diff --git a/recipes/libtommath/all/conandata.yml b/recipes/libtommath/all/conandata.yml
index ecbf1c3cd0078..cdc64416010c8 100644
--- a/recipes/libtommath/all/conandata.yml
+++ b/recipes/libtommath/all/conandata.yml
@@ -1,8 +1,18 @@
 sources:
+  "1.3.0":
+    url: "https://github.com/libtom/libtommath/releases/download/v1.3.0/ltm-1.3.0.tar.xz"
+    sha256: "296272d93435991308eb73607600c034b558807a07e829e751142e65ccfa9d08"
+  "1.2.1":
+    source:
+      url: "https://github.com/libtom/libtommath/releases/download/v1.2.1/ltm-1.2.1.tar.xz"
+      sha256: "986025d7b374276fee2e30e99f3649e4ac0db8a02257a37ee10eae72abed0d1f"
+    cmakelists:
+      url: "https://raw.githubusercontent.com/libtom/libtommath/8314bde5e5c8e5d9331460130a9d1066e324f091/CMakeLists.txt"
+      sha256: "68f22dbed8d1fabab8819a7a482d1a74d0b1813b8527333fb767afcfc21c421f"
   "1.2.0":
-    url: "https://github.com/libtom/libtommath/releases/download/v1.2.0/ltm-1.2.0.tar.xz"
-    sha256: "b7c75eecf680219484055fcedd686064409254ae44bc31a96c5032843c0e18b1"
-patches:
-  "1.2.0":
-    - patch_file: "patches/0001-enable-building-dll-s-using-makefile-msvc.patch"
-      base_path: "source_subfolder"
+    source:
+      url: "https://github.com/libtom/libtommath/releases/download/v1.2.0/ltm-1.2.0.tar.xz"
+      sha256: "b7c75eecf680219484055fcedd686064409254ae44bc31a96c5032843c0e18b1"
+    cmakelists:
+      url: "https://raw.githubusercontent.com/libtom/libtommath/8314bde5e5c8e5d9331460130a9d1066e324f091/CMakeLists.txt"
+      sha256: "68f22dbed8d1fabab8819a7a482d1a74d0b1813b8527333fb767afcfc21c421f"
diff --git a/recipes/libtommath/all/conanfile.py b/recipes/libtommath/all/conanfile.py
index 6bdf6dd129d98..f9ebd1474071a 100644
--- a/recipes/libtommath/all/conanfile.py
+++ b/recipes/libtommath/all/conanfile.py
@@ -1,16 +1,23 @@
-from conans import AutoToolsBuildEnvironment, ConanFile, tools
 import os
 
-required_conan_version = ">=1.33.0"
+from conan import ConanFile
+from conan.tools.cmake import CMake, CMakeToolchain, cmake_layout
+from conan.tools.files import copy, get, rm, rmdir, download, replace_in_file, save
+from conan.tools.microsoft import is_msvc
+from conan.tools.scm import Version
+
+required_conan_version = ">=1.53.0"
 
 
 class LibTomMathConan(ConanFile):
     name = "libtommath"
     description = "LibTomMath is a free open source portable number theoretic multiple-precision integer library written entirely in C."
-    topics = "libtommath", "math", "multiple", "precision"
     license = "Unlicense"
-    homepage = "https://www.libtom.net/"
     url = "https://github.com/conan-io/conan-center-index"
+    homepage = "https://www.libtom.net/"
+    topics = ("math", "multi-precision")
+
+    package_type = "library"
     settings = "os", "arch", "compiler", "build_type"
     options = {
         "shared": [True, False],
@@ -21,119 +28,76 @@ class LibTomMathConan(ConanFile):
         "fPIC": True,
     }
 
-    exports_sources = "patches/*"
-
-    @property
-    def _source_subfolder(self):
-        return "source_subfolder"
-
-    @property
-    def _settings_build(self):
-        return getattr(self, "settings_build", self.settings)
-
     def config_options(self):
         if self.settings.os == "Windows":
             del self.options.fPIC
 
     def configure(self):
         if self.options.shared:
-            del self.options.fPIC
-        del self.settings.compiler.libcxx
-        del self.settings.compiler.cppstd
+            self.options.rm_safe("fPIC")
+        self.settings.rm_safe("compiler.libcxx")
+        self.settings.rm_safe("compiler.cppstd")
 
