diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index d297754a1e..5d7e0e60df 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -108,8 +108,8 @@ jobs:
           $IMAGE_TAG \
           /usr/src/tdesktop/Telegram/build/docker/centos_env/build.sh \
           -D CMAKE_CONFIGURATION_TYPES=Debug \
-          -D CMAKE_C_FLAGS_DEBUG="-O0 -U_FORTIFY_SOURCE" \
-          -D CMAKE_CXX_FLAGS_DEBUG="-O0 -U_FORTIFY_SOURCE" \
+          -D CMAKE_C_FLAGS_DEBUG="-O0" \
+          -D CMAKE_CXX_FLAGS_DEBUG="-O0" \
           -D CMAKE_EXE_LINKER_FLAGS="-s" \
           -D CMAKE_COMPILE_WARNING_AS_ERROR=ON \
           -D TDESKTOP_API_TEST=ON \
diff --git a/Telegram/SourceFiles/_other/updater_linux.cpp b/Telegram/SourceFiles/_other/updater_linux.cpp
index 58bc10efad..67b74453e1 100644
--- a/Telegram/SourceFiles/_other/updater_linux.cpp
+++ b/Telegram/SourceFiles/_other/updater_linux.cpp
@@ -5,6 +5,7 @@ the official desktop application for the Telegram messaging service.
 For license and copyright information please follow this link:
 https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
+#define _GLIBCXX_USE_CXX11_ABI 0
 #include <cstdio>
 #include <sys/stat.h>
 #include <sys/types.h>
diff --git a/Telegram/build/docker/centos_env/Dockerfile b/Telegram/build/docker/centos_env/Dockerfile
index 64f2714d0f..4bbfe1f809 100644
--- a/Telegram/build/docker/centos_env/Dockerfile
+++ b/Telegram/build/docker/centos_env/Dockerfile
@@ -1,7 +1,7 @@
 {%- set GIT = "https://github.com" -%}
 {%- set GIT_FREEDESKTOP = GIT ~ "/gitlab-freedesktop-mirrors" -%}
 {%- set GIT_UPDATE_M4 = "git submodule set-url m4 https://gitlab.freedesktop.org/xorg/util/xcb-util-m4 && git submodule update --init --recursive --depth=1" -%}
-{%- set TOOLSET = "gcc-toolset-12" -%}
+{%- set TOOLSET = "gcc-toolset-14" -%}
 {%- set QT = "6.9.0" -%}
 {%- set QT_TAG = "v" ~ QT -%}
 {%- set LibrariesPath = "/usr/src/Libraries" -%}
@@ -26,7 +26,7 @@ RUN dnf -y install epel-release \
 		alsa-lib-devel pulseaudio-libs-devel mesa-libGL-devel mesa-libEGL-devel \
 		mesa-libgbm-devel libdrm-devel vulkan-devel libva-devel libvdpau-devel \
 		glib2-devel gobject-introspection-devel at-spi2-core-devel gtk3-devel \
-		boost1.78-devel fmt-devel \
+		boost1.78-devel \
 	&& dnf clean all
 
 RUN alternatives --set python3 /usr/bin/python3.11
@@ -39,7 +39,7 @@ WORKDIR {{ LibrariesPath }}
 ENV AR gcc-ar
 ENV RANLIB gcc-ranlib
 ENV NM gcc-nm
-ENV CFLAGS {% if DEBUG %}-g{% endif %} -O3 {% if LTO %}-flto=auto -ffat-lto-objects{% endif %} -pipe -fPIC -fno-strict-aliasing -fexceptions -fasynchronous-unwind-tables -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -fstack-protector-strong -fstack-clash-protection -fcf-protection -D_FORTIFY_SOURCE=3 -D_GLIBCXX_ASSERTIONS
+ENV CFLAGS {% if DEBUG %}-g{% endif %} -O3 {% if LTO %}-flto=auto -ffat-lto-objects{% endif %} -pipe -fPIC -fno-strict-aliasing -fexceptions -fasynchronous-unwind-tables -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -fhardened -Wno-hardened
 ENV CXXFLAGS $CFLAGS
 
 ENV CMAKE_GENERATOR Ninja