diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4bfcce1..c04d257 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,9 +3,6 @@ project(effil)
 
 if (NOT LUA_INCLUDE_DIR OR NOT LUA_LIBRARY)
     find_package(Lua REQUIRED)
-    if( "${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}" LESS "5.2")
-        message(FATAL_ERROR "Wrong Lua version ${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}, use 5.2 or higher")
-    endif()
 endif()
 
 include_directories(src/cpp libs/sol/single/sol ${LUA_INCLUDE_DIR})
diff --git a/src/cpp/lua-helpers.cpp b/src/cpp/lua-helpers.cpp
index a5cc08e..d1df401 100644
--- a/src/cpp/lua-helpers.cpp
+++ b/src/cpp/lua-helpers.cpp
@@ -26,13 +26,17 @@ int dumpMemoryWriter(lua_State*, const void* batch, size_t batchSize, void* stor
     return 0;
 }
 
-} // namespacce
+} // namespace
 
 std::string dumpFunction(const sol::function& f) {
     sol::state_view lua(f.lua_state());
     sol::stack::push(lua, f);
     std::string result;
+#if LUA_VERSION_NUM == 503
+    int ret = lua_dump(lua, dumpMemoryWriter, &result, 0 /* not strip debug info*/);
+#else
     int ret = lua_dump(lua, dumpMemoryWriter, &result);
+#endif
     REQUIRE(ret == LUA_OK) << "Unable to dump Lua function: " << luaError(ret);
     sol::stack::remove(lua, -1, 1);
     return result;
diff --git a/src/cpp/shared-table.cpp b/src/cpp/shared-table.cpp
index 6155be0..7b9890e 100644
--- a/src/cpp/shared-table.cpp
+++ b/src/cpp/shared-table.cpp
@@ -208,13 +208,13 @@ sol::object SharedTable::luaLength(sol::this_state state) {
     DEFFINE_METAMETHOD_CALL_0("__len");
     std::lock_guard<SpinMutex> g(data_->lock);
     size_t len = 0u;
-    sol::optional<double> value;
-    auto iter = data_->entries.find(createStoredObject(static_cast<double>(1)));
+    sol::optional<LUA_INDEX_TYPE> value;
+    auto iter = data_->entries.find(createStoredObject(static_cast<LUA_INDEX_TYPE>(1)));
     if (iter != data_->entries.end()) {
         do {
             ++len;
             ++iter;
-        } while ((iter != data_->entries.end()) && (value = storedObjectToDouble(iter->first)) &&
+        } while ((iter != data_->entries.end()) && (value = storedObjectToIndexType(iter->first)) &&
                  (static_cast<size_t>(value.value()) == len + 1));
     }
     return sol::make_object(state, len);
@@ -244,9 +244,9 @@ SharedTable::PairsIterator SharedTable::luaPairs(sol::this_state state) {
         sol::make_object(state, *this));
 }
 
-std::pair<sol::object, sol::object> ipairsNext(sol::this_state lua, SharedTable table, sol::optional<unsigned long> key) {
+std::pair<sol::object, sol::object> ipairsNext(sol::this_state lua, SharedTable table, sol::optional<LUA_INDEX_TYPE> key) {
     size_t index = key ? key.value() + 1 : 1;
-    auto objKey = createStoredObject(static_cast<double>(index));
+    auto objKey = createStoredObject(static_cast<LUA_INDEX_TYPE>(index));
     sol::object value = table.get(objKey, lua);
     if (!value.valid())
         return std::pair<sol::object, sol::object>(sol::nil, sol::nil);
diff --git a/src/cpp/stored-object.cpp b/src/cpp/stored-object.cpp
index 7a8c675..2fa3d2f 100644
--- a/src/cpp/stored-object.cpp
+++ b/src/cpp/stored-object.cpp
@@ -138,7 +138,17 @@ StoredObject fromSolObject(const SolObject& luaObject) {
         case sol::type::boolean:
             return std::make_unique<PrimitiveHolder<bool>>(luaObject);
         case sol::type::number:
-            return std::make_unique<PrimitiveHolder<double>>(luaObject);
+        {
+#if LUA_VERSION_NUM == 503
+            sol::stack::push(luaObject.lua_state(), luaObject);
+            int isInterger = lua_isinteger(luaObject.lua_state(), -1);
+            sol::stack::pop<sol::object>(luaObject.lua_state());
+            if (isInterger)
+                return std::make_unique<PrimitiveHolder<lua_Integer>>(luaObject);
+            else
+#endif // Lua5.3
+                return std::make_unique<PrimitiveHolder<lua_Number>>(luaObject);
+        }
         case sol::type::string:
             return std::make_unique<PrimitiveHolder<std::string>>(luaObject);
         case sol::type::lightuserdata:
@@ -177,7 +187,9 @@ StoredObject fromSolObject(const SolObject& luaObject) {
 