-    def build_requirements(self):
-        if self._settings_build.os == "Windows" and self.settings.compiler != "Visual Studio":
-            self.build_requires("make/4.3")
-        if self.settings.compiler != "Visual Studio" and self.settings.os != "Windows" and self.options.shared:
-            self.build_requires("libtool/2.4.6")
+    def layout(self):
+        cmake_layout(self, src_folder="src")
 
     def source(self):
-        tools.get(**self.conan_data["sources"][self.version],
-                  destination=self._source_subfolder, strip_root=True)
-
-    def _run_makefile(self, target=None):
-        target = target or ""
-        autotools = AutoToolsBuildEnvironment(self)
-        autotools.libs = []
-        if self.settings.os == "Windows" and self.settings.compiler != "Visual Studio":
-            autotools.link_flags.append("-lcrypt32")
-        if self.settings.os == "Macos" and self.settings.arch == "armv8":
-            # FIXME: should be handled by helper
-            autotools.link_flags.append("-arch arm64")
-        args = autotools.vars
-        args.update({
-            "PREFIX": self.package_folder,
-        })
-        if self.settings.compiler != "Visual Studio":
-            if tools.get_env("CC"):
-                args["CC"] = tools.get_env("CC")
-            if tools.get_env("LD"):
-                args["LD"] = tools.get_env("LD")
-            if tools.get_env("AR"):
-                args["AR"] = tools.get_env("AR")
-
-            args["LIBTOOL"] = "libtool"
-        arg_str = " ".join("{}=\"{}\"".format(k, v) for k, v in args.items())
-
-        with tools.environment_append(args):
-            with tools.chdir(self._source_subfolder):
-                if self.settings.compiler == "Visual Studio":
-                    if self.options.shared:
-                        target = "tommath.dll"
-                    else:
-                        target = "tommath.lib"
-                    with tools.vcvars(self):
-                        self.run("nmake -f makefile.msvc {} {}".format(
-                            target,
-                            arg_str,
-                        ), run_environment=True)
-                else:
-                    if self.settings.os == "Windows":
-                        makefile = "makefile.mingw"
-                        if self.options.shared:
-                            target = "libtommath.dll"
-                        else:
-                            target = "libtommath.a"
-                    else:
-                        if self.options.shared:
-                            makefile = "makefile.shared"
-                        else:
-                            makefile = "makefile.unix"
-                    self.run("{} -f {} {} {} -j{}".format(
-                        tools.get_env("CONAN_MAKE_PROGRAM", "make"),
-                        makefile,
-                        target,
-                        arg_str,
-                        tools.cpu_count(),
-                    ), run_environment=True)
+        if Version(self.version) >= "1.3":
+            get(self, **self.conan_data["sources"][self.version], strip_root=True)
+        else:
+            get(self, **self.conan_data["sources"][self.version]["source"], strip_root=True)
+            download(self, **self.conan_data["sources"][self.version]["cmakelists"], filename="CMakeLists.txt")
+
+    def generate(self):
+        tc = CMakeToolchain(self)
+        tc.variables["CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS"] = True
+        tc.cache_variables["CMAKE_POLICY_DEFAULT_CMP0077"] = "NEW"
+        tc.generate()
+
+    def _patch_sources(self):
+        if Version(self.version) < "1.3":
+            save(self, os.path.join(self.source_folder, "sources.cmake"),
+                 "file(GLOB SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/*.c)\n"
+                 "file(GLOB HEADERS ${CMAKE_CURRENT_SOURCE_DIR}/*.h)\n")
+            # Disable installation of docs, which is not valid for < 1.3
+            replace_in_file(self, os.path.join(self.source_folder, "CMakeLists.txt"),
+                            "# Windows uses a different help sytem.\nif(", "if(0 AND")
+        if is_msvc(self):
+            # libtommath requires /O1 on MSVC Debug builds for dead code elimination.
+            # I could not find a way short of forcing settings.build_type=RelWithDebInfo to get that to work, though.
+            # Disabling the missing symbols directly instead.
+            # https://github.com/libtom/libtommath/blob/42b3fb07e7d504f61a04c7fca12e996d76a25251/s_mp_rand_platform.c#L120-L138
+            file = "bn_s_mp_rand_platform.c" if Version(self.version) <= "1.3.0" else "s_mp_rand_platform.c"
+            for symbol in ["s_read_getrandom", "s_read_ltm_rng", "s_read_arc4random", "s_read_urandom"]:
+                replace_in_file(self, os.path.join(self.source_folder, file),
+                                f"if ((err != MP_OKAY) && MP_HAS({symbol.upper()})",
+                                f"// if ((err != MP_OKAY) && MP_HAS({symbol.upper()})")
 
