1b[39;49;00m\x1b[32mfoo\x1b[39;49;00m():\x1b[37m\x1b[39;49;00m
   19 |         \x1b[34mpass\x1b[39;49;00m\x1b[37m\x1b[39;49;00m
 -----
-  25 | \x1b[34mdef\x1b[39;49;00m \x1b[32mdeco\x1b[39;49;00m(f):\x1b[37m\x1b[39;49;00m
+  25 | \x1b[34mdef\x1b[39;49;00m\x1b[37m \x1b[39;49;00m\x1b[32mdeco\x1b[39;49;00m(f):\x1b[37m\x1b[39;49;00m
   26 |     f.result = print_stack()\x1b[37m\x1b[39;49;00m
   27 |     \x1b[34mreturn\x1b[39;49;00m f\x1b[37m\x1b[39;49;00m
 -----
@@ -686,14 +686,14 @@ def test_pygments_example():
 
 TerminalFormatter <class \'stack_data.core.style_with_executing_node.<locals>.NewStyle\'>:
 
-  13 | \x1b[34mdef\x1b[39;49;00m \x1b[32mbar\x1b[39;49;00m():\x1b[37m\x1b[39;49;00m
+  13 | \x1b[34mdef\x1b[39;49;00m\x1b[37m \x1b[39;49;00m\x1b[32mbar\x1b[39;49;00m():\x1b[37m\x1b[39;49;00m
   14 |     x = \x1b[34m1\x1b[39;49;00m\x1b[37m\x1b[39;49;00m
   15 |     \x1b[36mstr\x1b[39;49;00m(x)\x1b[37m\x1b[39;49;00m
   17 |     \x1b[90m@deco\x1b[39;49;00m\x1b[37m\x1b[39;49;00m
-  18 |     \x1b[34mdef\x1b[39;49;00m \x1b[32mfoo\x1b[39;49;00m():\x1b[37m\x1b[39;49;00m
+  18 |     \x1b[34mdef\x1b[39;49;00m\x1b[37m \x1b[39;49;00m\x1b[32mfoo\x1b[39;49;00m():\x1b[37m\x1b[39;49;00m
   19 |         \x1b[34mpass\x1b[39;49;00m\x1b[37m\x1b[39;49;00m
 -----
-  25 | \x1b[34mdef\x1b[39;49;00m \x1b[32mdeco\x1b[39;49;00m(f):\x1b[37m\x1b[39;49;00m
+  25 | \x1b[34mdef\x1b[39;49;00m\x1b[37m \x1b[39;49;00m\x1b[32mdeco\x1b[39;49;00m(f):\x1b[37m\x1b[39;49;00m
   26 |     f.result = print_stack()\x1b[37m\x1b[39;49;00m
   27 |     \x1b[34mreturn\x1b[39;49;00m f\x1b[37m\x1b[39;49;00m
 -----
@@ -702,14 +702,14 @@ def test_pygments_example():
 
 TerminalTrueColorFormatter native:
 
