diff --git a/pylib/anki/BUILD.bazel b/pylib/anki/BUILD.bazel
index 84b29dcc5..4a24cec0f 100644
--- a/pylib/anki/BUILD.bazel
+++ b/pylib/anki/BUILD.bazel
@@ -24,7 +24,7 @@ _py_srcs = glob(
     exclude = [
         "hooks_gen.py",
     ],
-)
+) + ["//pylib/anki/_vendor"]
 
 py_library(
     name = "anki",
@@ -49,7 +49,7 @@ py_library(
         requirement("flask"),
         requirement("waitress"),
         requirement("markdown"),
-        requirement("stringcase"),
+        "//pylib/anki/_vendor:stringcase",
     ] + orjson_if_available(),
 )
 
diff --git a/pylib/anki/_backend/BUILD.bazel b/pylib/anki/_backend/BUILD.bazel
index e60346b55..a4f54cddc 100644
--- a/pylib/anki/_backend/BUILD.bazel
+++ b/pylib/anki/_backend/BUILD.bazel
@@ -10,7 +10,7 @@ py_binary(
     ],
     deps = [
         requirement("black"),
-        requirement("stringcase"),
+        "//pylib/anki/_vendor:stringcase",
         requirement("protobuf"),
         "//pylib/anki:proto",
     ],
@@ -30,7 +30,7 @@ py_binary(
     ],
     deps = [
         requirement("black"),
-        requirement("stringcase"),
+        "//pylib/anki/_vendor:stringcase",
     ],
 )
 
diff --git a/pylib/anki/_legacy.py b/pylib/anki/_legacy.py
index 1c46bea3d..f38ba41c3 100644
--- a/pylib/anki/_legacy.py
+++ b/pylib/anki/_legacy.py
@@ -9,7 +9,7 @@ import pathlib
 import traceback
 from typing import Any, Callable, Union, no_type_check
 
-import stringcase
+from anki._vendor import stringcase
 
 VariableTarget = tuple[Any, str]
 DeprecatedAliasTarget = Union[Callable, VariableTarget]
diff --git a/pylib/anki/_vendor/BUILD.bazel b/pylib/anki/_vendor/BUILD.bazel
new file mode 100644
index 000000000..15d475f7e
--- /dev/null
+++ b/pylib/anki/_vendor/BUILD.bazel
@@ -0,0 +1,18 @@
+# export stringcase as a separate python library as well, as our build tools need it
+py_library(
+    name = "stringcase",
+    srcs = ["stringcase.py"],
+    imports = [
+        ".",
+    ],
+    visibility = ["//visibility:public"],
+)
+
+filegroup(
+    name = "_vendor",
+    srcs = [
+        "__init__.py",
+        "stringcase.py",
+    ],
+    visibility = ["//pylib:__subpackages__"],
+)
diff --git a/pylib/anki/_vendor/__init__.py b/pylib/anki/_vendor/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/pylib/anki/_vendor/stringcase.py b/pylib/anki/_vendor/stringcase.py
new file mode 100644
index 000000000..517e43dbc
--- /dev/null
+++ b/pylib/anki/_vendor/stringcase.py
@@ -0,0 +1,257 @@
+# stringcase 1.2.0 with python warning fix applied
+# MIT: https://github.com/okunishinishi/python-stringcase
+
+# type: ignore
+
+"""
+String convert functions
+"""
+
+import re
+
+
+def camelcase(string):
+    """Convert string into camel case.
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Camel case string.
+
+    """
+
+    string = re.sub(r"\w[\s\W]+\w", "", str(string))
+    if not string:
+        return string
+    return lowercase(string[0]) + re.sub(
+        r"[\-_\.\s]([a-z])", lambda matched: uppercase(matched.group(1)), string[1:]
+    )
+
+
+def capitalcase(string):
+    """Convert string into capital case.
+    First letters will be uppercase.
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Capital case string.
+
+    """
+
+    string = str(string)
+    if not string:
+        return string
+    return uppercase(string[0]) + string[1:]
+
+
+def constcase(string):
+    """Convert string into upper snake case.
+    Join punctuation with underscore and convert letters into uppercase.
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Const cased string.
+
+    """
+
+    return uppercase(snakecase(string))
+
+
+def lowercase(string):
+    """Convert string into lower case.
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Lowercase case string.
+
+    """
+
+    return str(string).lower()
+
+
+def pascalcase(string):
+    """Convert string into pascal case.
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Pascal case string.
+
+    """
+
+    return capitalcase(camelcase(string))
+
+
+def pathcase(string):
+    """Convert string into path case.
+    Join punctuation with slash.
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Path cased string.
+
+    """
+    string = snakecase(string)
+    if not string:
+        return string
+    return re.sub(r"_", "/", string)
+
+
+def backslashcase(string):
+    """Convert string into spinal case.
+    Join punctuation with backslash.
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Spinal cased string.
+
+    """
+    str1 = re.sub(r"_", r"\\", snakecase(string))
+
+    return str1
+    # return re.sub(r"\\n", "", str1))  # TODO: make regex fot \t ...
+
+
+def sentencecase(string):
+    """Convert string into sentence case.
+    First letter capped and each punctuations are joined with space.
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Sentence cased string.
+
+    """
+    joiner = " "
+    string = re.sub(r"[\-_\.\s]", joiner, str(string))
+    if not string:
+        return string
+    return capitalcase(
+        trimcase(
+            re.sub(
+                r"[A-Z]", lambda matched: joiner + lowercase(matched.group(0)), string
+            )
+        )
+    )
+
+
+def snakecase(string):
+    """Convert string into snake case.
+    Join punctuation with underscore
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Snake cased string.
+
+    """
+
+    string = re.sub(r"[\-\.\s]", "_", str(string))
+    if not string:
+        return string
+    return lowercase(string[0]) + re.sub(
+        r"[A-Z]", lambda matched: "_" + lowercase(matched.group(0)), string[1:]
+    )
+
+
+def spinalcase(string):
+    """Convert string into spinal case.
+    Join punctuation with hyphen.
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Spinal cased string.
+
+    """
+
+    return re.sub(r"_", "-", snakecase(string))
+
+
+def dotcase(string):
+
+    """Convert string into dot case.
+    Join punctuation with dot.
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Dot cased string.
+
+    """
+
+    return re.sub(r"_", ".", snakecase(string))
+
+
+def titlecase(string):
+    """Convert string into sentence case.
+    First letter capped while each punctuations is capitalsed
+    and joined with space.
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Title cased string.
+
+    """
+
+    return " ".join([capitalcase(word) for word in snakecase(string).split("_")])
+
+
+def trimcase(string):
+    """Convert string into trimmed string.
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Trimmed case string
+    """
+
+    return str(string).strip()
+
+
+def uppercase(string):
+    """Convert string into upper case.
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Uppercase case string.
+
+    """
+
+    return str(string).upper()
+
+
+def alphanumcase(string):
+    """Cuts all non-alphanumeric symbols,
+    i.e. cuts all expect except 0-9, a-z and A-Z.
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: String with cutted non-alphanumeric symbols.
+
+    """
+    # return filter(str.isalnum, str(string))
+    return re.sub(r"\W+", "", string)
diff --git a/pylib/tools/BUILD.bazel b/pylib/tools/BUILD.bazel
index 3c97bdc7c..ef417a112 100644
--- a/pylib/tools/BUILD.bazel
+++ b/pylib/tools/BUILD.bazel
@@ -42,7 +42,7 @@ py_binary(
     visibility = ["//pylib:__subpackages__"],
     deps = [
         requirement("black"),
-        requirement("stringcase"),
+        "//pylib/anki/_vendor:stringcase",
     ],
 )
 