     def build(self):
-        for patch in self.conan_data.get("patches", {}).get(self.version, []):
-            tools.patch(**patch)
-        self._run_makefile()
+        self._patch_sources()
+        cmake = CMake(self)
+        cmake.configure()
+        cmake.build()
 
     def package(self):
-        self.copy("LICENSE", src=self._source_subfolder, dst="licenses")
-        if self.settings.os == "Windows":
-            # The mingw makefile uses `cmd`, which is only available on Windows
-            self.copy("*.a", src=self._source_subfolder, dst="lib")
-            self.copy("*.lib", src=self._source_subfolder, dst="lib")
-            self.copy("*.dll", src=self._source_subfolder, dst="bin")
-            self.copy("tommath.h", src=self._source_subfolder, dst="include")
-        else:
-            self._run_makefile("install")
+        copy(self, "LICENSE", self.source_folder, os.path.join(self.package_folder, "licenses"))
+        cmake = CMake(self)
+        cmake.install()
 
-        tools.remove_files_by_mask(os.path.join(self.package_folder, "lib"), "*.la")
-        tools.rmdir(os.path.join(self.package_folder, "lib", "pkgconfig"))
-
-        if self.settings.compiler == "Visual Studio" and self.options.shared:
-            os.rename(os.path.join(self.package_folder, "lib", "tommath.dll.lib"),
-                      os.path.join(self.package_folder, "lib", "tommath.lib"))
+        rmdir(self, os.path.join(self.package_folder, "lib", "pkgconfig"))
+        rmdir(self, os.path.join(self.package_folder, "lib", "cmake"))
+        rmdir(self, os.path.join(self.package_folder, "share"))
+        rm(self, "*.pdb", os.path.join(self.package_folder, "lib"))
+        rm(self, "*.pdb", os.path.join(self.package_folder, "bin"))
 
