diff --git a/docs/pg-stat-monitor.md b/docs/pg-stat-monitor.md
index ed3727830..320f129e8 100644
--- a/docs/pg-stat-monitor.md
+++ b/docs/pg-stat-monitor.md
@@ -85,7 +85,7 @@ To install `pg_stat_monitor`, run the following command:
 
     The recommended way to modify PostgreSQL configuration file is using the [ALTER SYSTEM](https://www.postgresql.org/docs/13/sql-altersystem.html) command. [Connect to psql](installing.md#connect-to-the-server) and use the following command:
 
-    ```
+    ```sql
     $ ALTER SYSTEM SET shared_preload_libraries = 'pg_stat_monitor';
     ```
 
@@ -106,21 +106,21 @@ To install `pg_stat_monitor`, run the following command:
 
     * On Debian and Ubuntu:
 
-       ```
+       ```sh
        $ sudo systemctl restart postgresql.service
        ```
 
 
     * On Red Hat Enterprise Linux and CentOS:
 
-      ```
+      ```sh
       $ sudo systemctl restart postgresql-13
       ```
 
 
 3. Create the extension. Connect to `psql` and use the following command:
 
-```
+```sql
 $ CREATE EXTENSION pg_stat_monitor;
 ```
 
@@ -140,7 +140,7 @@ $ CREATE EXTENSION pg_stat_monitor;
 
 For example, to view the IP address of the client application that made the query, run the following command:
 
-```
+```sql
 SELECT DISTINCT userid::regrole, pg_stat_monitor.datname, substr(query,0, 50) AS query, calls, bucket, bucket_start_time, queryid, client_ip
 FROM pg_stat_monitor, pg_database
 WHERE pg_database.oid = oid;
@@ -161,7 +161,7 @@ Find more usage examples in [pg_stat_monitor User Guide](https://github.com/perc
 
 Run the following query to list available configuration parameters.
 
-```
+```sql
 $ SELECT name,description FROM pg_stat_monitor_settings;
 ```
 
@@ -190,7 +190,7 @@ You can change a parameter by setting a new value in the configuration file. Som
 
 As an example, let’s set the bucket lifetime from default 60 seconds to 100 seconds. Use the **ALTER SYSTEM** command:
 
-```
+```sql
 $ ALTER SYSTEM set pg_stat_monitor.pgsm_bucket_time = 100;
 ```
 
@@ -199,20 +199,20 @@ Restart the server to apply the change:
 
 * On Debian and Ubuntu
 
-```
+```sh
 $ sudo systemctl restart restart postgresql.service
 ```
 
 
 * On Red Hat Enterprise Linux and CentOS:
 
-```
+```bash
 $ sudo systemctl restart postgresql-13
 ```
 
 Verify the updated parameter:
 
-```
+```sql
 $ SELECT name, value
   FROM pg_stat_monitor_settings
   WHERE name = 'pg_stat_monitor.pgsm_bucket_time';
diff --git a/docs/solutions/backup-recovery.md b/docs/solutions/backup-recovery.md
index 718565b22..72060ca38 100644
--- a/docs/solutions/backup-recovery.md
+++ b/docs/solutions/backup-recovery.md
@@ -41,7 +41,7 @@ A Disaster Recovery (DR) solution ensures that a system can be quickly restored
 
 To achieve a production grade PostgreSQL disaster recovery solution, you need something that can take full or incremental database backups from a running instance, and restore from those backups at any point in time. Percona Distribution for PostgreSQL is supplied with [pgBackRest](#pgbackrest): a reliable, open-source backup and recovery solution for PostgreSQL.
 
-This document focuses on the Disaster recovery solution in Percona Distribution for PostgreSQL. The [Deploying backup and disaster recovery solution in Percona Distribution for PostgreSQL](dr-pg-backrestsetup.md) tutorial provides guidelines of how to set up and test this solution.
+This document focuses on the Disaster recovery solution in Percona Distribution for PostgreSQL. The [Deploying backup and disaster recovery solution in Percona Distribution for PostgreSQL](dr-pgbackrest-setup.md) tutorial provides guidelines of how to set up and test this solution.
 
 ### pgBackRest
 
@@ -61,7 +61,7 @@ Finally, `pgBackRest` also supports restoring PostgreSQL databases to a differen
 
 ## Setup overview
 
-This section describes the architecture of the backup and disaster recovery solution. For the configuration steps, refer to the [Deploying backup and disaster recovery solution in Percona Distribution for PostgreSQL](dr-pg-backrestsetup.md).
+This section describes the architecture of the backup and disaster recovery solution. For the configuration steps, refer to the [Deploying backup and disaster recovery solution in Percona Distribution for PostgreSQL](dr-pgbackrest-setup.md).
 
 ### System architecture
 
diff --git a/requirements.txt b/requirements.txt
index 7b54767ae..1c5f64f6f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 
 Markdown
-mkdocs
+mkdocs == 1.2.3
 mkdocs-versioning
 mkdocs-macros-plugin
 mkdocs-exclude
@@ -12,4 +12,4 @@ mkdocs-material-extensions
 mkdocs-bootstrap-tables-plugin
 mkdocs-section-index
 mkdocs-htmlproofer-plugin
-mike
+mike == 1.1.2