diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index b9cd972..ac82246 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -25,10 +25,8 @@ jobs:
       matrix:
         gap-branch:
           - master
+          - stable-4.13
           - stable-4.12
-          - stable-4.11
-          - stable-4.10
-          - stable-4.9
 
     steps:
       - uses: actions/checkout@v3
diff --git a/PackageInfo.g b/PackageInfo.g
index 218cd05..634bec8 100644
--- a/PackageInfo.g
+++ b/PackageInfo.g
@@ -74,35 +74,24 @@ PackageDoc := rec(
 ),
 
 Dependencies := rec(
-  GAP := ">= 4.9",
+  GAP := ">= 4.12",
   NeededOtherPackages := [ [ "GAPDoc", ">= 1.5" ] ],
   SuggestedOtherPackages := [ ],
   ExternalConditions := [ ],
 ),
 
-AvailabilityTest := 
+AvailabilityTest :=
   function()
-    local path, file;
-    
-    path:= DirectoriesPackagePrograms( "CddInterface" );
-    
-    file := Filename( path, "CddInterface.so" );
-    
-    if file = fail then
-      
-      LogPackageLoadingMessage( PACKAGE_WARNING,
-          [
-            "The library `libcdd' is not yet installed on the system,",
-            " or it is not correctly compiled!,",
-            "Please, see the installation instructions in README.md."
-          ] );
-      
+    if not IsKernelExtensionAvailable("CddInterface") then
+      LogPackageLoadingMessage(PACKAGE_WARNING, [
+        "The library `libcdd' is not yet installed on the system,",
+        " or it is not correctly compiled!,",
+        "Please, see the installation instructions in README.md."
+      ]);
       return fail;
-    
     fi;
-    
+
     return true;
-      
 end,
 
 TestFile := "tst/testall.g",
diff --git a/init.g b/init.g
index eece57e..6cca5da 100644
--- a/init.g
+++ b/init.g
@@ -3,11 +3,10 @@
 #
 # Reading the declaration part of the package.
 #
-_PATH_SO:=Filename(DirectoriesPackagePrograms("CddInterface"), "CddInterface.so");
-if _PATH_SO <> fail then
-    LoadDynamicModule(_PATH_SO);
+
+if not LoadKernelExtension("CddInterface") then
+    Error("failed to load the CddInterface package kernel extension");
 fi;
-Unbind(_PATH_SO);
 
 ReadPackage( "CddInterface", "gap/polyhedra.gd");
 ReadPackage( "CddInterface", "gap/tools.gd");