 StoredObject createStoredObject(bool value) { return std::make_unique<PrimitiveHolder<bool>>(value); }
 
-StoredObject createStoredObject(double value) { return std::make_unique<PrimitiveHolder<double>>(value); }
+StoredObject createStoredObject(lua_Number value) { return std::make_unique<PrimitiveHolder<lua_Number>>(value); }
+
+StoredObject createStoredObject(lua_Integer value) { return std::make_unique<PrimitiveHolder<lua_Integer>>(value); }
 
 StoredObject createStoredObject(const std::string& value) {
     return std::make_unique<PrimitiveHolder<std::string>>(value);
@@ -203,6 +215,8 @@ sol::optional<bool> storedObjectToBool(const StoredObject& sobj) { return getPri
 
 sol::optional<double> storedObjectToDouble(const StoredObject& sobj) { return getPrimitiveHolderData<double>(sobj); }
 
+sol::optional<LUA_INDEX_TYPE> storedObjectToIndexType(const StoredObject& sobj) { return getPrimitiveHolderData<LUA_INDEX_TYPE>(sobj); }
+
 sol::optional<std::string> storedObjectToString(const StoredObject& sobj) {
     return getPrimitiveHolderData<std::string>(sobj);
 }
diff --git a/src/cpp/stored-object.h b/src/cpp/stored-object.h
index 6768051..f4daa84 100644
--- a/src/cpp/stored-object.h
+++ b/src/cpp/stored-object.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include "utils.h"
 #include "garbage-collector.h"
 
 #include <sol.hpp>
@@ -34,14 +35,17 @@ struct StoredObjectLess {
 };
 
 StoredObject createStoredObject(bool);
-StoredObject createStoredObject(double);
+StoredObject createStoredObject(lua_Number);
+StoredObject createStoredObject(lua_Integer);
 StoredObject createStoredObject(const std::string&);
 StoredObject createStoredObject(const char*);
 StoredObject createStoredObject(const sol::object&);
 StoredObject createStoredObject(const sol::stack_object&);
 
+
 sol::optional<bool> storedObjectToBool(const StoredObject&);
 sol::optional<double> storedObjectToDouble(const StoredObject&);
+sol::optional<LUA_INDEX_TYPE> storedObjectToIndexType(const StoredObject&);
 sol::optional<std::string> storedObjectToString(const StoredObject&);
 
 } // effil
diff --git a/src/cpp/utils.h b/src/cpp/utils.h
index 3827e58..c4b75f9 100644
--- a/src/cpp/utils.h
+++ b/src/cpp/utils.h
@@ -6,6 +6,16 @@
 
 #include <sol.hpp>
 
+#if LUA_VERSION_NUM < 501 || LUA_VERSION_NUM > 503
+#   error Unsupported Lua version
+#endif
+
+#if LUA_VERSION_NUM == 503
+#   define LUA_INDEX_TYPE lua_Integer
+#else
+#   define LUA_INDEX_TYPE lua_Number
+#endif
+
 namespace effil {
 
 class Exception : public sol::error {
diff --git a/tests/lua/bootstrap-tests.lua b/tests/lua/bootstrap-tests.lua
index 96158cd..fa2a0dd 100644
--- a/tests/lua/bootstrap-tests.lua
+++ b/tests/lua/bootstrap-tests.lua
@@ -1,6 +1,9 @@
 effil = require "effil"
 test = require "u-test"
 
+local major, minor = _VERSION:match("Lua (%d).(%d)")
+LUA_VERSION = major * 10 + minor
+
 function default_tear_down()
     collectgarbage()
     effil.gc.collect()
diff --git a/tests/lua/metatable.lua b/tests/lua/metatable.lua
index 394d000..e500616 100644
--- a/tests/lua/metatable.lua
+++ b/tests/lua/metatable.lua
@@ -66,7 +66,7 @@ test.metatable.binary_op = function (metatable, metamethod, op, exp_value)
     testTable.was_called = false
     testTable.value = "left"
     operand.value = "right"
-    local left_operand, right_operand = unpack({testTable, operand})
+    local left_operand, right_operand = table.unpack({testTable, operand})
     test.equal(op(left_operand, right_operand),
         exp_value == nil and "left_right" or exp_value)
     test.is_true(testTable.was_called)
@@ -112,6 +112,8 @@ test_unary_op("len",      function(a) return #a end)
 
 test.shared_table_with_metatable.tear_down = default_tear_down
 
+if LUA_VERSION > 51 then
+
 test.shared_table_with_metatable.iterators = function (iterator_type)
     local share = effil.table()
     local iterator = iterator_type
@@ -149,6 +151,8 @@ end
 test.shared_table_with_metatable.iterators("pairs")
 test.shared_table_with_metatable.iterators("ipairs")
 
+end -- LUA_VERSION > 51
+
 test.shared_table_with_metatable.as_shared_table = function()
     local share = effil.table()
     local mt = effil.table()