diff --git a/.ruby-version b/.ruby-version
index 6d5369b9..f13c6f45 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-ruby-3.3.4
+ruby-3.3.5
diff --git a/.tool-versions b/.tool-versions
index 05668b72..1dd19980 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1 +1 @@
-ruby 3.3.4
+ruby 3.3.5
diff --git a/DEVELOPMENT.md b/DEVELOPMENT.md
index e135780f..0b2c75a6 100644
--- a/DEVELOPMENT.md
+++ b/DEVELOPMENT.md
@@ -10,12 +10,14 @@
 In case you are using an Apple M1 Chip you might run into trouble building
 Ruby. A work around for that is using the command
 
-    rvm reinstall 3.3.4 --with-openssl-dir=$(brew --prefix openssl) --with-readline-dir=$(brew --prefix readline) --with-libyaml-dir=$(brew --prefix libyaml) --disable-dtrace --disable-docs
+    cd hdm
+    rvm reinstall $(cat .ruby-version) --with-openssl-dir=$(brew --prefix openssl) --with-readline-dir=$(brew --prefix readline) --with-libyaml-dir=$(brew --prefix libyaml) --disable-dtrace --disable-docs
 
 On intel you can proceed with the following:
 
-    rvm install 3.3.4
-    rvm use 3.3.4
+    cd hdm
+    rvm install $(cat .ruby-version)
+    rvm use $(cat .ruby-version)
 
 ## **Main part**
 
diff --git a/Dockerfile b/Dockerfile
index 61d28299..1f0a19bc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.3.4-slim-bookworm
+FROM ruby:3.3.5-slim-bookworm
 
 RUN apt update && apt install -y \
       g++ \
diff --git a/MANUAL_INSTALL.md b/MANUAL_INSTALL.md
index ac6ee4ea..e3464c54 100644
--- a/MANUAL_INSTALL.md
+++ b/MANUAL_INSTALL.md
@@ -27,8 +27,9 @@ On Alma 8 you must install libyaml-devel:
 
 Now you can install the required ruby version:
 
-    rvm install 3.3.4
-    rvm use 3.3.4
+    cd hdm
+    rvm install $(cat .ruby-version)
+    rvm use $(cat .ruby-version)
 
 ### **Main part**