diff --git a/SPECS/Cython/Cython.spec b/SPECS/Cython/Cython.spec
index e4298554352..f6c0ac3e236 100644
--- a/SPECS/Cython/Cython.spec
+++ b/SPECS/Cython/Cython.spec
@@ -3,7 +3,7 @@ Cython is an optimising static compiler for both the Python programming language
 Summary:        Language for writing Python extension modules
 Name:           Cython
 Version:        3.0.5
-Release:        2%{?dist}
+Release:        3%{?dist}
 License:        Apache-2.0
 Vendor:         Microsoft Corporation
 Distribution:   Azure Linux
@@ -40,13 +40,17 @@ Provides:       %{name}%{?_isa} = %{version}-%{release}
 rm -rf %{buildroot}%{python3_sitelib}/setuptools/tests
 
 %check
-pip3 install -r test-requirements-312.txt
+pip3 install -r test-requirements-312.txt 
+
+# Fix upstream flake8 E502 (redundant backslash between brackets)
+sed -i '/\\$/s/\\$//' Cython/Build/IpythonMagic.py
+
 # Skip the file based tests, since they typically take over 5 hours to run.
 %python3 runtests.py -vv --no-file
 
 %files -n python3-%{name}
 %license LICENSE.txt COPYING.txt
-%doc *.txt Demos docs Tools
+%doc Demos docs Tools
 %{_bindir}/cython
 %{_bindir}/cygdb
 %{_bindir}/cythonize
@@ -57,6 +61,9 @@ pip3 install -r test-requirements-312.txt
 %{python3_sitearch}/__pycache__/cython.*
 
 %changelog
+* Tue Apr 28 2026 Akarsh Chaudhary <v-akarshc@microsoft.com> - 3.0.5-3
+- Applied sed-based fix in %check to remove redundant backslash (E502) in IpythonMagic.py, enabling TestCodeFormat to pass successfully.
+
 * Thu Mar 21 2024 Andrew Phelps <anphel@microsoft.com> - 3.0.5-2
 - Switch to test-requirements-312.txt
 - Skip long-running file based tests
diff --git a/toolkit/resources/manifests/package/toolchain_aarch64.txt b/toolkit/resources/manifests/package/toolchain_aarch64.txt
index fbcebd0b0b0..412e9d3089f 100644
--- a/toolkit/resources/manifests/package/toolchain_aarch64.txt
+++ b/toolkit/resources/manifests/package/toolchain_aarch64.txt
@@ -71,7 +71,7 @@ curl-8.11.1-6.azl3.aarch64.rpm
 curl-debuginfo-8.11.1-6.azl3.aarch64.rpm
 curl-devel-8.11.1-6.azl3.aarch64.rpm
 curl-libs-8.11.1-6.azl3.aarch64.rpm
-Cython-debuginfo-3.0.5-2.azl3.aarch64.rpm
+Cython-debuginfo-3.0.5-3.azl3.aarch64.rpm
 debugedit-5.0-2.azl3.aarch64.rpm
 debugedit-debuginfo-5.0-2.azl3.aarch64.rpm
 diffutils-3.10-1.azl3.aarch64.rpm
@@ -535,7 +535,7 @@ python3-3.12.9-10.azl3.aarch64.rpm
 python3-audit-3.1.2-1.azl3.aarch64.rpm
 python3-cracklib-2.9.11-1.azl3.aarch64.rpm
 python3-curses-3.12.9-10.azl3.aarch64.rpm
-python3-Cython-3.0.5-2.azl3.aarch64.rpm
+python3-Cython-3.0.5-3.azl3.aarch64.rpm
 python3-debuginfo-3.12.9-10.azl3.aarch64.rpm
 python3-devel-3.12.9-10.azl3.aarch64.rpm
 python3-flit-core-3.9.0-1.azl3.noarch.rpm
diff --git a/toolkit/resources/manifests/package/toolchain_x86_64.txt b/toolkit/resources/manifests/package/toolchain_x86_64.txt
index 619f1cffaec..0a08a4a3b10 100644
--- a/toolkit/resources/manifests/package/toolchain_x86_64.txt
+++ b/toolkit/resources/manifests/package/toolchain_x86_64.txt
@@ -76,7 +76,7 @@ curl-8.11.1-6.azl3.x86_64.rpm
 curl-debuginfo-8.11.1-6.azl3.x86_64.rpm
 curl-devel-8.11.1-6.azl3.x86_64.rpm
 curl-libs-8.11.1-6.azl3.x86_64.rpm
-Cython-debuginfo-3.0.5-2.azl3.x86_64.rpm
+Cython-debuginfo-3.0.5-3.azl3.x86_64.rpm
 debugedit-5.0-2.azl3.x86_64.rpm
 debugedit-debuginfo-5.0-2.azl3.x86_64.rpm
 diffutils-3.10-1.azl3.x86_64.rpm
@@ -543,7 +543,7 @@ python3-3.12.9-10.azl3.x86_64.rpm
 python3-audit-3.1.2-1.azl3.x86_64.rpm
 python3-cracklib-2.9.11-1.azl3.x86_64.rpm
 python3-curses-3.12.9-10.azl3.x86_64.rpm
-python3-Cython-3.0.5-2.azl3.x86_64.rpm
+python3-Cython-3.0.5-3.azl3.x86_64.rpm
 python3-debuginfo-3.12.9-10.azl3.x86_64.rpm
 python3-devel-3.12.9-10.azl3.x86_64.rpm
 python3-flit-core-3.9.0-1.azl3.noarch.rpm