diff --git a/meson.build b/meson.build
index d530b96..af0d62e 100644
--- a/meson.build
+++ b/meson.build
@@ -16,18 +16,19 @@ endif
 qblas_dep = dependency('qblas', fallback: ['qblas', 'qblas_dep'])
 
 # Try to find SLEEF system-wide first, fall back to subproject if not found
-sleef_dep = dependency('sleef', fallback: ['sleef', 'sleef_dep'], required: false)
+# Required SLEEF version (must match sleef.wrap revision)
+required_sleef_version = '3.9.0'
+sleef_dep = dependency('sleef', version: '>=' + required_sleef_version, fallback: ['sleef', 'sleef_dep'], required: false)
 
 use_system_sleef = false
 fallback_reason = ''
 
-if sleef_dep.found() and sleef_dep.type_name() != 'internal'
+if sleef_dep.found() and sleef_dep.type_name() != 'internal' and sleef_dep.version().startswith(required_sleef_version)
   # SLEEF found system-wide - verify quad-precision support
   cpp = meson.get_compiler('cpp')
   sleefquad_lib = cpp.find_library('sleefquad', required: false)
-  tlfloat_lib = cpp.find_library('tlfloat', required: false)
   
-  if sleefquad_lib.found() and tlfloat_lib.found()
+  if sleefquad_lib.found()
     sleefquad_test_code = '''
     #include <sleefquad.h>
 
@@ -41,7 +42,7 @@ if sleef_dep.found() and sleef_dep.type_name() != 'internal'
     # this should compile and link
     quad_works = cpp.links(
       sleefquad_test_code,
-      dependencies: [sleef_dep, sleefquad_lib, tlfloat_lib],
+      dependencies: [sleef_dep, sleefquad_lib],
       name: 'SLEEF quad-precision support'
     )
     
@@ -49,18 +50,19 @@ if sleef_dep.found() and sleef_dep.type_name() != 'internal'
       sleefquad_dep = declare_dependency(
         dependencies: [sleef_dep, sleefquad_lib]
       )
-      tlfloat_dep = declare_dependency(
-        dependencies: [tlfloat_lib]
-      )
       use_system_sleef = true
     else
       fallback_reason = 'System-wide SLEEF installation found but a test for quad precision support failed.'
     endif
   else
-    fallback_reason = 'System-wide SLEEF installation does not have a sleefquad library.'
+    fallback_reason = 'System-wide SLEEF installation does not have the sleefquad library.'
   endif
 else
-  fallback_reason = 'Cannot find system-wide SLEEF installation.'
+  if sleef_dep.found() and sleef_dep.type_name() != 'internal'
+    fallback_reason = 'System SLEEF version @0@ does not match required version @1@'.format(sleef_dep.version(), required_sleef_version)
+  else
+    fallback_reason = 'Cannot find system-wide SLEEF installation.'
+  endif
 endif
 
 if use_system_sleef
@@ -69,7 +71,6 @@ else
   sleef_subproj = subproject('sleef')
   sleef_dep = sleef_subproj.get_variable('sleef_dep')
   sleefquad_dep = sleef_subproj.get_variable('sleefquad_dep')
-  tlfloat_dep = sleef_subproj.get_variable('tlfloat_dep')
   warning(fallback_reason)
   message('Proceeding with vendored SLEEF subproject instead')
 endif
@@ -93,7 +94,7 @@ message('Using NumPy version: @0@'.format(numpy_version))
 npymath_path = incdir_numpy / '..' / 'lib'
 npymath_lib = c.find_library('npymath', dirs: npymath_path)
 
-dependencies = [py_dep, qblas_dep, sleef_dep, sleefquad_dep, tlfloat_dep, npymath_lib]
+dependencies = [py_dep, qblas_dep, sleef_dep, sleefquad_dep, npymath_lib]
 
 # Add OpenMP dependency (optional, for threading)
 openmp_dep = dependency('openmp', required: false, static: false)
diff --git a/pyproject.toml b/pyproject.toml
index 5da7884..462ab02 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,7 @@ classifiers = [
 ]
 requires-python = ">=3.11.0"
 dependencies = [
-    "numpy>=2.0"
+    "numpy>=2.4"
 ]
 
 [project.optional-dependencies]
diff --git a/subprojects/packagefiles/sleef/meson.build b/subprojects/packagefiles/sleef/meson.build
index 4e3713d..524a550 100644
--- a/subprojects/packagefiles/sleef/meson.build
+++ b/subprojects/packagefiles/sleef/meson.build
@@ -32,6 +32,7 @@ sleef_configure = run_command([
     '-DSLEEF_BUILD_SHARED_LIBS=OFF',
     '-DSLEEF_BUILD_TESTS=OFF',
     '-DSLEEF_BUILD_INLINE_HEADERS=OFF',
+    '-DSLEEF_ENABLE_TLFLOAT=OFF', # this is only used for testing in SLEEF, not runtime
     '-DCMAKE_POSITION_INDEPENDENT_CODE=ON',
     '-DCMAKE_INSTALL_PREFIX=' + meson.current_build_dir() / sleef_install_dir
 ] + sleef_simd_flags, check: false, capture: true)
@@ -72,10 +73,4 @@ sleefquad_dep = declare_dependency(
     dependencies: [sleef_build_dep, sleef_dep],
     compile_args: compile_args_list,
     link_args: ['-L' + meson.current_build_dir() / sleef_install_dir / 'lib', '-L' + meson.current_build_dir() / sleef_install_dir / 'lib64', '-lsleefquad']
-)
-
-tlfloat_dep = declare_dependency(
-    dependencies: [sleef_build_dep],
-    compile_args: compile_args_list,
-    link_args: ['-L' + meson.current_build_dir() / sleef_install_dir / 'lib', '-L' + meson.current_build_dir() / sleef_install_dir / 'lib64', '-ltlfloat']
 )
\ No newline at end of file
diff --git a/subprojects/sleef.wrap b/subprojects/sleef.wrap
index bac3126..920f61e 100644
--- a/subprojects/sleef.wrap
+++ b/subprojects/sleef.wrap
@@ -1,7 +1,7 @@
 [wrap-git]
 directory=sleef
 url=https://github.com/shibatch/sleef.git
-revision=43a0252ba9331adc7fb10755021f802863678c38
+revision=3.9.0
 patch_directory=sleef
 
 [provide]