diff --git a/config/config.yaml b/config/config.yml
similarity index 100%
rename from config/config.yaml
rename to config/config.yml
diff --git a/debian/frostfs-s3-gw.install b/debian/frostfs-s3-gw.install
index 7e4b6e1..d87f935 100644
--- a/debian/frostfs-s3-gw.install
+++ b/debian/frostfs-s3-gw.install
@@ -1,4 +1,4 @@
-config/config.yaml etc/frostfs/s3
+config/config.yml etc/frostfs/s3
 config/rules.json var/lib/frostfs/s3
 bin/frostfs-s3-gw usr/bin
 bin/frostfs-s3-authmate usr/bin
diff --git a/debian/frostfs-s3-gw.postinst b/debian/frostfs-s3-gw.postinst
index 117b882..21acee6 100755
--- a/debian/frostfs-s3-gw.postinst
+++ b/debian/frostfs-s3-gw.postinst
@@ -24,9 +24,9 @@ case "$1" in
         id -u frostfs-$USERNAME >/dev/null 2>&1 || useradd -s /usr/sbin/nologin -d /var/lib/frostfs/s3 --system -M -U -c "FrostFS S3 gateway" frostfs-$USERNAME
         if ! dpkg-statoverride --list /etc/frostfs/$USERNAME >/dev/null; then
             chown -f -R root:frostfs-$USERNAME /etc/frostfs/$USERNAME
-            chown -f root:frostfs-$USERNAME /etc/frostfs/$USERNAME/config.yaml || true
+            chown -f root:frostfs-$USERNAME /etc/frostfs/$USERNAME/config.yml || true
             chmod -f 0750 /etc/frostfs/$USERNAME
-            chmod -f 0640 /etc/frostfs/$USERNAME/config.yaml || true
+            chmod -f 0640 /etc/frostfs/$USERNAME/config.yml || true
         fi
         USERDIR=$(getent passwd "frostfs-$USERNAME" | cut -d: -f6)
         if ! dpkg-statoverride --list frostfs-"$USERDIR" >/dev/null; then
diff --git a/debian/frostfs-s3-gw.service b/debian/frostfs-s3-gw.service
index baad2d1..027bb05 100644
--- a/debian/frostfs-s3-gw.service
+++ b/debian/frostfs-s3-gw.service
@@ -4,7 +4,7 @@ Requires=network.target
 
 [Service]
 Type=simple
-ExecStart=/usr/bin/frostfs-s3-gw --config /etc/frostfs/s3/config.yaml
+ExecStart=/usr/bin/frostfs-s3-gw --config /etc/frostfs/s3/config.yml
 User=frostfs-s3
 Group=frostfs-s3
 WorkingDirectory=/var/lib/frostfs/s3
diff --git a/docs/configuration.md b/docs/configuration.md
index 695109c..14bd272 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -101,13 +101,13 @@ Pprof and Prometheus are integrated into the gateway. To enable them, use `--ppr
 
 ## YAML file and environment variables
 
-Example of a YAML configuration file: [yaml-example](/config/config.yaml)
+Example of a YAML configuration file: [yaml-example](/config/config.yml)
 Examples of environment variables: [env-example](/config/config.env).
 
 A path to a configuration file can be specified with `--config` parameter:
 
 ```shell
-$ frostfs-s3-gw --config your-config.yaml
+$ frostfs-s3-gw --config your-config.yml
 ```
 
 ### Multiple configs
@@ -118,13 +118,13 @@ You can either provide several files with repeating `--config` flag or provide p
 Also, you can combine these flags:
 
 ```shell
-$ frostfs-s3-gw --config ./config/config.yaml --config /your/partial/config.yaml --config-dir ./config/dir
+$ frostfs-s3-gw --config ./config/config.yml --config /your/partial/config.yml --config-dir ./config/dir
 ```
 
 **Note:** next file in `--config` flag overwrites values from the previous one.
 Files from `--config-dir` directory overwrite values from `--config` files.
-So the command above run `frostfs-s3-gw` to listen on `0.0.0.0:8080` address (value from `./config/config.yaml`),
-applies parameters from `/your/partial/config.yaml`,
+So the command above run `frostfs-s3-gw` to listen on `0.0.0.0:8080` address (value from `./config/config.yml`),
+applies parameters from `/your/partial/config.yml`,
 enable pprof (value from `./config/dir/pprof.yaml`) and prometheus (value from `./config/dir/prometheus.yaml`).
 
 ### Reload on SIGHUP
@@ -141,7 +141,7 @@ $ kill -s SIGHUP <app_pid>
 Example:
 
 ```shell
-$ ./bin/frostfs-s3-gw --config config.yaml  &> s3.log &
+$ ./bin/frostfs-s3-gw --config config.yml  &> s3.log &
 [1] 998346
 
 $ cat s3.log