diff --git a/modules/entity_spell_system/data/species/species_model_data.cpp b/modules/entity_spell_system/data/species/species_model_data.cpp
index 4e5a0bd48..65de26adf 100644
--- a/modules/entity_spell_system/data/species/species_model_data.cpp
+++ b/modules/entity_spell_system/data/species/species_model_data.cpp
@@ -136,11 +136,7 @@ Vector<Variant> SpeciesModelData::get_customizable_slot_entries(const int slot_i
 	ERR_FAIL_INDEX_V(slot_index, _customizable_slots.size(), r);
 
 	for (int i = 0; i < _customizable_slots[slot_index].size(); i++) {
-#if GODOT4
-		r.push_back(_customizable_slots[slot_index][i]);
-#else
 		r.push_back(_customizable_slots[slot_index][i].get_ref_ptr());
-#endif
 	}
 	return r;
 }
diff --git a/modules/texture_packer/layers/texture_layer_merger.cpp b/modules/texture_packer/layers/texture_layer_merger.cpp
index 53d68b015..53f324494 100644
--- a/modules/texture_packer/layers/texture_layer_merger.cpp
+++ b/modules/texture_packer/layers/texture_layer_merger.cpp
@@ -22,8 +22,6 @@ SOFTWARE.
 
 #include "texture_layer_merger.h"
 
-#include "core/version.h"
-
 int TextureLayerMerger::get_width() const {
 	return _width;
 }
@@ -68,11 +66,7 @@ Ref<ImageTexture> TextureLayerMerger::get_result_as_texture() const {
 	ERR_FAIL_COND_V(!_image.is_valid(), Ref<ImageTexture>());
 
 	Ref<ImageTexture> tex;
-#if VERSION_MAJOR < 4
 	tex.instance();
-#else
-	tex.instantiate();
-#endif
 	tex->create_from_image(_image);
 
 	return tex;
@@ -166,11 +160,7 @@ void TextureLayerMerger::set_rect(const int p_index, const Rect2 &p_rect) {
 void TextureLayerMerger::remove_texture(const int p_index) {
 	ERR_FAIL_INDEX(p_index, _entries.size());
 
-#if VERSION_MAJOR < 4
 	return _entries.remove(p_index);
-#else
-	return _entries.remove_at(p_index);
-#endif
 }
 
 int TextureLayerMerger::get_texture_count() {
@@ -185,11 +175,7 @@ void TextureLayerMerger::merge() {
 	ERR_FAIL_COND(_width <= 0 || _height <= 0);
 
 	if (!_image.is_valid()) {
-#if VERSION_MAJOR < 4
 		_image.instance();
-#else
-		_image.instantiate();
-#endif
 	}
 
 	PoolVector<uint8_t> data;
@@ -224,11 +210,7 @@ void TextureLayerMerger::merge() {
 
 			ERR_CONTINUE(!atlas.is_valid());
 
-#if VERSION_MAJOR < 4
 			input_image = atlas->get_data();
-#else
-			input_image = atlas->get_image();
-#endif
 
 			Rect2 region = altas_texture->get_region();
 
@@ -244,11 +226,7 @@ void TextureLayerMerger::merge() {
 			if (rh > atlas_h)
 				rh = atlas_h;
 		} else {
-#if VERSION_MAJOR < 4
 			input_image = e.texture->get_data();
-#else
-			input_image = e.texture->get_image();
-#endif
 		}
 
 		ERR_CONTINUE(!input_image.is_valid());
@@ -334,11 +312,7 @@ void TextureLayerMerger::merge() {
 		}
 	}
 
-#if VERSION_MAJOR < 4
 	_image->create(_width, _height, (_texture_flags & Texture::FLAG_MIPMAPS) != 0, Image::FORMAT_RGBA8, data);
-#else
-	_image->create(_width, _height, true, Image::FORMAT_RGBA8, data);
-#endif
 }
 
 void TextureLayerMerger::write_base_color_to_array(PoolVector<uint8_t> &data) {
diff --git a/modules/texture_packer/layers/texture_layer_merger.h b/modules/texture_packer/layers/texture_layer_merger.h
index bbdf9b4b4..f1e231008 100644
--- a/modules/texture_packer/layers/texture_layer_merger.h
+++ b/modules/texture_packer/layers/texture_layer_merger.h
@@ -22,36 +22,14 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-
-
-
-#include "core/version.h"
-
-#if VERSION_MAJOR > 3
-#include "core/object/ref_counted.h"
-#ifndef Reference
-#define Reference RefCounted
-#endif
-#include "core/templates/vector.h"
-#include "core/io/image.h"
-#else
+#include "core/image.h"
 #include "core/reference.h"
 #include "core/vector.h"
-#include "core/image.h"
-#endif
 