     def package_info(self):
+        self.cpp_info.set_property("cmake_file_name", "libtommath")
+        self.cpp_info.set_property("cmake_target_name", "libtommath")
+        self.cpp_info.set_property("pkg_config_name", "libtommath")
+
         self.cpp_info.libs = ["tommath"]
+        if Version(self.version) < "1.3":
+            self.cpp_info.includedirs.append(os.path.join("include", "libtommath"))
         if not self.options.shared:
             if self.settings.os == "Windows":
                 self.cpp_info.system_libs = ["advapi32", "crypt32"]
-
-        self.cpp_info.names["pkg_config"] = "libtommath"
diff --git a/recipes/libtommath/all/patches/0001-enable-building-dll-s-using-makefile-msvc.patch b/recipes/libtommath/all/patches/0001-enable-building-dll-s-using-makefile-msvc.patch
deleted file mode 100644
index 8a24dc18457e4..0000000000000
--- a/recipes/libtommath/all/patches/0001-enable-building-dll-s-using-makefile-msvc.patch
+++ /dev/null
@@ -1,146 +0,0 @@
---- makefile.msvc
-+++ makefile.msvc
-@@ -12,13 +12,16 @@
- #The following can be overridden from command line e.g. make -f makefile.msvc CC=gcc ARFLAGS=rcs
- PREFIX    = c:\devel
- CFLAGS    = /Ox
-+LDFLAGS   =
- 
- #Compilation flags
- LTM_CFLAGS  = /nologo /I./ /D_CRT_SECURE_NO_WARNINGS /D_CRT_NONSTDC_NO_DEPRECATE /D__STDC_WANT_SECURE_LIB__=1 /D_CRT_HAS_CXX17=0 /Wall /wd4146 /wd4127 /wd4668 /wd4710 /wd4711 /wd4820 /wd5045 /WX $(CFLAGS)
--LTM_LDFLAGS = advapi32.lib
-+LTM_LDFLAGS = $(LDFLAGS) advapi32.lib
- 
--#Libraries to be created (this makefile builds only static libraries)
--LIBMAIN_S =tommath.lib
-+#Libraries to be created
-+LIBMAIN_S = tommath.lib
-+LIBMAIN_I = tommath.dll.lib
-+LIBMAIN_D = tommath.dll
- 
- #List of objects to compile (all goes to tommath.lib)
- OBJECTS=bn_cutoffs.obj bn_deprecated.obj bn_mp_2expt.obj bn_mp_abs.obj bn_mp_add.obj bn_mp_add_d.obj bn_mp_addmod.obj \
-@@ -67,15 +70,19 @@
- $(LIBMAIN_S): $(OBJECTS)
- 	lib /out:$(LIBMAIN_S) $(OBJECTS)
- 
-+#Create DLL + import library tommath.dll.lib
-+$(LIBMAIN_D) $(LIBMAIN_I): $(OBJECTS) tommath.def
-+	link /dll /out:$(LIBMAIN_D) /implib:$(LIBMAIN_I) /def:tommath.def $(LTM_LDFLAGS) $(OBJECTS)
-+
- #Build test suite
- test.exe: $(LIBMAIN_S) demo/shared.obj demo/test.obj
- 	cl $(LTM_CFLAGS) $(TOBJECTS) $(LIBMAIN_S) $(LTM_LDFLAGS) demo/shared.c demo/test.c /Fe$@
- 	@echo NOTICE: start the tests by launching test.exe
- 
- test_standalone: test.exe
- 	@echo test_standalone is deprecated, please use make-target 'test.exe'
- 
--all: $(LIBMAIN_S) test.exe
-+all: $(LIBMAIN_S) test.exe $(LIBMAIN_D)
- 
- tune: $(LIBMAIN_S)
- 	$(MAKE) -C etc tune
-@@ -85,9 +92,11 @@ clean:
- 	@-cmd /c del /Q /S *.OBJ *.LIB *.EXE *.DLL 2>nul
- 
- #Install the library + headers
--install: $(LIBMAIN_S)
-+install: $(LIBMAIN_S) $(LIBMAIN_I) $(LIBMAIN_D)
- 	cmd /c if not exist "$(PREFIX)\bin" mkdir "$(PREFIX)\bin"
- 	cmd /c if not exist "$(PREFIX)\lib" mkdir "$(PREFIX)\lib"
- 	cmd /c if not exist "$(PREFIX)\include" mkdir "$(PREFIX)\include"
- 	copy /Y $(LIBMAIN_S) "$(PREFIX)\lib"
-+	copy /Y $(LIBMAIN_I) "$(PREFIX)\lib"
-+	copy /Y $(LIBMAIN_D) "$(PREFIX)\bin"
- 	copy /Y tommath*.h "$(PREFIX)\include"
---- bn_s_mp_rand_platform.c
-+++ bn_s_mp_rand_platform.c
-@@ -14,6 +14,12 @@
-    arc4random_buf(p, n);
-    return MP_OKAY;
- }
-+#else
-+static mp_err s_read_arc4random(void *p, size_t n)
-+{
-+    (void)p; (void)n;
-+    return MP_ERR;
-+}
- #endif
- 
- #if defined(_WIN32) || defined(_WIN32_WCE)
-@@ -46,6 +46,12 @@
-    }
-    return CryptGenRandom(hProv, (DWORD)n, (BYTE *)p) == TRUE ? MP_OKAY : MP_ERR;
- }
-+#else
-+static mp_err s_read_wincsp(void *p, size_t n)
-+{
-+    (void)p; (void)n;
-+    return MP_ERR;
-+}
- #endif /* WIN32 */
- 
- #if !defined(BN_S_READ_WINCSP_C) && defined(__linux__) && defined(__GLIBC_PREREQ)
-@@ -73,6 +85,14 @@
- #endif
- #endif
- 
-+#ifndef BN_S_READ_GETRANDOM_C
-+static mp_err s_read_getrandom(void *p, size_t n)
-+{
-+    (void)p; (void)n;
-+    return MP_ERR;
-+}
-+#endif
-+
- /* We assume all platforms besides windows provide "/dev/urandom".
-  * In case yours doesn't, define MP_NO_DEV_URANDOM at compile-time.
-  */
-@@ -111,6 +131,12 @@
-    close(fd);
-    return MP_OKAY;
- }
-+#else
-+static mp_err s_read_urandom(void *p, size_t n)
-+{
-+    (void)p; (void)n;
-+    return MP_ERR;
-+}
- #endif
- 
- #if defined(MP_PRNG_ENABLE_LTM_RNG)
-@@ -126,6 +132,12 @@
-    if (res != n) return MP_ERR;
-    return MP_OKAY;
- }
-+#else
-+static mp_err s_read_ltm_rng(void *p, size_t n)
-+{
-+    (void)p; (void)n;
-+    return MP_ERR;
-+}
- #endif
- 
- mp_err s_read_arc4random(void *p, size_t n);
---- tommath.def
-+++ tommath.def
-@@ -102,6 +102,7 @@
-     mp_prime_strong_lucas_selfridge
-     mp_radix_size
-     mp_rand
-+    mp_rand_source
-     mp_read_radix
-     mp_reduce
-     mp_reduce_2k
---- bn_mp_set_double.c
-+++ bn_mp_set_double.c
-@@ -3,7 +3,7 @@
- /* LibTomMath, multiple-precision integer library -- Tom St Denis */
- /* SPDX-License-Identifier: Unlicense */
- 
--#if defined(__STDC_IEC_559__) || defined(__GCC_IEC_559)
-+#if 1
- mp_err mp_set_double(mp_int *a, double b)
- {
-    uint64_t frac;
diff --git a/recipes/libtommath/all/test_package/CMakeLists.txt b/recipes/libtommath/all/test_package/CMakeLists.txt
index 90762dc612cbd..47004d99c9835 100644
--- a/recipes/libtommath/all/test_package/CMakeLists.txt
+++ b/recipes/libtommath/all/test_package/CMakeLists.txt
@@ -1,11 +1,7 @@
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.15)
 project(test_package C)
 
