diff --git a/.github/valgrind/cppinterop-clang22-valgrind.supp b/.github/valgrind/cppinterop-clang22-valgrind.supp
index cc88b36..2e25864 100644
--- a/.github/valgrind/cppinterop-clang22-valgrind.supp
+++ b/.github/valgrind/cppinterop-clang22-valgrind.supp
@@ -217,3 +217,12 @@
    fun:*TargetLowering*LowerCallTo*
    ...
 }
+{
+   Clang 22 concepts: uninitialised value in Sema::BuildExprRequirement (seen on aarch64)
+   Memcheck:Cond
+   fun:_ZN5clang4Sema20BuildExprRequirementEPNS_4ExprEbNS_14SourceLocationENS_8concepts15ExprRequirement21ReturnTypeRequirementE
+   fun:_ZN5clang13TreeTransformIN12_GLOBAL__N_120TemplateInstantiatorEE21TransformRequiresExprEPNS_12RequiresExprE
+   fun:_ZN12_GLOBAL__N_120TemplateInstantiator21TransformRequiresExprEPN5clang12RequiresExprE
+   fun:_ZN5clang4Sema19SubstConstraintExprEPNS_4ExprERKNS_30MultiLevelTemplateArgumentListE
+   fun:_ZN12_GLOBAL__N_129ConstraintSatisfactionChecker8EvaluateERKN5clang20NormalizedConstraintERKNS1_30MultiLevelTemplateArgumentListE
+}
diff --git a/requirements.txt b/requirements.txt
index dde89e6..7b3c9bf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,11 +1,10 @@
-uv
-
 pytest
 pytest-xdist
 
-# Numba tests (Not tested for Python >= 3.14)
-numba==0.61.2; python_version < '3.14'
+# Numba tests (numba dropped macOS x86_64 wheels after 0.61)
+numba==0.67.0; sys_platform != "darwin" or platform_machine != "x86_64"
+numba==0.61.2; sys_platform == "darwin" and platform_machine == "x86_64" and python_version < "3.14"
 numpy
 
-# Leak check tests (To be re-enabled)
-# psutil
+# Leak check tests
+psutil
diff --git a/test/test_leakcheck.py b/test/test_leakcheck.py
index 39128be..ea21184 100644
--- a/test/test_leakcheck.py
+++ b/test/test_leakcheck.py
@@ -2,6 +2,7 @@
 import sys
 
 from pytest import mark, skip
+from support import IS_MAC
 
 nopsutil = False
 try:
@@ -74,6 +75,9 @@ def check_func(self, scope, func, *args, **kwds):
 
         assert fail < M
 
+    @mark.xfail(
+        condition=IS_MAC, reason="std::string overload fails to resolve on OS X"
+    )
     def test01_free_functions(self):
         """Leak test of free functions"""
 
@@ -99,6 +103,9 @@ def test01_free_functions(self):
         self.check_func(ns, "free_f_ret1")
         self.check_func(ns, "free_f_ret1")
 
+    @mark.xfail(
+        condition=IS_MAC, reason="std::string overload fails to resolve on OS X"
+    )
     def test02_test_static_methods(self):
         """Leak test of static methods"""
 
@@ -125,6 +132,9 @@ class MyClass02 {
             self.check_func(m, "static_method_ol", 42.0, tmpl_args="float")
             self.check_func(m, "static_method_ret")
 
+    @mark.xfail(
+        condition=IS_MAC, reason="std::string overload fails to resolve on OS X"
+    )
     def test03_test_methods(self):
         """Leak test of methods"""
 
diff --git a/test/test_numba.py b/test/test_numba.py
index 646dd2e..ee89390 100644
--- a/test/test_numba.py
+++ b/test/test_numba.py
@@ -18,7 +18,7 @@
 
 class TestREFLEX:
     def setup_class(cls):
-        pass
+        import cppjit.reflex  # noqa: F401
 
     def test01_instance_box_unbox(self):
         """Access to box/unbox methods"""
@@ -95,7 +95,7 @@ class MyData_d1 {
 @mark.skipif(has_numba == False, reason="numba not found")
 class TestNUMBA:
     def setup_class(cls):
-        pass
+        import cppjit.numba_ext  # noqa: F401
 
     def compare(self, go_slow, go_fast, N, *args):
         t0 = time.time()
@@ -759,7 +759,7 @@ def mul_njit(m, x):
 @mark.skipif(has_numba == False, reason="numba not found")
 class TestNUMBA_DOC:
     def setup_class(cls):
-        pass
+        import cppjit.numba_ext  # noqa: F401
 
     def test01_templated_freefunction(self):
         """Numba support documentation example: free templated function"""