diff --git a/.travis.yml b/.travis.yml
index 6488b57..2fa7018 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,8 +9,6 @@ addons:
     - libgmp-dev
     # Selenium
     - xvfb
-    # Backups
-    - zstd
   chrome: stable
 
 cache:
diff --git a/INSTALL.md b/INSTALL.md
index 30069f9..f7fb67e 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -4,7 +4,7 @@ The `state/` directory contains the database. You can download the current datab
 
     $ git clone https://github.com/aelve/guide-database
     $ mv guide-database state
-    $ (cd state; zstd -d *.zst)
+    $ (cd state; gzip -d *.gz)
 
 The `config.json` file contains the config (it will be created at the 1st start). There are 5 settings so far:
 
@@ -111,8 +111,8 @@ Next, create `upload.sh`:
 
 ~~~
 cd /root/guide/state
-rm -f *.zst
-zstd -f *.log
+rm -f *.gz
+gzip -k -f *.log
 git add -A
 GIT_COMMITTER_NAME='auto' GIT_COMMITTER_EMAIL='' git commit --author="auto <>" -m "`date`"
 git push
diff --git a/official.sh b/official.sh
index f311099..9a0c71b 100755
--- a/official.sh
+++ b/official.sh
@@ -3,4 +3,4 @@
 rm -rf state
 git clone --depth 1 https://github.com/aelve/guide-database.git
 mv guide-database state
-(cd state; zstd -d *.zst)
+(cd state; gzip -d *.gz)
diff --git a/scripts/test-official.sh b/scripts/test-official.sh
index 59c30be..2071499 100755
--- a/scripts/test-official.sh
+++ b/scripts/test-official.sh
@@ -9,7 +9,7 @@ fi
 
 git clone --depth 1 https://github.com/aelve/guide-database.git
 mv guide-database state
-(cd state; zstd -d *.zst)
+(cd state; gzip -d *.gz)
 
 cd state
 git branch -v