diff --git a/build/pkgs/cython/checksums.ini b/build/pkgs/cython/checksums.ini
index 5d0bc66c242..a728e447c9b 100644
--- a/build/pkgs/cython/checksums.ini
+++ b/build/pkgs/cython/checksums.ini
@@ -1,5 +1,5 @@
 tarball=Cython-VERSION.tar.gz
-sha1=08eb99f7c95b7ca667b1547575e7369d8064b4b3
-md5=00def3f2b96c393098e01eb2f1f169ad
-cksum=2321746451
+sha1=9924cb41152a854124c264e2046b3d48ec8207a5
+md5=9bafc611be35748b17a62f47bc479b35
+cksum=1074764487
 upstream_url=https://pypi.io/packages/source/C/Cython/Cython-VERSION.tar.gz
diff --git a/build/pkgs/cython/package-version.txt b/build/pkgs/cython/package-version.txt
index b5021469305..b0f2dcb32fc 100644
--- a/build/pkgs/cython/package-version.txt
+++ b/build/pkgs/cython/package-version.txt
@@ -1 +1 @@
-3.0.2
+3.0.4
diff --git a/build/pkgs/cython/patches/5690.patch b/build/pkgs/cython/patches/5690.patch
deleted file mode 100644
index cc927879e1f..00000000000
--- a/build/pkgs/cython/patches/5690.patch
+++ /dev/null
@@ -1,48 +0,0 @@
-diff --git a/Cython/Debugger/DebugWriter.py b/Cython/Debugger/DebugWriter.py
-index 8b1fb75b027..2c3c310fc64 100644
---- a/Cython/Debugger/DebugWriter.py
-+++ b/Cython/Debugger/DebugWriter.py
-@@ -18,6 +18,21 @@
-             etree = None
- 
- from ..Compiler import Errors
-+from ..Compiler.StringEncoding import EncodedString
-+
-+
-+def is_valid_tag(name):
-+    """
-+    Names like '.0' are used internally for arguments
-+    to functions creating generator expressions,
-+    however they are not identifiers.
-+
-+    See https://github.com/cython/cython/issues/5552
-+    """
-+    if isinstance(name, EncodedString):
-+        if name.startswith(".") and name[1:].isdecimal():
-+            return False
-+    return True
- 
- 
- class CythonDebugWriter(object):
-@@ -39,14 +54,17 @@ def __init__(self, output_dir):
-         self.start('cython_debug', attrs=dict(version='1.0'))
- 
-     def start(self, name, attrs=None):
--        self.tb.start(name, attrs or {})
-+        if is_valid_tag(name):
-+            self.tb.start(name, attrs or {})
- 
-     def end(self, name):
--        self.tb.end(name)
-+        if is_valid_tag(name):
-+            self.tb.end(name)
- 
-     def add_entry(self, name, **attrs):
--        self.tb.start(name, attrs)
--        self.tb.end(name)
-+        if is_valid_tag(name):
-+            self.tb.start(name, attrs)
-+            self.tb.end(name)
- 
-     def serialize(self):
-         self.tb.end('Module')