 #include "core/math/rect2.h"
 #include "scene/resources/texture.h"
 
-#include "core/version.h"
-
-#if VERSION_MAJOR >= 4
-#define PoolVector Vector
-#define Texture Texture2D
-#endif
-
 class TextureLayerMerger : public Reference {
-
 	GDCLASS(TextureLayerMerger, Reference);
 
 public:
diff --git a/modules/texture_packer/texture_merger.cpp b/modules/texture_packer/texture_merger.cpp
index a5a2e73a2..3a065693a 100644
--- a/modules/texture_packer/texture_merger.cpp
+++ b/modules/texture_packer/texture_merger.cpp
@@ -87,11 +87,7 @@ void TextureMerger::set_packer(const Ref<TexturePacker> &packer) {
 Vector<Variant> TextureMerger::get_textures() {
 	Vector<Variant> r;
 	for (int i = 0; i < _textures.size(); i++) {
-#if VERSION_MAJOR < 4
 		r.push_back(_textures[i].get_ref_ptr());
-#else
-		r.push_back(_textures[i]);
-#endif
 	}
 	return r;
 }
@@ -140,13 +136,9 @@ Ref<AtlasTexture> TextureMerger::add_texture(const Ref<Texture> &texture) {
 	Ref<AtlasTexture> tex = _packer->add_texture(texture);
 
 	if (!contains) {
-#if VERSION_MAJOR < 4
 		if (has_method("_texture_added")) {
 			call("_texture_added", tex);
 		}
-#else
-		GDVIRTUAL_CALL(_texture_added, tex);
-#endif
 
 		emit_signal("texture_added", tex);
 
@@ -174,13 +166,9 @@ Ref<AtlasTexture> TextureMerger::get_texture_index(const int index) {
 
 bool TextureMerger::unref_texture_index(const int index) {
 	if (_packer->unref_texture_index(index)) {
-#if VERSION_MAJOR < 4
 		if (has_method("_texture_removed")) {
 			call("_texture_removed");
 		}
-#else
-		GDVIRTUAL_CALL(_texture_removed);
-#endif
 
 		emit_signal("texture_removed");
 
@@ -194,13 +182,9 @@ bool TextureMerger::unref_texture_index(const int index) {
 
 bool TextureMerger::unref_texture(const Ref<Texture> &texture) {
 	if (_packer->unref_texture(texture)) {
-#if VERSION_MAJOR < 4
 		if (has_method("_texture_removed")) {
 			call("_texture_removed");
 		}
-#else
-		GDVIRTUAL_CALL(_texture_removed);
-#endif
 
 		emit_signal("texture_removed");
 
@@ -215,13 +199,9 @@ bool TextureMerger::unref_texture(const Ref<Texture> &texture) {
 void TextureMerger::remove_texture_index(const int index) {
 	_packer->remove_texture_index(index);
 
-#if VERSION_MAJOR < 4
 	if (has_method("_texture_removed")) {
 		call("_texture_removed");
 	}
-#else
-	GDVIRTUAL_CALL(_texture_removed);
-#endif
 
 	emit_signal("texture_removed");
 
@@ -231,13 +211,9 @@ void TextureMerger::remove_texture_index(const int index) {
 void TextureMerger::remove_texture(const Ref<Texture> &texture) {
 	_packer->remove_texture(texture);
 
-#if VERSION_MAJOR < 4
 	if (has_method("_texture_removed")) {
 		call("_texture_removed");
 	}
-#else
-	GDVIRTUAL_CALL(_texture_removed);
-#endif
 
 	emit_signal("texture_removed");
 
@@ -262,13 +238,9 @@ int TextureMerger::get_generated_texture_count() {
 void TextureMerger::merge() {
 	_packer->merge();
 
-#if VERSION_MAJOR < 4
 	if (has_method("_texture_merged")) {
 		call("_texture_merged");
 	}
-#else
-	GDVIRTUAL_CALL(_texture_merged);
-#endif
 
 	emit_signal("texture_merged");
 }
@@ -276,11 +248,7 @@ void TextureMerger::merge() {
 TextureMerger::TextureMerger() {
 	_automatic_merge = false;
 