-  13 | \x1b[38;2;110;191;38;01mdef\x1b[39;00m\x1b[38;2;208;208;208m \x1b[39m\x1b[38;2;113;173;255mbar\x1b[39m\x1b[38;2;208;208;208m(\x1b[39m\x1b[38;2;208;208;208m)\x1b[39m\x1b[38;2;208;208;208m:\x1b[39m
+  13 | \x1b[38;2;110;191;38;01mdef\x1b[39;00m\x1b[38;2;102;102;102m \x1b[39m\x1b[38;2;113;173;255mbar\x1b[39m\x1b[38;2;208;208;208m(\x1b[39m\x1b[38;2;208;208;208m)\x1b[39m\x1b[38;2;208;208;208m:\x1b[39m
   14 | \x1b[38;2;208;208;208m    \x1b[39m\x1b[38;2;208;208;208mx\x1b[39m\x1b[38;2;208;208;208m \x1b[39m\x1b[38;2;208;208;208m=\x1b[39m\x1b[38;2;208;208;208m \x1b[39m\x1b[38;2;81;178;253m1\x1b[39m
   15 | \x1b[38;2;208;208;208m    \x1b[39m\x1b[38;2;47;188;205mstr\x1b[39m\x1b[38;2;208;208;208m(\x1b[39m\x1b[38;2;208;208;208mx\x1b[39m\x1b[38;2;208;208;208m)\x1b[39m
   17 | \x1b[38;2;208;208;208m    \x1b[39m\x1b[38;2;255;165;0m@deco\x1b[39m
-  18 | \x1b[38;2;208;208;208m    \x1b[39m\x1b[38;2;110;191;38;01mdef\x1b[39;00m\x1b[38;2;208;208;208m \x1b[39m\x1b[38;2;113;173;255mfoo\x1b[39m\x1b[38;2;208;208;208m(\x1b[39m\x1b[38;2;208;208;208m)\x1b[39m\x1b[38;2;208;208;208m:\x1b[39m
+  18 | \x1b[38;2;208;208;208m    \x1b[39m\x1b[38;2;110;191;38;01mdef\x1b[39;00m\x1b[38;2;102;102;102m \x1b[39m\x1b[38;2;113;173;255mfoo\x1b[39m\x1b[38;2;208;208;208m(\x1b[39m\x1b[38;2;208;208;208m)\x1b[39m\x1b[38;2;208;208;208m:\x1b[39m
   19 | \x1b[38;2;208;208;208m        \x1b[39m\x1b[38;2;110;191;38;01mpass\x1b[39;00m
 -----
-  25 | \x1b[38;2;110;191;38;01mdef\x1b[39;00m\x1b[38;2;208;208;208m \x1b[39m\x1b[38;2;113;173;255mdeco\x1b[39m\x1b[38;2;208;208;208m(\x1b[39m\x1b[38;2;208;208;208mf\x1b[39m\x1b[38;2;208;208;208m)\x1b[39m\x1b[38;2;208;208;208m:\x1b[39m
+  25 | \x1b[38;2;110;191;38;01mdef\x1b[39;00m\x1b[38;2;102;102;102m \x1b[39m\x1b[38;2;113;173;255mdeco\x1b[39m\x1b[38;2;208;208;208m(\x1b[39m\x1b[38;2;208;208;208mf\x1b[39m\x1b[38;2;208;208;208m)\x1b[39m\x1b[38;2;208;208;208m:\x1b[39m
   26 | \x1b[38;2;208;208;208m    \x1b[39m\x1b[38;2;208;208;208mf\x1b[39m\x1b[38;2;208;208;208m.\x1b[39m\x1b[38;2;208;208;208mresult\x1b[39m\x1b[38;2;208;208;208m \x1b[39m\x1b[38;2;208;208;208m=\x1b[39m\x1b[38;2;208;208;208m \x1b[39m\x1b[38;2;208;208;208mprint_stack\x1b[39m\x1b[38;2;208;208;208m(\x1b[39m\x1b[38;2;208;208;208m)\x1b[39m
   27 | \x1b[38;2;208;208;208m    \x1b[39m\x1b[38;2;110;191;38;01mreturn\x1b[39;00m\x1b[38;2;208;208;208m \x1b[39m\x1b[38;2;208;208;208mf\x1b[39m
 -----
@@ -718,14 +718,14 @@ def test_pygments_example():
 
 TerminalTrueColorFormatter <class \'stack_data.core.style_with_executing_node.<locals>.NewStyle\'>:
 
