diff --git a/docs.it4i/config.yml b/docs.it4i/config.yml
index 12b62dd05870225f1ca7c1119dec97d0a4cfa543..234d18f3d81eb52ee441ae4a300c49300976d28d 100644
--- a/docs.it4i/config.yml
+++ b/docs.it4i/config.yml
@@ -5,7 +5,7 @@ client_user: some_user
 zone: IT4I
 
 authscheme: "pam"
-ssl_ca_cert_file: "/usr/local/etc/irods.it4i.cz.crt"
+ssl_ca_cert_file: "~/chain_geant_ov_rsa_ca_4_full.pem"
 ssl_encryption_key_size: 32
 ssl_encryption_algorithm: "AES-256-CBC"
 ssl_encryption_salt_size: 8
diff --git a/docs.it4i/dice.md b/docs.it4i/dice.md
index caf6da8a4c8499d4dddef6dbcf8fe7d177bdaedf..38a32ab41751ea91badf0de2a062a2f7c1226889 100644
--- a/docs.it4i/dice.md
+++ b/docs.it4i/dice.md
@@ -161,14 +161,14 @@ Enter your current PAM password:
 
 ```console
 cd ~
-sudo wget https://docs.it4i.cz/irods.it4i.cz.crt -P /usr/local/etc/
 wget https://github.com/cyverse/irodsfs/releases/download/v0.7.6/irodsfs_amd64_linux_v0.7.6.tar
 tar -xvf ~/irodsfs_amd64_linux_v0.7.6.tar
-mkdir ~/IRODS ~/.irods
-cd ~/.irods && wget https://docs.it4i.cz/config.yml
+mkdir ~/IRODS ~/.irods/ && cd "$_" && wget https://docs.it4i.cz/config.yml
+sudo wget https://pki.cesnet.cz/_media/certs/chain_geant_ov_rsa_ca_4_full.pem -P ~/.irods/
+sed 's,~,'"$HOME"',g' ~/irods/irods_environment.json
 ```
 
-- edit `~/.irods/config.yml` with username from aai
+- edit `~/.irods/config.yml` with username from [AAI][f]
 
 ***How to mount your collection:***
 
@@ -213,29 +213,31 @@ total 0
 ***steps for Ubuntu20:***
 
 ```console
-Prepare IRODS APT repository
-
-dejan@dejan:~$ LSB_RELEASE="bionic"
-dejan@dejan:~$ wget -qO - https://packages.irods.org/irods-signing-key.asc | sudo apt-key add -
-OK
-dejan@dejan:~$ echo "deb [arch=amd64] https://packages.irods.org/apt/ ${LSB_RELEASE}  main" \
+LSB_RELEASE="bionic"
+wget -qO - https://packages.irods.org/irods-signing-key.asc | sudo apt-key add -
+echo "deb [arch=amd64] https://packages.irods.org/apt/ ${LSB_RELEASE}  main" \
 >   | sudo tee /etc/apt/sources.list.d/renci-irods.list
 deb [arch=amd64] https://packages.irods.org/apt/ bionic  main
-dejan@dejan:~$ sudo apt-get update
-dejan@dejan:~$ apt-cache search irods
-dejan@dejan:~$ wget -c \
+
+sudo apt-get update
+apt-cache search irods
+wget -c \
   http://security.ubuntu.com/ubuntu/pool/main/p/python-urllib3/python-urllib3_1.22-1ubuntu0.18.04.2_all.deb \
   http://security.ubuntu.com/ubuntu/pool/main/r/requests/python-requests_2.18.4-2ubuntu0.1_all.deb \
   http://security.ubuntu.com/ubuntu/pool/main/o/openssl1.0/libssl1.0.0_1.0.2n-1ubuntu5.10_amd64.deb
-dejan@dejan:~$ sudo apt install \
+sudo apt install \
   ./python-urllib3_1.22-1ubuntu0.18.04.2_all.deb \
   ./python-requests_2.18.4-2ubuntu0.1_all.deb \
   ./libssl1.0.0_1.0.2n-1ubuntu5.6_amd64.deb
-dejan@dejan:~$ rm -rf \
+sudo rm -rf \
   ./python-urllib3_1.22-1ubuntu0.18.04.2_all.deb \
   ./python-requests_2.18.4-2ubuntu0.1_all.deb \
   ./libssl1.0.0_1.0.2n-1ubuntu5.6_amd64.deb
-dejan@dejan:~$ sudo apt install -y irods-icommands
+sudo apt install -y irods-icommands
+mkdir ~/.irods/ && cd "$_" && wget https://docs.it4i.cz/irods_environment.json
+sudo wget https://pki.cesnet.cz/_media/certs/chain_geant_ov_rsa_ca_4_full.pem -P ~/.irods
+sed 's,~,'"$HOME"',g' ~/.irods/irods_environment.json
+
 ```
 
