diff --git a/kernel_tuner/utils/directives.py b/kernel_tuner/utils/directives.py
index d06b0d2c..7d9bb4e7 100644
--- a/kernel_tuner/utils/directives.py
+++ b/kernel_tuner/utils/directives.py
@@ -32,6 +32,9 @@ class Cxx(Language):
     def get(self) -> str:
         return "cxx"
 
+    def end_string(self) -> str:
+        return "#pragma tuner stop"
+
 
 class Fortran(Language):
     """Class to represent Fortran code"""
@@ -39,6 +42,9 @@ class Fortran(Language):
     def get(self) -> str:
         return "fortran"
 
+    def end_string(self) -> str:
+        return "!$tuner stop"
+
 
 class Code(object):
     """Class to represent the directive and host code of the application"""
@@ -356,24 +362,34 @@ def extract_directive_code(code: str, langs: Code, kernel_name: str = None) -> d
     """Extract explicitly marked directive sections from code"""
     if is_cxx(langs.language):
         start_string = "#pragma tuner start"
-        end_string = "#pragma tuner stop"
     elif is_fortran(langs.language):
         start_string = "!$tuner start"
-        end_string = "!$tuner stop"
 
-    return extract_code(start_string, end_string, code, langs, kernel_name)
+    return extract_code(start_string, langs.language.end_string(), code, langs, kernel_name)
 
 
 def extract_initialization_code(code: str, langs: Code) -> str:
     """Extract the initialization section from code"""
     if is_cxx(langs.language):
         start_string = "#pragma tuner initialize"
-        end_string = "#pragma tuner stop"
     elif is_fortran(langs.language):
         start_string = "!$tuner initialize"
-        end_string = "!$tuner stop"
 
-    init_code = extract_code(start_string, end_string, code, langs)
+    init_code = extract_code(start_string, langs.language.end_string(), code, langs)
+    if len(init_code) >= 1:
+        return "\n".join(init_code.values()) + "\n"
+    else:
+        return ""
+
+
+def extract_deinitialization_code(code: str, langs: Code) -> str:
+    """Extract the deinitialization section from code"""
+    if is_cxx(langs.language):
+        start_string = "#pragma tuner deinitialize"
+    elif is_fortran(langs.language):
+        start_string = "!$tuner deinitialize"
+
+    init_code = extract_code(start_string, langs.language.end_string(), code, langs)
     if len(init_code) >= 1:
         return "\n".join(init_code.values()) + "\n"
     else:
@@ -508,6 +524,7 @@ def generate_directive_function(
     langs: Code,
     data: dict = None,
     initialization: str = "",
+    deinitialization: str = "",
     user_dimensions: dict = None,
 ) -> str:
     """Generate tunable function for one directive"""
@@ -535,13 +552,17 @@ def generate_directive_function(
         else:
             code += body
         code = end_timing_cxx(code)
+        if len(deinitialization) > 1:
+            code += deinitialization + "\n"
         code += "\n}"
     elif is_fortran(langs.language):
         body = wrap_timing(body, langs.language)
         if data is not None:
             code += wrap_data(body + "\n", langs, data, preprocessor, user_dimensions)
         else:
-            code += body
+            code += body + "\n"
+        if len(deinitialization) > 1:
+            code += deinitialization + "\n"
         name = signature.split(" ")[1].split("(")[0]
         code += f"\nend function {name}\nend module kt\n"
 
diff --git a/pyproject.toml b/pyproject.toml
index 3175ed34..13d1cb64 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -57,7 +57,7 @@ generate-setup-file = false
 # ATTENTION: if anything is changed here, run `poetry update`
 [tool.poetry.dependencies]
 python = ">=3.9,<3.13"          # NOTE when changing the supported Python versions, also change the test versions in the noxfile
-numpy = ">=1.26.0"              # Python 3.12 requires numpy at least 1.26
+numpy = "^1.26.0"              # Python 3.12 requires numpy at least 1.26
 scipy = ">=1.11.0"
 packaging = "*"                 # required by file_utils
 jsonschema = "*"
diff --git a/test/utils/test_directives.py b/test/utils/test_directives.py
index 3542cdcf..bed2d871 100644
--- a/test/utils/test_directives.py
+++ b/test/utils/test_directives.py
@@ -326,6 +326,13 @@ def test_extract_initialization_code():
     assert extract_initialization_code(code_f90, Code(OpenACC(), Fortran())) == "integer :: value\n"
 
 
+def test_extract_deinitialization_code():
+    code_cpp = "#pragma tuner deinitialize\nconst int value = 42;\n#pragma tuner stop\n"
+    code_f90 = "!$tuner deinitialize\ninteger :: value\n!$tuner stop\n"
+    assert extract_deinitialization_code(code_cpp, Code(OpenACC(), Cxx())) == "const int value = 42;\n"
+    assert extract_deinitialization_code(code_f90, Code(OpenACC(), Fortran())) == "integer :: value\n"
+
+
 def test_add_present_openacc():
     acc_cxx = Code(OpenACC(), Cxx())
     acc_f90 = Code(OpenACC(), Fortran())