@@ -53,7 +53,7 @@ py_binary(
     ],
     tags = ["manual"],
     deps = [
-        requirement("stringcase"),
+        "//pylib/anki/_vendor:stringcase",
     ],
 )
 
diff --git a/python/requirements.in b/python/requirements.in
index d364223ab..1fcc4aa62 100644
--- a/python/requirements.in
+++ b/python/requirements.in
@@ -19,7 +19,6 @@ pytest
 requests[socks]
 send2trash
 snakeviz
-stringcase
 waitress>=2.0.0
 fluent.syntax
 types-decorator
diff --git a/python/requirements.txt b/python/requirements.txt
index 44f65b4c1..ffec3e97a 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -129,8 +129,6 @@ snakeviz==2.1.0
     # via -r requirements.in
 soupsieve==2.2.1
     # via beautifulsoup4
-stringcase==1.2.0
-    # via -r requirements.in
 toml==0.10.2
     # via
     #   mypy
diff --git a/qt/BUILD.bazel b/qt/BUILD.bazel
index 0344f763c..9413bc92c 100644
--- a/qt/BUILD.bazel
+++ b/qt/BUILD.bazel
@@ -11,7 +11,7 @@ py_binary(
     deps = [
         "//pylib/tools:hookslib",
         requirement("black"),
-        requirement("stringcase"),
+        "//pylib/anki/_vendor:stringcase",
     ],
 )
 
diff --git a/scripts/copyright_headers.py b/scripts/copyright_headers.py
index cf50238a4..20f117417 100644
--- a/scripts/copyright_headers.py
+++ b/scripts/copyright_headers.py
@@ -6,12 +6,13 @@ import sys
 from pathlib import Path
 
 nonstandard_header = {
-    "python/pyqt5/install_pyqt5.py",
-    "python/pyqt6/install_pyqt6.py",
+    "pylib/anki/_vendor/stringcase.py",
     "pylib/anki/importing/pauker.py",
     "pylib/anki/importing/supermemo_xml.py",
     "pylib/anki/statsbg.py",
     "pylib/tools/protoc-gen-mypy.py",
+    "python/pyqt5/install_pyqt5.py",
+    "python/pyqt6/install_pyqt6.py",
     "qt/aqt/mpv.py",
     "qt/aqt/winpaths.py",
 }
diff --git a/ts/lib/BUILD.bazel b/ts/lib/BUILD.bazel
index 14bb8df24..9992053cc 100644
--- a/ts/lib/BUILD.bazel
+++ b/ts/lib/BUILD.bazel
@@ -13,9 +13,10 @@ py_binary(
     ],
     deps = [
         requirement("black"),
-        requirement("stringcase"),
+        "//pylib/anki/_vendor:stringcase",
     ],
 )
+
 _i18n_generated = [
     "ftl.ts",
     "i18n/modules.ts",