-#if VERSION_MAJOR < 4
 	_packer.instance();
-#else
-	_packer.instantiate();
-#endif
 
 	_packer->set_keep_original_atlases(false);
 }
@@ -313,15 +281,9 @@ void TextureMerger::_bind_methods() {
 	ADD_SIGNAL(MethodInfo("texture_added", PropertyInfo(Variant::OBJECT, "texture", PROPERTY_HINT_RESOURCE_TYPE, "AtlasTexture")));
 	ADD_SIGNAL(MethodInfo("texture_removed"));
 
-#if VERSION_MAJOR < 4
 	BIND_VMETHOD(MethodInfo("_texture_merged"));
 	BIND_VMETHOD(MethodInfo("_texture_added", PropertyInfo(Variant::OBJECT, "texture", PROPERTY_HINT_RESOURCE_TYPE, "AtlasTexture")));
 	BIND_VMETHOD(MethodInfo("_texture_removed"));
-#else
-	GDVIRTUAL_BIND(_texture_merged);
-	GDVIRTUAL_BIND(_texture_added, "texture");
-	GDVIRTUAL_BIND(_texture_removed);
-#endif
 
 	ClassDB::bind_method(D_METHOD("get_dirty"), &TextureMerger::get_dirty);
 	ClassDB::bind_method(D_METHOD("set_dirty", "value"), &TextureMerger::set_dirty);
diff --git a/modules/texture_packer/texture_merger.h b/modules/texture_packer/texture_merger.h
index 702888050..94aff5d5b 100644
--- a/modules/texture_packer/texture_merger.h
+++ b/modules/texture_packer/texture_merger.h
@@ -22,18 +22,8 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-
-
-
-#include "core/version.h"
-
-#if VERSION_MAJOR > 3
-#include "core/templates/vector.h"
-#include "core/config/engine.h"
-#else
-#include "core/vector.h"
 #include "core/engine.h"
-#endif
+#include "core/vector.h"
 
 #include "scene/main/node.h"
 
@@ -89,12 +79,6 @@ public:
 
 	void merge();
 
-#if VERSION_MAJOR >= 4
-	GDVIRTUAL0(_texture_merged);
-	GDVIRTUAL1(_texture_added, Ref<AtlasTexture>);
-	GDVIRTUAL0(_texture_removed);
-#endif
-
 	TextureMerger();
 	~TextureMerger();
 
@@ -107,7 +91,7 @@ private:
 	bool _dirty;
 
 	Ref<TexturePacker> _packer;
-	Vector<Ref<Texture> > _textures;
+	Vector<Ref<Texture>> _textures;
 };
 
 #endif
diff --git a/modules/texture_packer/texture_packer.cpp b/modules/texture_packer/texture_packer.cpp
index 9495defdb..6b5e79739 100644
--- a/modules/texture_packer/texture_packer.cpp
+++ b/modules/texture_packer/texture_packer.cpp
@@ -83,11 +83,7 @@ Ref<AtlasTexture> TexturePacker::add_texture(const Ref<Texture> &texture) {
 		}
 
 		Ref<AtlasTexture> tex;
-#if VERSION_MAJOR < 4
 		tex.instance();
-#else
-		tex.instantiate();
-#endif
 
 		tex->set_atlas(atlas_text->get_atlas());
 		tex->set_region(atlas_text->get_region());
@@ -124,11 +120,7 @@ Ref<AtlasTexture> TexturePacker::add_texture(const Ref<Texture> &texture) {
 	}
 
 	Ref<AtlasTexture> tex;
-#if VERSION_MAJOR < 4
 	tex.instance();
-#else
-	tex.instantiate();
-#endif
 
