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 d1c1745d69b..e0181a1ec5d 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
@@ -3,10 +3,12 @@ import pytest
 import os
 
 
-# Skipping the test on the ARM runners and macos-15, as we're running into trouble with Mono and nuget.
+# Skipping the test on the ARM runners, macos-15 and macos-26, 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)
+    or (runs_on.macos and runs_on.x86_64
+        and not runs_on.macos_15 and not runs_on.macos_26)
 )
 def test(codeql, csharp):
     os.environ["CODEQL_EXTRACTOR_CSHARP_BUILDLESS_DOTNET_FRAMEWORK_REFERENCES"] = (
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 6d2058c684c..4f3097bb387 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	
@@ -3,10 +3,12 @@ import runs_on
 import pytest
 
 
-# Skipping the test on the ARM runners and macos-15, as we're running into trouble with Mono and nuget.
+# Skipping the test on the ARM runners, macos-15 and macos-26, 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)
+    or (runs_on.macos and runs_on.x86_64
+        and not runs_on.macos_15 and not runs_on.macos_26)
 )
 def test(codeql, csharp):
     # making sure we're not doing any fallback restore:
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 7f88196097f..9a8c9b2291e 100644
--- a/csharp/ql/integration-tests/posix/standalone_dependencies_nuget/test.py
+++ b/csharp/ql/integration-tests/posix/standalone_dependencies_nuget/test.py
@@ -2,10 +2,12 @@ import runs_on
 import pytest
 
 
-# Skipping the test on the ARM runners and macos-15, as we're running into trouble with Mono and nuget.
+# Skipping the test on the ARM runners, macos-15 and macos-26, 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)
+    or (runs_on.macos and runs_on.x86_64
+        and not runs_on.macos_15 and not runs_on.macos_26)
 )
 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 185fb5201f9..f095580d34d 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
@@ -2,10 +2,12 @@ import runs_on
 import pytest
 
 
-# Skipping the test on the ARM runners, as we're running into trouble with Mono and nuget.
+# Skipping the test on the ARM runners, macos-15 and macos-26, 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)
+    or (runs_on.macos and runs_on.x86_64
+        and not runs_on.macos_15 and not runs_on.macos_26)
 )
 def test(codeql, csharp):
     codeql.database.create(source_root="proj", build_mode="none")