diff --git a/docs/main/changelog.rst b/docs/main/changelog.rst
index 444b35e9..ccba5fe8 100644
--- a/docs/main/changelog.rst
+++ b/docs/main/changelog.rst
@@ -7,6 +7,10 @@ that were made in every particular version.
 From version 0.7.6 *Dependency Injector* framework strictly 
 follows `Semantic versioning`_
 
+Development version
+-------------------
+- Regenerate C sources using Cython 0.28.5.
+
 3.13.2
 ------
 - Add additional benchmark of ``Factory`` provider.
diff --git a/requirements-dev.txt b/requirements-dev.txt
index e7f64b12..eee8cfc3 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,4 +1,4 @@
-cython==0.28.4
+cython==0.28.5
 tox
 unittest2
 coverage
diff --git a/src/dependency_injector/containers.c b/src/dependency_injector/containers.c
index 13e1cbc7..72a2c2ea 100644
--- a/src/dependency_injector/containers.c
+++ b/src/dependency_injector/containers.c
@@ -1,4 +1,4 @@
-/* Generated by Cython 0.28.4 */
+/* Generated by Cython 0.28.5 */
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
@@ -7,7 +7,7 @@
 #elif PY_VERSION_HEX < 0x02060000 || (0x03000000 <= PY_VERSION_HEX && PY_VERSION_HEX < 0x03030000)
     #error Cython requires Python 2.6+ or Python 3.3+.
 #else
-#define CYTHON_ABI "0_28_4"
+#define CYTHON_ABI "0_28_5"
 #define CYTHON_FUTURE_DIVISION 0
 #include <stddef.h>
 #ifndef offsetof
@@ -11456,7 +11456,7 @@ static int __Pyx_modinit_function_import_code(void) {
 #if defined(__clang__)
     #define CYTHON_SMALL_CODE
 #elif defined(__GNUC__) && (!(defined(__cplusplus)) || (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 4)))
-    #define CYTHON_SMALL_CODE __attribute__((optimize("Os")))
+    #define CYTHON_SMALL_CODE __attribute__((cold))
 #else
     #define CYTHON_SMALL_CODE
 #endif
diff --git a/src/dependency_injector/providers.c b/src/dependency_injector/providers.c
index 02de330f..e1c13ef8 100644
--- a/src/dependency_injector/providers.c
+++ b/src/dependency_injector/providers.c
@@ -1,4 +1,4 @@
-/* Generated by Cython 0.28.4 */
+/* Generated by Cython 0.28.5 */
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
@@ -7,7 +7,7 @@
 #elif PY_VERSION_HEX < 0x02060000 || (0x03000000 <= PY_VERSION_HEX && PY_VERSION_HEX < 0x03030000)
     #error Cython requires Python 2.6+ or Python 3.3+.
 #else
-#define CYTHON_ABI "0_28_4"
+#define CYTHON_ABI "0_28_5"
 #define CYTHON_FUTURE_DIVISION 0
 #include <stddef.h>
 #ifndef offsetof
@@ -56189,7 +56189,7 @@ static int __Pyx_modinit_function_import_code(void) {
 #if defined(__clang__)
     #define CYTHON_SMALL_CODE
 #elif defined(__GNUC__) && (!(defined(__cplusplus)) || (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 4)))
-    #define CYTHON_SMALL_CODE __attribute__((optimize("Os")))
+    #define CYTHON_SMALL_CODE __attribute__((cold))
 #else
     #define CYTHON_SMALL_CODE
 #endif