 	//Temp setup, so the texture is usable even while the atlases are generating.
 	tex->set_atlas(texture);
@@ -208,11 +200,7 @@ bool TexturePacker::unref_texture_index(const int index) {
 	int rc = --(r->refcount);
 
 	if (rc <= 0) {
-#if VERSION_MAJOR < 4
 		_rects.remove(index);
-#else
-		_rects.remove_at(index);
-#endif
 
 		r->original_texture.unref();
 		r->atlas_texture.unref();
@@ -241,11 +229,7 @@ bool TexturePacker::unref_texture(const Ref<Texture> &texture) {
 			int rc = --(r->refcount);
 
 			if (rc <= 0) {
-#if VERSION_MAJOR < 4
 				_rects.remove(i);
-#else
-				_rects.remove_at(i);
-#endif
 
 				r->original_texture.unref();
 				r->atlas_texture.unref();
@@ -286,11 +270,7 @@ void TexturePacker::remove_texture(const Ref<Texture> &texture) {
 			t = r->original_texture;
 
 		if (t == texture) {
-#if VERSION_MAJOR < 4
 			_rects.remove(i);
-#else
-			_rects.remove_at(i);
-#endif
 
 			r->original_texture.unref();
 			r->atlas_texture.unref();
@@ -382,11 +362,7 @@ void TexturePacker::merge() {
 
 				ERR_CONTINUE(!otext.is_valid());
 
-#if VERSION_MAJOR < 4
 				Ref<Image> img = otext->get_data();
-#else
-				Ref<Image> img = otext->get_image();
-#endif
 
 				ERR_CONTINUE(!img.is_valid());
 
@@ -413,25 +389,13 @@ void TexturePacker::merge() {
 			}
 
 			Ref<Image> image;
-#if VERSION_MAJOR < 4
 			image.instance();
-#else
-			image.instantiate();
-#endif
 			image->create(b.size.w, b.size.h, false, Image::FORMAT_RGBA8, data);
 
 			Ref<ImageTexture> texture;
-#if VERSION_MAJOR < 4
 			texture.instance();
-#else
-			texture.instantiate();
-#endif
 
-#if VERSION_MAJOR < 4
 			texture->create_from_image(image, _texture_flags);
-#else
-			texture->create_from_image(image);
-#endif
 
 			_generated_textures.set(i, texture);
 
@@ -476,12 +440,10 @@ int TexturePacker::get_offset_for_format(const Image::Format format) {
 		case Image::FORMAT_BPTC_RGBA:
 		case Image::FORMAT_BPTC_RGBF:
 		case Image::FORMAT_BPTC_RGBFU:
-#if VERSION_MAJOR <= 3
 		case Image::FORMAT_PVRTC2:
 		case Image::FORMAT_PVRTC2A:
 		case Image::FORMAT_PVRTC4:
 		case Image::FORMAT_PVRTC4A:
-#endif
 		case Image::FORMAT_ETC:
 		case Image::FORMAT_ETC2_R11:
 		case Image::FORMAT_ETC2_R11S:
@@ -490,13 +452,7 @@ int TexturePacker::get_offset_for_format(const Image::Format format) {
 		case Image::FORMAT_ETC2_RGB8:
 		case Image::FORMAT_ETC2_RGBA8:
 		case Image::FORMAT_ETC2_RGB8A1:
-#if VERSION_MAJOR >= 4
-		case Image::FORMAT_RGB565:
-		case Image::FORMAT_ETC2_RA_AS_RG:
-		case Image::FORMAT_DXT5_RA_AS_RG:
-#else
 		case Image::FORMAT_RGBA5551:
-#endif
 		case Image::FORMAT_MAX:
 			return 0;
 	}
@@ -505,11 +461,7 @@ int TexturePacker::get_offset_for_format(const Image::Format format) {
 }
 
 TexturePacker::TexturePacker() {
-#if VERSION_MAJOR < 4
 	_texture_flags = Texture::FLAG_MIPMAPS | Texture::FLAG_FILTER;
-#else
-	_texture_flags = 0;
-#endif
 
 	_max_atlas_size = 1024;
 	_keep_original_atlases = false;
diff --git a/modules/texture_packer/texture_packer.h b/modules/texture_packer/texture_packer.h
index e10dd5c54..870065b56 100644
--- a/modules/texture_packer/texture_packer.h
+++ b/modules/texture_packer/texture_packer.h
@@ -22,41 +22,17 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-
-
-
-#include "core/version.h"
-
-#if VERSION_MAJOR > 3
-#include "core/io/image.h"
-#include "core/object/ref_counted.h"
-#ifndef Reference
-#define Reference RefCounted
-#endif
-#include "core/templates/vector.h"
-#include "core/string/ustring.h"
-#include "core/math/color.h"
-#else
+#include "core/color.h"
 #include "core/image.h"
 #include "core/reference.h"
-#include "core/vector.h"
 #include "core/ustring.h"
-#include "core/color.h"
-#endif
+#include "core/vector.h"
 
