diff --git a/DEVELOPMENT.md b/DEVELOPMENT.md
index 602791d8e..aaacd4e52 100644
--- a/DEVELOPMENT.md
+++ b/DEVELOPMENT.md
@@ -2,7 +2,7 @@
 
 ## Requirements
 
-You need git, bash, docker, docker-compose, make and go installed.
+You need git, bash, docker, docker-compose, make and openssl installed.
 
 Go is needed to install https://github.com/FiloSottile/mkcert. The development setup uses HTTPS per default. OpenSlides does not work with HTTP anymore since features are required (like http2) that only works in a secure environment.
 
@@ -15,13 +15,9 @@ Clone this repository:
 
 TODO: use `--recurse-submodules`, when master is OS4
 
-After checking out the os4-branch you need to initialize all submodules and install a root-cert:
+After checking out the os4-branch you need to initialize all submodules:
 
     $ git submodule update --init
-    $ go get https://github.com/FiloSottile/mkcert
-    $ sudo mkcert -install
-
-If you get an error, you might need to install `certutil`. For Debian: `sudo apt install libnss3-tools`.
 
 Finally, start the dev server:
 
diff --git a/haproxy/prepare-cert.sh b/haproxy/prepare-cert.sh
index 118090482..d3f76d8ec 100755
--- a/haproxy/prepare-cert.sh
+++ b/haproxy/prepare-cert.sh
@@ -9,10 +9,8 @@ combined="src/combined.pem"
 if [[ ! -f $combined ]]; then
     echo "Creating certificates..."
     cd src
-    if type 2>1 >/dev/null mkcert ; then
-      mkcert -cert-file localhost.pem -key-file localhost-key.pem localhost 127.0.0.1
-    elif type 2>1 >/dev/null openssl ; then
-      echo "Command 'mkcert' not found, using openssl fallback."
+    if type 2>&1 >/dev/null openssl ; then
+      echo "Using openssl to generate a certificate."
       echo "You will need to accept an security exception for the"
       echo "generated certificate in your browser manually."
       openssl req -x509 -newkey rsa:4096 -nodes -days 3650 \
diff --git a/openslides-autoupdate-service b/openslides-autoupdate-service
index ce94d1321..b7a27628c 160000
--- a/openslides-autoupdate-service
+++ b/openslides-autoupdate-service
@@ -1 +1 @@
-Subproject commit ce94d13217edc72f7d53e94fb93864d183cb53d3
+Subproject commit b7a27628c198db1165a1ebf832b508cc3eb08dd7
diff --git a/openslides-backend b/openslides-backend
index d2398df88..b1fbe0ffe 160000
--- a/openslides-backend
+++ b/openslides-backend
@@ -1 +1 @@
-Subproject commit d2398df883394140d7e2b1df88a203d58fa00da4
+Subproject commit b1fbe0ffe665bfb609baa4b2ca5d04d3ed6ba241
diff --git a/openslides-client b/openslides-client
index 197d55208..626b43dfd 160000
--- a/openslides-client
+++ b/openslides-client
@@ -1 +1 @@
-Subproject commit 197d552083287d418387556b99a755fa81abb29a
+Subproject commit 626b43dfd0adf6c1c958a37e63c9de745b360a0e