diff --git a/csharp/ql/integration-tests/all-platforms/diag_missing_project_files/test.py b/csharp/ql/integration-tests/all-platforms/diag_missing_project_files/test.py
index a2676d16d9c0..fa941f346df1 100644
--- a/csharp/ql/integration-tests/all-platforms/diag_missing_project_files/test.py
+++ b/csharp/ql/integration-tests/all-platforms/diag_missing_project_files/test.py
@@ -1,2 +1,8 @@
+import pytest
+import runs_on
+
+
+# Skipping the test on macos-15, as we're running into trouble.
+@pytest.mark.only_if(not runs_on.macos_15)
 def test(codeql, csharp):
     codeql.database.create(_assert_failure=True)
diff --git a/csharp/ql/integration-tests/posix/standalone_dependencies_no_framework/test.py b/csharp/ql/integration-tests/posix/standalone_dependencies_no_framework/test.py
index 4d5c7b24bc9a..d1c1745d69b6 100644
--- a/csharp/ql/integration-tests/posix/standalone_dependencies_no_framework/test.py
+++ b/csharp/ql/integration-tests/posix/standalone_dependencies_no_framework/test.py
@@ -3,8 +3,11 @@
 import os
 
 
-# Skipping the test on the ARM runners, as we're running into trouble with Mono and nuget.
-@pytest.mark.only_if(runs_on.linux or (runs_on.macos and runs_on.x86_64))
+# Skipping the test on the ARM runners and macos-15, as we're running into trouble with Mono and nuget.
+@pytest.mark.only_if(
+    runs_on.linux
+    or (runs_on.macos and runs_on.x86_64 and not runs_on.macos_15)
+)
 def test(codeql, csharp):
     os.environ["CODEQL_EXTRACTOR_CSHARP_BUILDLESS_DOTNET_FRAMEWORK_REFERENCES"] = (
         "/non-existent-path"
diff --git a/csharp/ql/integration-tests/posix/standalone_dependencies_nuget with_space/test.py b/csharp/ql/integration-tests/posix/standalone_dependencies_nuget with_space/test.py
index 5bfcb3bfd1c5..6d2058c684c2 100644
--- a/csharp/ql/integration-tests/posix/standalone_dependencies_nuget with_space/test.py	
+++ b/csharp/ql/integration-tests/posix/standalone_dependencies_nuget with_space/test.py	
@@ -3,8 +3,11 @@
 import pytest
 
 
-# Skipping the test on the ARM runners, as we're running into trouble with Mono and nuget.
-@pytest.mark.only_if(runs_on.linux or (runs_on.macos and runs_on.x86_64))
+# Skipping the test on the ARM runners and macos-15, as we're running into trouble with Mono and nuget.
+@pytest.mark.only_if(
+    runs_on.linux
+    or (runs_on.macos and runs_on.x86_64 and not runs_on.macos_15)
+)
 def test(codeql, csharp):
     # making sure we're not doing any fallback restore:
     os.environ["CODEQL_EXTRACTOR_CSHARP_BUILDLESS_NUGET_FEEDS_CHECK_FALLBACK_TIMEOUT"] = "1"
diff --git a/csharp/ql/integration-tests/posix/standalone_dependencies_nuget/test.py b/csharp/ql/integration-tests/posix/standalone_dependencies_nuget/test.py
index c7728b64d2af..7f88196097ff 100644
--- a/csharp/ql/integration-tests/posix/standalone_dependencies_nuget/test.py
+++ b/csharp/ql/integration-tests/posix/standalone_dependencies_nuget/test.py
@@ -2,7 +2,10 @@
 import pytest
 
 
-# Skipping the test on the ARM runners, as we're running into trouble with Mono and nuget.
-@pytest.mark.only_if(runs_on.linux or (runs_on.macos and runs_on.x86_64))
+# Skipping the test on the ARM runners and macos-15, as we're running into trouble with Mono and nuget.
+@pytest.mark.only_if(
+    runs_on.linux
+    or (runs_on.macos and runs_on.x86_64 and not runs_on.macos_15)
+)
 def test(codeql, csharp):
     codeql.database.create(build_mode="none")
diff --git a/csharp/ql/integration-tests/posix/standalone_dependencies_nuget_no_sources/test.py b/csharp/ql/integration-tests/posix/standalone_dependencies_nuget_no_sources/test.py
index a6a6123f019c..185fb5201f95 100644
--- a/csharp/ql/integration-tests/posix/standalone_dependencies_nuget_no_sources/test.py
+++ b/csharp/ql/integration-tests/posix/standalone_dependencies_nuget_no_sources/test.py
@@ -3,6 +3,9 @@
 
 
 # Skipping the test on the ARM runners, as we're running into trouble with Mono and nuget.
-@pytest.mark.only_if(runs_on.linux or (runs_on.macos and runs_on.x86_64))
+@pytest.mark.only_if(
+    runs_on.linux
+    or (runs_on.macos and runs_on.x86_64 and not runs_on.macos_15)
+)
 def test(codeql, csharp):
     codeql.database.create(source_root="proj", build_mode="none")