 #include "scene/resources/texture.h"
 #include <vector>
 
 #include "rectpack2D/pack.h"
 
-#if VERSION_MAJOR >= 4
-#define PoolVector Vector
-#define Texture Texture2D
-#define PoolByteArray PackedByteArray
-
-#define REAL FLOAT
-#endif
-
 class TexturePacker : public Reference {
 	GDCLASS(TexturePacker, Reference);
 
@@ -114,7 +90,7 @@ private:
 	int _margin;
 
 	Vector<rect_xywhf *> _rects;
-	Vector<Ref<ImageTexture> > _generated_textures;
+	Vector<Ref<ImageTexture>> _generated_textures;
 };
 
 #endif
diff --git a/modules/texture_packer/texture_resource/editor_plugin_packer_image_resource.cpp b/modules/texture_packer/texture_resource/editor_plugin_packer_image_resource.cpp
index 51cef943f..f74502fca 100644
--- a/modules/texture_packer/texture_resource/editor_plugin_packer_image_resource.cpp
+++ b/modules/texture_packer/texture_resource/editor_plugin_packer_image_resource.cpp
@@ -27,11 +27,7 @@ SOFTWARE.
 void EditorPluginPackerImageResource::_notification(int p_what) {
 	switch (p_what) {
 		case NOTIFICATION_ENTER_TREE:
-#if VERSION_MAJOR < 4
 			_importer.instance();
-#else
-			_importer.instantiate();
-#endif
 			add_import_plugin(_importer);
 
 			break;
diff --git a/modules/texture_packer/texture_resource/editor_plugin_packer_image_resource.h b/modules/texture_packer/texture_resource/editor_plugin_packer_image_resource.h
index fddfd8e8a..2d6192b91 100644
--- a/modules/texture_packer/texture_resource/editor_plugin_packer_image_resource.h
+++ b/modules/texture_packer/texture_resource/editor_plugin_packer_image_resource.h
@@ -22,23 +22,13 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-
-
-
-#include "core/version.h"
-
-#if VERSION_MAJOR > 3
-#include "core/string/ustring.h"
-#else
 #include "core/ustring.h"
-#endif
 
 #include "editor/editor_plugin.h"
 
 #include "packer_image_resource_importer.h"
 
 class EditorPluginPackerImageResource : public EditorPlugin {
-
 	GDCLASS(EditorPluginPackerImageResource, EditorPlugin);
 
 public:
diff --git a/modules/texture_packer/texture_resource/packer_image_resource.cpp b/modules/texture_packer/texture_resource/packer_image_resource.cpp
index 4fe70c851..31571436b 100644
--- a/modules/texture_packer/texture_resource/packer_image_resource.cpp
+++ b/modules/texture_packer/texture_resource/packer_image_resource.cpp
@@ -73,10 +73,8 @@ Ref<Image> PackerImageResource::get_data() const {
 
 void PackerImageResource::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_data", "image"), &PackerImageResource::set_data);
-#if VERSION_MAJOR < 4
-	//for some reason this crashes on 4.0. Not yet sure why
+	
 	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "data", PROPERTY_HINT_RESOURCE_TYPE, "Image", PROPERTY_USAGE_DEFAULT), "set_data", "get_data");
-#endif
 }
 
 PackerImageResource::PackerImageResource() {
diff --git a/modules/texture_packer/texture_resource/packer_image_resource.h b/modules/texture_packer/texture_resource/packer_image_resource.h
index 940b328a6..9dcf89faa 100644
--- a/modules/texture_packer/texture_resource/packer_image_resource.h
+++ b/modules/texture_packer/texture_resource/packer_image_resource.h
@@ -22,16 +22,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-
-
-
-#include "core/version.h"
-
-#if VERSION_MAJOR > 3
-#include "core/io/image.h"
-#else
 #include "core/image.h"
-#endif
 
 #include "scene/resources/texture.h"
 
diff --git a/modules/texture_packer/texture_resource/packer_image_resource_importer.cpp b/modules/texture_packer/texture_resource/packer_image_resource_importer.cpp
index 4d3fff7dd..c354bdb2d 100644
--- a/modules/texture_packer/texture_resource/packer_image_resource_importer.cpp
+++ b/modules/texture_packer/texture_resource/packer_image_resource_importer.cpp
@@ -22,12 +22,6 @@ SOFTWARE.
 