-  13 | \x1b[38;2;110;191;38;01mdef\x1b[39;00m\x1b[38;2;208;208;208m \x1b[39m\x1b[38;2;113;173;255mbar\x1b[39m\x1b[38;2;208;208;208m(\x1b[39m\x1b[38;2;208;208;208m)\x1b[39m\x1b[38;2;208;208;208m:\x1b[39m
+  13 | \x1b[38;2;110;191;38;01mdef\x1b[39;00m\x1b[38;2;102;102;102m \x1b[39m\x1b[38;2;113;173;255mbar\x1b[39m\x1b[38;2;208;208;208m(\x1b[39m\x1b[38;2;208;208;208m)\x1b[39m\x1b[38;2;208;208;208m:\x1b[39m
   14 | \x1b[38;2;208;208;208m    \x1b[39m\x1b[38;2;208;208;208mx\x1b[39m\x1b[38;2;208;208;208m \x1b[39m\x1b[38;2;208;208;208m=\x1b[39m\x1b[38;2;208;208;208m \x1b[39m\x1b[38;2;81;178;253m1\x1b[39m
   15 | \x1b[38;2;208;208;208m    \x1b[39m\x1b[38;2;47;188;205mstr\x1b[39m\x1b[38;2;208;208;208m(\x1b[39m\x1b[38;2;208;208;208mx\x1b[39m\x1b[38;2;208;208;208m)\x1b[39m
   17 | \x1b[38;2;208;208;208;48;2;68;68;0m    \x1b[39;49m\x1b[38;2;255;165;0;48;2;68;68;0m@deco\x1b[39;49m
-  18 | \x1b[38;2;208;208;208;48;2;68;68;0m    \x1b[39;49m\x1b[38;2;110;191;38;48;2;68;68;0;01mdef\x1b[39;49;00m\x1b[38;2;208;208;208;48;2;68;68;0m \x1b[39;49m\x1b[38;2;113;173;255;48;2;68;68;0mfoo\x1b[39;49m\x1b[38;2;208;208;208;48;2;68;68;0m(\x1b[39;49m\x1b[38;2;208;208;208;48;2;68;68;0m)\x1b[39;49m\x1b[38;2;208;208;208;48;2;68;68;0m:\x1b[39;49m
+  18 | \x1b[38;2;208;208;208;48;2;68;68;0m    \x1b[39;49m\x1b[38;2;110;191;38;48;2;68;68;0;01mdef\x1b[39;49;00m\x1b[38;2;102;102;102;48;2;68;68;0m \x1b[39;49m\x1b[38;2;113;173;255;48;2;68;68;0mfoo\x1b[39;49m\x1b[38;2;208;208;208;48;2;68;68;0m(\x1b[39;49m\x1b[38;2;208;208;208;48;2;68;68;0m)\x1b[39;49m\x1b[38;2;208;208;208;48;2;68;68;0m:\x1b[39;49m
   19 | \x1b[38;2;208;208;208;48;2;68;68;0m        \x1b[39;49m\x1b[38;2;110;191;38;48;2;68;68;0;01mpass\x1b[39;49;00m
 -----
-  25 | \x1b[38;2;110;191;38;01mdef\x1b[39;00m\x1b[38;2;208;208;208m \x1b[39m\x1b[38;2;113;173;255mdeco\x1b[39m\x1b[38;2;208;208;208m(\x1b[39m\x1b[38;2;208;208;208mf\x1b[39m\x1b[38;2;208;208;208m)\x1b[39m\x1b[38;2;208;208;208m:\x1b[39m
+  25 | \x1b[38;2;110;191;38;01mdef\x1b[39;00m\x1b[38;2;102;102;102m \x1b[39m\x1b[38;2;113;173;255mdeco\x1b[39m\x1b[38;2;208;208;208m(\x1b[39m\x1b[38;2;208;208;208mf\x1b[39m\x1b[38;2;208;208;208m)\x1b[39m\x1b[38;2;208;208;208m:\x1b[39m
   26 | \x1b[38;2;208;208;208m    \x1b[39m\x1b[38;2;208;208;208mf\x1b[39m\x1b[38;2;208;208;208m.\x1b[39m\x1b[38;2;208;208;208mresult\x1b[39m\x1b[38;2;208;208;208m \x1b[39m\x1b[38;2;208;208;208m=\x1b[39m\x1b[38;2;208;208;208m \x1b[39m\x1b[38;2;208;208;208;48;2;68;68;0mprint_stack\x1b[39;49m\x1b[38;2;208;208;208;48;2;68;68;0m(\x1b[39;49m\x1b[38;2;208;208;208;48;2;68;68;0m)\x1b[39;49m
   27 | \x1b[38;2;208;208;208m    \x1b[39m\x1b[38;2;110;191;38;01mreturn\x1b[39;00m\x1b[38;2;208;208;208m \x1b[39m\x1b[38;2;208;208;208mf\x1b[39m
 -----
@@ -734,14 +734,14 @@ def test_pygments_example():
 
