diff --git a/linux_cross/Dockerfile b/linux_cross/Dockerfile
index eb53d12..eed5c2a 100644
--- a/linux_cross/Dockerfile
+++ b/linux_cross/Dockerfile
@@ -14,6 +14,9 @@ ENV CUR_GOOGLETEST=v1.13.x
 ENV QT_SELECT=5
 ENV LANG=en_US.utf8
 
+# apply RU mirror
+RUN sed -i 's/deb.debian.org/mirror.mephi.ru/g' /etc/apt/sources.list || true
+RUN sed -i 's/deb.debian.org/mirror.mephi.ru/g' /etc/apt/sources.list.d/* || true
 
 # configs
 COPY .bashrc /root/.bashrc
diff --git a/linux_desktop/Dockerfile b/linux_desktop/Dockerfile
index 0422233..21411f3 100644
--- a/linux_desktop/Dockerfile
+++ b/linux_desktop/Dockerfile
@@ -21,6 +21,9 @@ ENV CUR_GOOGLETEST=v1.13.x
 ENV QT_SELECT=5
 ENV LANG=en_US.utf8
 
+# apply RU mirror
+RUN sed -i 's/deb.debian.org/mirror.mephi.ru/g' /etc/apt/sources.list || true
+RUN sed -i 's/deb.debian.org/mirror.mephi.ru/g' /etc/apt/sources.list.d/* || true
 
 # configs
 COPY .bashrc /root/.bashrc