 #include "packer_image_resource_importer.h"
 
-#include "core/version.h"
-
-#if VERSION_MAJOR >= 4
-#define REAL FLOAT
-#endif
-
 String PackerImageResourceImporter::get_importer_name() const {
 	return "packer_image_resource";
 }
@@ -74,11 +68,7 @@ Error PackerImageResourceImporter::import(const String &p_source_file, const Str
 	float scale = p_options["scale"];
 
 	Ref<Image> image;
-#if VERSION_MAJOR < 4
 	image.instance();
-#else
-	image.instantiate();
-#endif
 	Error err = ImageLoader::load_image(p_source_file, image, NULL, hdr_as_srgb, scale);
 
 	if (err != OK) {
@@ -86,11 +76,7 @@ Error PackerImageResourceImporter::import(const String &p_source_file, const Str
 	}
 
 	Ref<PackerImageResource> res;
-#if VERSION_MAJOR < 4
 	res.instance();
-#else
-	res.instantiate();
-#endif
 
 	res->set_data(image);
 
diff --git a/modules/texture_packer/texture_resource/packer_image_resource_importer.h b/modules/texture_packer/texture_resource/packer_image_resource_importer.h
index 48a7a900b..b8a34b00f 100644
--- a/modules/texture_packer/texture_resource/packer_image_resource_importer.h
+++ b/modules/texture_packer/texture_resource/packer_image_resource_importer.h
@@ -22,18 +22,8 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-
-
-
-#include "core/version.h"
-
-#if VERSION_MAJOR > 3
-#include "core/string/ustring.h"
-#include "core/io/image.h"
-#else
-#include "core/ustring.h"
 #include "core/image.h"
-#endif
+#include "core/ustring.h"
 
 #include "core/io/resource_saver.h"
 #include "editor/import/editor_import_plugin.h"
@@ -43,7 +33,6 @@ SOFTWARE.
 #include "packer_image_resource.h"
 
 class PackerImageResourceImporter : public EditorImportPlugin {
-
 	GDCLASS(PackerImageResourceImporter, EditorImportPlugin);
 
 public:
diff --git a/modules/thread_pool/thread_pool.cpp b/modules/thread_pool/thread_pool.cpp
index 04885fc92..c26dac7e9 100644
--- a/modules/thread_pool/thread_pool.cpp
+++ b/modules/thread_pool/thread_pool.cpp
@@ -24,30 +24,16 @@ SOFTWARE.
 
 */
 
-#include "core/version.h"
-
-#if VERSION_MAJOR > 3
-#include "core/config/engine.h"
-#include "core/config/project_settings.h"
-#else
 #include "core/engine.h"
 #include "core/project_settings.h"
-#endif
 
 #include "core/os/os.h"
 #include "scene/main/scene_tree.h"
 
 #include "core/version.h"
 
-#if VERSION_MAJOR >= 4
-#define CONNECT(sig, obj, target_method_class, method) connect(sig, callable_mp(obj, &target_method_class::method))
-#define DISCONNECT(sig, obj, target_method_class, method) disconnect(sig, callable_mp(obj, &target_method_class::method))
-
-#define REAL FLOAT
-#else
 #define CONNECT(sig, obj, target_method_class, method) connect(sig, obj, #method)
 #define DISCONNECT(sig, obj, target_method_class, method) disconnect(sig, obj, #method)
-#endif
 
 ThreadPool *ThreadPool::_instance;
 
diff --git a/modules/thread_pool/thread_pool.h b/modules/thread_pool/thread_pool.h
index 4263b71db..e3005f195 100644
--- a/modules/thread_pool/thread_pool.h
+++ b/modules/thread_pool/thread_pool.h
@@ -25,15 +25,8 @@ SOFTWARE.
 
 */
 
-#include "core/version.h"
-
-#if VERSION_MAJOR > 3
-#include "core/object/object.h"
-#include "core/templates/vector.h"
-#else
 #include "core/object.h"
 #include "core/vector.h"
-#endif
 
 #include "core/os/semaphore.h"
 #include "core/os/thread.h"
diff --git a/modules/thread_pool/thread_pool_execute_job.cpp b/modules/thread_pool/thread_pool_execute_job.cpp
index 5a3b803c9..cfc8d3d64 100644
--- a/modules/thread_pool/thread_pool_execute_job.cpp
+++ b/modules/thread_pool/thread_pool_execute_job.cpp
@@ -22,13 +22,7 @@ SOFTWARE.
 
