diff --git a/misc/opennn/Makefile b/misc/opennn/Makefile
index 53724a28b276..cbf737ee5853 100644
--- a/misc/opennn/Makefile
+++ b/misc/opennn/Makefile
@@ -1,53 +1,55 @@
 PORTNAME=	opennn
 DISTVERSIONPREFIX=	v
-DISTVERSION=	8.0.0
+DISTVERSION=	8.0.1
 CATEGORIES=	misc # machine-learning
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Open neural networks library
 WWW=		https://www.opennn.net/ \
 		https://github.com/Artelnics/opennn
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
 BROKEN_armv7=	gcc13 fails: error: use of built-in trait '__remove_cvref(_InIter1)' in function signature, see https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278630
 
 TEST_DEPENDS=	googletest>0:devel/googletest
 
 USES=		cmake:testing dos2unix localbase:ldflags
 USE_LDCONFIG=	yes
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	Artelnics
 
 DOS2UNIX_FILES=	opennn/CMakeLists.txt
 
 CMAKE_ON=	BUILD_SHARED_LIBS
 CMAKE_OFF=	OpenNN_BUILD_EXAMPLES OpenNN_BUILD_TESTS
 CMAKE_OFF+=	OPENNN_WITH_CUDA
 CMAKE_TESTING_ON=	OpenNN_BUILD_TESTS # some tests fail, see https://github.com/Artelnics/opennn/issues/229
 CMAKE_TESTING_TARGET=
 
 CXXFLAGS_powerpc=	-O1
 CXXFLAGS_powerpc64=	-mvsx
 LDFLAGS+=	-pthread
 LDFLAGS_powerpc=	-latomic
 
 .if !exists(/usr/include/omp.h)
 LDFLAGS+=	-fopenmp
 USES+=		compiler:gcc-c++11-lib
 .else
 LDFLAGS+=	-lomp # https://github.com/Artelnics/opennn/issues/182
 USES+=		compiler:c++11-lang
 .endif
 
 do-install:
 	${MKDIR} ${STAGEDIR}${PREFIX}/include/${PORTNAME} && ${INSTALL_DATA} ${WRKSRC}/${PORTNAME}/*.h ${STAGEDIR}${PREFIX}/include/${PORTNAME}
 	${INSTALL_DATA} ${BUILD_WRKSRC}/${PORTNAME}/libopennn.so ${STAGEDIR}${PREFIX}/lib
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/lib/libopennn.so
 
 post-test:
 	@cd ${TEST_WRKSRC} && ${BUILD_WRKSRC}/bin/run_tests
 
+# tests as of 8.0.1: several tests fail, see https://github.com/Artelnics/opennn/issues/341
+
 .include <bsd.port.mk>
diff --git a/misc/opennn/distinfo b/misc/opennn/distinfo
index b310c8e83e07..316e20a2d9b7 100644
--- a/misc/opennn/distinfo
+++ b/misc/opennn/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1775624253
-SHA256 (Artelnics-opennn-v8.0.0_GH0.tar.gz) = 3f2326b4a85cc2c388baf00107a340ee91104ef5b8d7fa83b6add555e7d9ea90
-SIZE (Artelnics-opennn-v8.0.0_GH0.tar.gz) = 71452501
+TIMESTAMP = 1782967901
+SHA256 (Artelnics-opennn-v8.0.1_GH0.tar.gz) = 858a3cbfb598d95dd9ad8b7ff7a525ab97975934fb693beacb533d22064dd678
+SIZE (Artelnics-opennn-v8.0.1_GH0.tar.gz) = 76691606
diff --git a/misc/opennn/files/patch-opennn_pch.h b/misc/opennn/files/patch-opennn_pch.h
deleted file mode 100644
index dc5d7f8488fe..000000000000
--- a/misc/opennn/files/patch-opennn_pch.h
+++ /dev/null
@@ -1,11 +0,0 @@
---- opennn/pch.h.orig	2026-04-08 05:32:16 UTC
-+++ opennn/pch.h
-@@ -55,7 +55,7 @@
- #include "../eigen/unsupported/Eigen/CXX11/Tensor"
- #include "../eigen/Eigen/src/Core/util/DisableStupidWarnings.h"
- 
--#define OPENNN_CUDA // Comment this line to disable cuda files
-+//#define OPENNN_CUDA // Comment this line to disable cuda files
- 
- #ifdef OPENNN_CUDA
- 
diff --git a/misc/opennn/pkg-plist b/misc/opennn/pkg-plist
index f99796547d24..6fdf4a431b4d 100644
--- a/misc/opennn/pkg-plist
+++ b/misc/opennn/pkg-plist
@@ -1,56 +1,57 @@
 include/opennn/adaptive_moment_estimation.h
 include/opennn/addition_layer.h
 include/opennn/bounding_layer.h
 include/opennn/convolutional_layer.h
 include/opennn/correlations.h
 include/opennn/cross_entropy_error.h
 include/opennn/cross_entropy_error_3d.h
 include/opennn/dataset.h
 include/opennn/dense_layer.h
 include/opennn/embedding_layer.h
 include/opennn/flatten_layer.h
+include/opennn/formula_expression.h
 include/opennn/genetic_algorithm.h
 include/opennn/growing_inputs.h
 include/opennn/growing_neurons.h
 include/opennn/image_dataset.h
 include/opennn/image_utilities.h
 include/opennn/inputs_selection.h
 include/opennn/kmeans.h
 include/opennn/language_dataset.h
 include/opennn/layer.h
 include/opennn/levenberg_marquardt_algorithm.h
 include/opennn/loss.h
 include/opennn/mean_squared_error.h
 include/opennn/minkowski_error.h
 include/opennn/model_expression.h
 include/opennn/model_selection.h
 include/opennn/multihead_attention_layer.h
 include/opennn/neural_network.h
 include/opennn/neuron_selection.h
 include/opennn/normalization_layer_3d.h
 include/opennn/normalized_squared_error.h
 include/opennn/opennn.h
 include/opennn/optimizer.h
 include/opennn/pch.h
 include/opennn/pooling_layer.h
 include/opennn/pooling_layer_3d.h
 include/opennn/quasi_newton_method.h
 include/opennn/random_utilities.h
 include/opennn/recurrent_layer.h
 include/opennn/registry.h
 include/opennn/response_optimization.h
 include/opennn/scaling.h
 include/opennn/scaling_layer.h
 include/opennn/standard_networks.h
 include/opennn/statistics.h
 include/opennn/stochastic_gradient_descent.h
 include/opennn/string_utilities.h
 include/opennn/tensor_utilities.h
 include/opennn/testing_analysis.h
 include/opennn/time_series_dataset.h
 include/opennn/tinyxml2.h
 include/opennn/training_strategy.h
 include/opennn/unscaling_layer.h
 include/opennn/variable.h
 include/opennn/weighted_squared_error.h
 lib/libopennn.so