diff --git a/.gitmodules b/.gitmodules
index 20bf11a83..26294499d 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -97,3 +97,6 @@
 [submodule "Telegram/ThirdParty/kwayland"]
 	path = Telegram/ThirdParty/kwayland
 	url = https://github.com/KDE/kwayland.git
+[submodule "Telegram/ThirdParty/dispatch"]
+	path = Telegram/ThirdParty/dispatch
+	url = https://github.com/apple/swift-corelibs-libdispatch
diff --git a/Telegram/ThirdParty/dispatch b/Telegram/ThirdParty/dispatch
new file mode 160000
index 000000000..851fbd3cb
--- /dev/null
+++ b/Telegram/ThirdParty/dispatch
@@ -0,0 +1 @@
+Subproject commit 851fbd3cb89385ba733bc37d6149280996715898
diff --git a/Telegram/build/docker/centos_env/Dockerfile b/Telegram/build/docker/centos_env/Dockerfile
index f28cd1313..7bbc6164b 100644
--- a/Telegram/build/docker/centos_env/Dockerfile
+++ b/Telegram/build/docker/centos_env/Dockerfile
@@ -32,6 +32,9 @@ RUN yum -y install git meson ninja-build autoconf automake libtool patch \
 	devtoolset-10-binutils llvm-toolset-7.0 llvm-toolset-7.0-clang-devel \
 	llvm-toolset-7.0-llvm-devel && yum clean all
 
+# Fix a bug with argument naming in CentOS 7 glibc
+RUN sed -i 's/char \*__block/char */' /usr/include/unistd.h
+
 SHELL [ "bash", "-c", ". /opt/rh/devtoolset-10/enable; exec bash -c \"$@\"", "-s"]
 
 ENV LibrariesPath /usr/src/Libraries
diff --git a/Telegram/lib_crl b/Telegram/lib_crl
index ec103d6bc..3fde21b40 160000
--- a/Telegram/lib_crl
+++ b/Telegram/lib_crl
@@ -1 +1 @@
-Subproject commit ec103d6bccaa59b56537c8658c9e41415bb9ccaf
+Subproject commit 3fde21b40897faf84764597fe1b335ff4c2962ac