diff --git a/Dockerfile.jenkins b/Dockerfile.jenkins
new file mode 100644
index 0000000..13eea5f
--- /dev/null
+++ b/Dockerfile.jenkins
@@ -0,0 +1,3 @@
+FROM debian:bookworm-slim
+RUN apt update && apt install -y docker.io make bash
+
diff --git a/Jenkinsfile b/Jenkinsfile
index f905b7e..d9bdd8f 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -1,5 +1,12 @@
 pipeline {
-    agent any
+    agent {
+        dockerfile {
+            filename 'Dockerfile.jenkins'
+            dir '.'
+            label 'r7rs-pffi-jenkins'
+            args '--privileged'
+        }
+    }
 
     options {
             buildDiscarder(logRotator(numToKeepStr: '10', artifactNumToKeepStr: '10'))
diff --git a/README.md b/README.md
index 034d296..a4b3b95 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,15 @@ Support is defined in tiers, each tier has short explanation about it after the
 Currently the interface of the library is okay. Now work needs to be done to make tests and see
 that each implementation passes those tests. This will be done in tiered order starting from tier 1.
 
+Untiered, support needs to be investigated:
+
+- [Gerbil](https://cons.io/)
+- [Ypsilon](http://www.littlewingpinball.com/doc/en/ypsilon/)
+- [Larceny](https://larcenists.org/)
+- [Mosh](https://mosh.monaos.org)
+- [Skint](https://github.com/false-schemers/skint)
+- [s7](https://scheme.fail://ccrma.stanford.edu/software/snd/snd/s7.html)
+
 ## Tier 1
 
 Aiming to support these first
@@ -75,17 +84,6 @@ In queue
 
 ## Tier 4
 
-Support needs to be investigated.
-
-- [Gerbil](https://cons.io/)
-- [Ypsilon](http://www.littlewingpinball.com/doc/en/ypsilon/)
-- [Larceny](https://larcenists.org/)
-- [Mosh](https://mosh.monaos.org)
-- [Skint](https://github.com/false-schemers/skint)
-- [s7](https://scheme.fail://ccrma.stanford.edu/software/snd/snd/s7.html)
-
-## Tier 5
-
 Support needs investigation and serious design or making dynamic FFI for the implementation
 
 - [Chibi](https://synthcode.com/scheme/chibi)
@@ -97,7 +95,7 @@ Support needs investigation and serious design or making dynamic FFI for the imp
 - [Gauche](https://practical-scheme.net/gauche/)
     - FFI requires C code
 
-## Tier 6
+## Tier 5
 
 Support maybe possible/dreaming about.
 
@@ -106,9 +104,9 @@ Support maybe possible/dreaming about.
   - Gambit compiles to different targets other than C too, for example Javascript. It would be cool
   and interesting to see if this FFI could also support some of those
 
-## Tier 7
+## Tier 6
 
-Other
+Other.
 
 - [Loko](https://scheme.fail/)
     - Desires no C interop, I can respect that