 #include "thread_pool_execute_job.h"
 
-#include "core/version.h"
-
-#if VERSION_MAJOR > 3
-#include "core/variant/variant.h"
-#else
 #include "core/variant.h"
-#endif
 
 #include "core/os/os.h"
 
@@ -50,11 +44,7 @@ void ThreadPoolExecuteJob::_execute() {
 	ERR_FAIL_COND(!_object);
 	ERR_FAIL_COND(!_object->has_method(_method));
 
-#if VERSION_MAJOR < 4
 	Variant::CallError error;
-#else
-	Callable::CallError error;
-#endif
 
 	_object->call(_method, const_cast<const Variant **>(&_argptr), _argcount, error);
 }
@@ -86,28 +76,16 @@ void ThreadPoolExecuteJob::setup(const Variant &obj, const StringName &p_method,
 	}
 }
 
-#if VERSION_MAJOR < 4
 Variant ThreadPoolExecuteJob::_setup_bind(const Variant **p_args, int p_argcount, Variant::CallError &r_error) {
-#else
-Variant ThreadPoolExecuteJob::_setup_bind(const Variant **p_args, int p_argcount, Callable::CallError &r_error) {
-#endif
 	if (p_argcount < 2) {
-#if VERSION_MAJOR < 4
 		r_error.error = Variant::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS;
-#else
-		r_error.error = Callable::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS;
-#endif
 
 		r_error.argument = 1;
 		return Variant();
 	}
 
 	if (p_args[0]->get_type() != Variant::OBJECT) {
-#if VERSION_MAJOR < 4
 		r_error.error = Variant::CallError::CALL_ERROR_INVALID_ARGUMENT;
-#else
-		r_error.error = Callable::CallError::CALL_ERROR_INVALID_ARGUMENT;
-#endif
 
 		r_error.argument = 0;
 		r_error.expected = Variant::OBJECT;
@@ -115,11 +93,7 @@ Variant ThreadPoolExecuteJob::_setup_bind(const Variant **p_args, int p_argcount
 	}
 
 	if (p_args[1]->get_type() != Variant::STRING) {
-#if VERSION_MAJOR < 4
 		r_error.error = Variant::CallError::CALL_ERROR_INVALID_ARGUMENT;
-#else
-		r_error.error = Callable::CallError::CALL_ERROR_INVALID_ARGUMENT;
-#endif
 
 		r_error.argument = 1;
 		r_error.expected = Variant::STRING;
@@ -161,11 +135,7 @@ Variant ThreadPoolExecuteJob::_setup_bind(const Variant **p_args, int p_argcount
 		set_complete(true);
 	}
 
-#if VERSION_MAJOR < 4
 	r_error.error = Variant::CallError::CALL_OK;
-#else
-	r_error.error = Callable::CallError::CALL_OK;
-#endif
 
 	return Variant();
 }
diff --git a/modules/thread_pool/thread_pool_execute_job.h b/modules/thread_pool/thread_pool_execute_job.h
index ac755ba50..e5268579e 100644
--- a/modules/thread_pool/thread_pool_execute_job.h
+++ b/modules/thread_pool/thread_pool_execute_job.h
@@ -22,9 +22,6 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-
-
-
 #include "thread_pool_job.h"
 
 class ThreadPoolExecuteJob : public ThreadPoolJob {
@@ -39,11 +36,7 @@ public:
 
 	void _execute();
 	void setup(const Variant &obj, const StringName &p_method, VARIANT_ARG_LIST);
-#if VERSION_MAJOR < 4
 	Variant _setup_bind(const Variant **p_args, int p_argcount, Variant::CallError &r_error);
-#else
-	Variant _setup_bind(const Variant **p_args, int p_argcount, Callable::CallError &r_error);
-#endif
 
 	ThreadPoolExecuteJob();
 	~ThreadPoolExecuteJob();
diff --git a/modules/thread_pool/thread_pool_job.cpp b/modules/thread_pool/thread_pool_job.cpp
index d08ed5920..b67e14bef 100644
--- a/modules/thread_pool/thread_pool_job.cpp
+++ b/modules/thread_pool/thread_pool_job.cpp
@@ -22,13 +22,7 @@ SOFTWARE.
 
