diff --git a/.github/workflows/moodle-ci.yml b/.github/workflows/moodle-ci.yml
index 75312bb..b86b367 100644
--- a/.github/workflows/moodle-ci.yml
+++ b/.github/workflows/moodle-ci.yml
@@ -11,8 +11,42 @@ on:
       - '**'
 
 jobs:
+  define-matrix:
+    runs-on: ubuntu-latest
+
+    outputs:
+      include_list: ${{ steps.include_list.outputs.include_list }}
+
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+
+      - name: Define matrix
+        id: include_list
+        run: |
+          # Generates a json array with include entries for all possible combinations of PHP, Moodle branch and database
+          include_str="["
+          first_entry=true
+          for i in $(cat plugin_compatibility.json | jq -c '.[]'); do
+            moodle=$(echo "$i" | jq -r '.moodle')
+            for php in $(echo "$i" | jq -r '.PHP[]'); do
+              for database in pgsql mariadb; do
+                if [ "$first_entry" = true ]; then
+                  first_entry=false
+                else
+                  include_str="$include_str,"
+                fi
+                next_entry="{\"php\": \"$php\", \"moodle-branch\": \"$moodle\", \"database\": \"$database\", \"experimental\": false}"
+                include_str="$include_str$next_entry"
+              done
+            done
+          done
+          include_str="$include_str]"
+          echo "include_list=$include_str" >> "$GITHUB_OUTPUT"
+
   test:
     runs-on: ubuntu-22.04
+    needs: define-matrix
 
     services:
       postgres:
@@ -38,15 +72,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: ['8.1', '8.2', '8.3']
-        moodle-branch: ['MOODLE_404_STABLE', 'MOODLE_405_STABLE']
+        php: ['8.3']
+        moodle-branch: ['main']
         database: [pgsql, mariadb]
-        experimental: [false]
-        include:
-          - php: '8.3'
-            moodle-branch: 'main'
-            database: mariadb
-            experimental: true
+        experimental: [true]
+        include: ${{ fromJSON(needs.define-matrix.outputs.include_list) }}
 
     continue-on-error: ${{ matrix.experimental }}
 
diff --git a/README.md b/README.md
index 4447447..e0fcf86 100644
--- a/README.md
+++ b/README.md
@@ -17,14 +17,7 @@
 ## Kompabilität
 Folgende Versionen werden unterstützt (mit mariadb und postresql getestet):
 
-| Moodle Branch           | PHP Version |
-|-------------------------|-------------|
-| MOODLE_404_STABLE       | 8.1         |
-| MOODLE_404_STABLE       | 8.2         |
-| MOODLE_404_STABLE       | 8.3         |
-| MOODLE_405_STABLE (LTS) | 8.1         |
-| MOODLE_405_STABLE (LTS) | 8.2         |
-| MOODLE_405_STABLE (LTS) | 8.3         |
+siehe [plugin_compatibility.json](plugin_compatibility.json)
 
 
 
diff --git a/plugin_compatibility.json b/plugin_compatibility.json
new file mode 100644
index 0000000..5510194
--- /dev/null
+++ b/plugin_compatibility.json
@@ -0,0 +1,10 @@
+[
+  {
+    "moodle": "MOODLE_404_STABLE",
+    "PHP": ["8.1", "8.2", "8.3"]
+  },
+  {
+    "moodle": "MOODLE_405_STABLE",
+    "PHP": ["8.1", "8.2", "8.3"]
+  }
+]
\ No newline at end of file