-include("${CMAKE_BINARY_DIR}/conanbuildinfo.cmake")
-conan_basic_setup(TARGETS)
-
-include(FindPkgConfig)
-pkg_check_modules(LibTomMath REQUIRED IMPORTED_TARGET libtommath)
+find_package(libtommath REQUIRED CONFIG)
 
 add_executable(${PROJECT_NAME} test_package.c)
-target_link_libraries(${PROJECT_NAME} PRIVATE PkgConfig::LibTomMath)
+target_link_libraries(${PROJECT_NAME} PRIVATE libtommath)
diff --git a/recipes/libtommath/all/test_package/conanfile.py b/recipes/libtommath/all/test_package/conanfile.py
index 9e09e219fdcb3..faf72798061c5 100644
--- a/recipes/libtommath/all/test_package/conanfile.py
+++ b/recipes/libtommath/all/test_package/conanfile.py
@@ -1,13 +1,19 @@
-from conans import ConanFile, CMake, tools
+from conan import ConanFile
+from conan.tools.build import can_run
+from conan.tools.cmake import cmake_layout, CMake
 import os
 
 
-class TestPackageConan(ConanFile):
-    settings = "os", "compiler", "build_type", "arch"
-    generators = "cmake", "pkg_config"
+class TestLibTomMathConan(ConanFile):
+    settings = "os", "arch", "compiler", "build_type"
+    generators = "CMakeDeps", "CMakeToolchain", "VirtualRunEnv"
+    test_type = "explicit"
 
-    def build_requirements(self):
-        self.build_requires("pkgconf/1.7.4")
+    def requirements(self):
+        self.requires(self.tested_reference_str)
+
+    def layout(self):
+        cmake_layout(self)
 
     def build(self):
         cmake = CMake(self)
@@ -15,6 +21,6 @@ def build(self):
         cmake.build()
 
     def test(self):
-        if not tools.cross_building(self):
-            bin_path = os.path.join("bin", "test_package")
-            self.run(bin_path, run_environment=True)
+        if can_run(self):
+            bin_path = os.path.join(self.cpp.build.bindirs[0], "test_package")
+            self.run(bin_path, env="conanrun")
diff --git a/recipes/libtommath/config.yml b/recipes/libtommath/config.yml
index b8ea8afb5a353..8e76a74067f93 100644
--- a/recipes/libtommath/config.yml
+++ b/recipes/libtommath/config.yml
@@ -1,3 +1,7 @@
 versions:
+  "1.3.0":
+    folder: "all"
+  "1.2.1":
+    folder: "all"
   "1.2.0":
     folder: "all"