 ***Steps for centos***
@@ -246,11 +248,12 @@ sudo wget -qO - https://packages.irods.org/renci-irods.yum.repo | sudo tee /etc/
 sudo yum install epel-release -y
 sudo yum install python-psutil python-jsonschema
 sudo yum install irods-icommands
-sudo wget https://docs.it4i.cz/irods.it4i.cz.crt -P /usr/local/etc/
 mkdir ~/.irods/ && cd "$_" && wget https://docs.it4i.cz/irods_environment.json
+sudo wget https://pki.cesnet.cz/_media/certs/chain_geant_ov_rsa_ca_4_full.pem -P ~/.irods
+sed 's,~,'"$HOME"',g' ~/.irods/irods_environment.json
 ```
 
-- edit ***irods_user_name*** in `~/.irods/irods_environment.json` with username from aai
+- edit ***irods_user_name*** in `~/.irods/irods_environment.json` with username from [AAI][f]
 
 ```console
 [some_user@local_pc ~]$ pwd
diff --git a/docs.it4i/irods.it4i.cz.crt b/docs.it4i/irods.it4i.cz.crt
deleted file mode 100644
index 3e13bc6d62b7e95fa0c442a0cf5ea452b7f612be..0000000000000000000000000000000000000000
--- a/docs.it4i/irods.it4i.cz.crt
+++ /dev/null
@@ -1,122 +0,0 @@
------BEGIN CERTIFICATE-----
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------END CERTIFICATE-----
-
-# subject: C=NL, O=GEANT Vereniging, CN=GEANT OV RSA CA 4
-# issuer:  C=US, ST=New Jersey, L=Jersey City, O=The USERTRUST Network, CN=USERTrust RSA Certification Authority
-# SHA256 Fingerprint: 37:83:4f:a5:ea:40:fb:f7:b6:11:96:95:59:62:e1:ca:05:58:87:24:35:e4:20:66:53:d3:f6:20:dd:8e:98:8e
------BEGIN CERTIFICATE-----
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------END CERTIFICATE-----
-# subject: C=US, ST=New Jersey, L=Jersey City, O=The USERTRUST Network, CN=USERTrust RSA Certification Authority
-# issuer:  C=US, ST=New Jersey, L=Jersey City, O=The USERTRUST Network, CN=USERTrust RSA Certification Authority
-# SHA256 Fingerprint: e7:93:c9:b0:2f:d8:aa:13:e2:1c:31:22:8a:cc:b0:81:19:64:3b:74:9c:89:89:64:b1:74:6d:46:c3:d4:cb:d2
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------END CERTIFICATE-----
diff --git a/docs.it4i/irods1.it4i.cz.crt b/docs.it4i/irods1.it4i.cz.crt
deleted file mode 100644
index 789c181fe524496ea24efc08ccb8b44337745549..0000000000000000000000000000000000000000
--- a/docs.it4i/irods1.it4i.cz.crt
+++ /dev/null
@@ -1,85 +0,0 @@
------BEGIN CERTIFICATE-----
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------END CERTIFICATE-----
-
-# subject: C=NL, O=GEANT Vereniging, CN=GEANT OV RSA CA 4
-# issuer:  C=US, ST=New Jersey, L=Jersey City, O=The USERTRUST Network, CN=USERTrust RSA Certification Authority
-# SHA256 Fingerprint: 37:83:4f:a5:ea:40:fb:f7:b6:11:96:95:59:62:e1:ca:05:58:87:24:35:e4:20:66:53:d3:f6:20:dd:8e:98:8e
------BEGIN CERTIFICATE-----
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------END CERTIFICATE-----
diff --git a/docs.it4i/irods_environment.json b/docs.it4i/irods_environment.json
index ea79cde3ea485211a8de0e0b692430bba6229f23..743d5a26bd5cc6333a378fc1ea1a830b08a973aa 100644
--- a/docs.it4i/irods_environment.json
+++ b/docs.it4i/irods_environment.json
@@ -5,7 +5,7 @@
     "irods_zone_name": "IT4I",
     "irods_authentication_scheme": "pam_password",
     "irods_ssl_verify_server": "cert",
-    "irods_ssl_ca_certificate_file": "/usr/local/etc/irods.it4i.cz.crt",
+    "irods_ssl_ca_certificate_file": "~/chain_geant_ov_rsa_ca_4_full.pem",
     "irods_encryption_algorithm": "AES-256-CBC",
     "irods_encryption_key_size": 32,
     "irods_encryption_num_hash_rounds": 16,