diff --git a/.github/workflows/root-ci-config/buildconfig/debiantesting.txt b/.github/workflows/root-ci-config/buildconfig/debiantesting.txt
new file mode 100644
index 0000000000000..896845d08f734
--- /dev/null
+++ b/.github/workflows/root-ci-config/buildconfig/debiantesting.txt
@@ -0,0 +1,4 @@
+CMAKE_CXX_STANDARD=23
+builtin_llvm=OFF
+builtin_mathtext=OFF
+test_distrdf_pyspark=OFF
diff --git a/.github/workflows/root-ci.yml b/.github/workflows/root-ci.yml
index 0af636192a117..e192c6b5eae9e 100644
--- a/.github/workflows/root-ci.yml
+++ b/.github/workflows/root-ci.yml
@@ -414,6 +414,7 @@ jobs:
           - image: ubuntu2610
           - image: debian13
             overrides: ["dev=ON", "CMAKE_CXX_FLAGS=-Wsuggest-override"]
+          - image: debiantesting
           # Special builds
           - image: alma9
             platform_config: alma9-modules_off
diff --git a/roottest/root/meta/genreflex/TClass/TClassUtils.h b/roottest/root/meta/genreflex/TClass/TClassUtils.h
index a0571313a8912..1d05f802cc2a0 100644
--- a/roottest/root/meta/genreflex/TClass/TClassUtils.h
+++ b/roottest/root/meta/genreflex/TClass/TClassUtils.h
@@ -51,10 +51,11 @@ void printMemberNames(const std::string& className, const std::string indent="",
          std::cout << std::endl;
       if (mbProp.count(dmName)!=0){
          TDictAttributeMap* attrMap = dm->GetAttributeMap();
-         for (propertiesNames::iterator prop=mbProp[dmName].begin();
-              prop!=mbProp[dmName].end();prop++){
-            const char* propVals = attrMap->GetPropertyAsString(prop->c_str());
-            std::cout << "    - " << *prop << ": " << propVals <<  std::endl;            
+         propertiesNames &props = mbProp[dmName];
+         for (size_t i = 0; i < props.size(); ++i) {
+            const std::string &prop = props[i];
+            const char* propVals = attrMap->GetPropertyAsString(prop.c_str());
+            std::cout << "    - " << prop << ": " << propVals << std::endl;            
          }
       }
    }
diff --git a/roottest/root/tree/selectorreader/runClasses.C b/roottest/root/tree/selectorreader/runClasses.C
index 912dc429736fc..741c1e58e4b7f 100644
--- a/roottest/root/tree/selectorreader/runClasses.C
+++ b/roottest/root/tree/selectorreader/runClasses.C
@@ -124,8 +124,8 @@ void runClasses(const std::string &srcdir = ".") {
                                      "TreeEventTreeSimple2",
                                      "TreeDuplicateName"
                                      };
-   for (std::string const &treeName : trees)
-   {
+   for (size_t i = 0; i < trees.size(); ++i) {
+      std::string const &treeName = trees[i];
       fprintf(stderr, "Testing tree %s\n", treeName.c_str());
 
       TFile f((srcdir + "/trees/" + treeName + ".root").c_str()); // Load file
diff --git a/roottest/root/tree/selectorreader/runCollections.C b/roottest/root/tree/selectorreader/runCollections.C
index bbe96c09a727c..21956ecc60600 100644
--- a/roottest/root/tree/selectorreader/runCollections.C
+++ b/roottest/root/tree/selectorreader/runCollections.C
@@ -166,8 +166,8 @@ void runCollections(const std::string &srcdir = ".")
                                      //"TreeTClonesArray0", // Known failure
                                      "TreeTClonesArray2"
                                      };
-   for (std::string const &treeName : trees)
-   {
+   for (size_t i = 0; i < trees.size(); ++i) {
+      std::string const &treeName = trees[i];
       fprintf(stderr, "Testing tree %s\n", treeName.c_str());
 
       TFile f((srcdir + "/trees/" + treeName + ".root").c_str()); // Load file