 #include "thread_pool_job.h"
 
-#include "core/version.h"
-
-#if VERSION_MAJOR > 3
-#include "core/variant/variant.h"
-#else
 #include "core/variant.h"
-#endif
 
 #include "core/os/os.h"
 
@@ -94,11 +88,7 @@ void ThreadPoolJob::set_method(const StringName &value) {
 }
 
 float ThreadPoolJob::get_current_execution_time() {
-#if VERSION_MAJOR < 4
 	return (OS::get_singleton()->get_system_time_msecs() - _start_time) / 1000.0;
-#else
-	return (OS::get_singleton()->get_ticks_msec() - _start_time) / 1000.0;
-#endif
 }
 
 bool ThreadPoolJob::should_do(const bool just_check) {
@@ -131,17 +121,9 @@ void ThreadPoolJob::execute() {
 
 	_current_run_stage = 0;
 
-#if VERSION_MAJOR < 4
 	_start_time = OS::get_singleton()->get_system_time_msecs();
-#else
-	_start_time = OS::get_singleton()->get_ticks_msec();
-#endif
 
-#if VERSION_MAJOR < 4
 	call("_execute");
-#else
-	GDVIRTUAL_CALL(_execute);
-#endif
 }
 
 ThreadPoolJob::ThreadPoolJob() {
@@ -175,11 +157,7 @@ void ThreadPoolJob::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("get_max_allocated_time"), &ThreadPoolJob::get_max_allocated_time);
 	ClassDB::bind_method(D_METHOD("set_max_allocated_time", "value"), &ThreadPoolJob::set_max_allocated_time);
-#if VERSION_MAJOR < 4
 	ADD_PROPERTY(PropertyInfo(Variant::REAL, "max_allocated_time"), "set_max_allocated_time", "get_max_allocated_time");
-#else
-	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "max_allocated_time"), "set_max_allocated_time", "get_max_allocated_time");
-#endif
 
 	ClassDB::bind_method(D_METHOD("get_start_time"), &ThreadPoolJob::get_start_time);
 	ClassDB::bind_method(D_METHOD("set_start_time", "value"), &ThreadPoolJob::set_start_time);
@@ -200,11 +178,7 @@ void ThreadPoolJob::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("should_do", "just_check"), &ThreadPoolJob::should_do, DEFVAL(false));
 	ClassDB::bind_method(D_METHOD("should_return"), &ThreadPoolJob::should_return);
 
-#if VERSION_MAJOR < 4
 	BIND_VMETHOD(MethodInfo("_execute"));
-#else
-	GDVIRTUAL_BIND(_execute);
-#endif
 
 	ClassDB::bind_method(D_METHOD("execute"), &ThreadPoolJob::execute);
 
diff --git a/modules/thread_pool/thread_pool_job.h b/modules/thread_pool/thread_pool_job.h
index c1320892a..8b96e7dba 100644
--- a/modules/thread_pool/thread_pool_job.h
+++ b/modules/thread_pool/thread_pool_job.h
@@ -22,21 +22,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-
-
-
-#include "core/version.h"
-
-#if VERSION_MAJOR > 3
-#include "core/object/ref_counted.h"
-#ifndef Reference
-#define Reference RefCounted
-#endif
-#include "core/object/gdvirtual.gen.inc"
-#include "core/object/script_language.h"
-#else
 #include "core/reference.h"
-#endif
 
 class ThreadPoolJob : public Reference {
 	GDCLASS(ThreadPoolJob, Reference);
@@ -78,10 +64,6 @@ public:
 
 	void execute();
 
-#if VERSION_MAJOR >= 4
-	GDVIRTUAL0(_execute);
-#endif
-
 	ThreadPoolJob();
 	~ThreadPoolJob();
 
diff --git a/modules/voxelman/world/block_voxel_structure.h b/modules/voxelman/world/block_voxel_structure.h
index be460d690..3f27d7be4 100644
--- a/modules/voxelman/world/block_voxel_structure.h
+++ b/modules/voxelman/world/block_voxel_structure.h
@@ -22,16 +22,9 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-
-
-
 #include "core/version.h"
 
-#if VERSION_MAJOR > 3
-#include "core/templates/vector.h"
-#else
 #include "core/vector.h"
-#endif
 
 #include "voxel_structure.h"