 HtmlFormatter native:
 
-  13 | <span class="k">def</span> <span class="nf">bar</span><span class="p">():</span>
+  13 | <span class="k">def</span><span class="w"> </span><span class="nf">bar</span><span class="p">():</span>
   14 |     <span class="n">x</span> <span class="o">=</span> <span class="mi">1</span>
   15 |     <span class="nb">str</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
   17 |     <span class="nd">@deco</span>
-  18 |     <span class="k">def</span> <span class="nf">foo</span><span class="p">():</span>
+  18 |     <span class="k">def</span><span class="w"> </span><span class="nf">foo</span><span class="p">():</span>
   19 |         <span class="k">pass</span>
 -----
-  25 | <span class="k">def</span> <span class="nf">deco</span><span class="p">(</span><span class="n">f</span><span class="p">):</span>
+  25 | <span class="k">def</span><span class="w"> </span><span class="nf">deco</span><span class="p">(</span><span class="n">f</span><span class="p">):</span>
   26 |     <span class="n">f</span><span class="o">.</span><span class="n">result</span> <span class="o">=</span> <span class="n">print_stack</span><span class="p">()</span>
   27 |     <span class="k">return</span> <span class="n">f</span>
 -----
@@ -750,14 +750,14 @@ def test_pygments_example():
 
 HtmlFormatter <class \'stack_data.core.style_with_executing_node.<locals>.NewStyle\'>:
 
-  13 | <span class="k">def</span> <span class="nf">bar</span><span class="p">():</span>
+  13 | <span class="k">def</span><span class="w"> </span><span class="nf">bar</span><span class="p">():</span>
   14 |     <span class="n">x</span> <span class="o">=</span> <span class="mi">1</span>
   15 |     <span class="nb">str</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
   17 | <span class=" -ExecutingNode">    </span><span class="nd nd-ExecutingNode">@deco</span>
-  18 | <span class=" -ExecutingNode">    </span><span class="k k-ExecutingNode">def</span><span class=" -ExecutingNode"> </span><span class="nf nf-ExecutingNode">foo</span><span class="p p-ExecutingNode">():</span>
+  18 | <span class=" -ExecutingNode">    </span><span class="k k-ExecutingNode">def</span><span class="w w-ExecutingNode"> </span><span class="nf nf-ExecutingNode">foo</span><span class="p p-ExecutingNode">():</span>
   19 | <span class=" -ExecutingNode">        </span><span class="k k-ExecutingNode">pass</span>
 -----
-  25 | <span class="k">def</span> <span class="nf">deco</span><span class="p">(</span><span class="n">f</span><span class="p">):</span>
+  25 | <span class="k">def</span><span class="w"> </span><span class="nf">deco</span><span class="p">(</span><span class="n">f</span><span class="p">):</span>
   26 |     <span class="n">f</span><span class="o">.</span><span class="n">result</span> <span class="o">=</span> <span class="n n-ExecutingNode">print_stack</span><span class="p p-ExecutingNode">()</span>
   27 |     <span class="k">return</span> <span class="n">f</span>
 -----
diff --git a/tests/utils.py b/tests/utils.py
index 1500086..078b85b 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -8,7 +8,7 @@ def parse_version(version: str):
     return tuple(int(x) for x in version.split("."))
 
 
-old_pygments = parse_version(pygments.__version__) < (2, 16, 1)
+old_pygments = parse_version(pygments.__version__) < (2, 19, 0)
 
 
 def compare_to_file(text, name):