diff --git a/misc/opennn/Makefile b/misc/opennn/Makefile
index 391fc35afab0..700135e51173 100644
--- a/misc/opennn/Makefile
+++ b/misc/opennn/Makefile
@@ -1,49 +1,29 @@
 PORTNAME=	opennn
-DISTVERSION=	4.0
+DISTVERSION=	5.0.5
 CATEGORIES=	misc # machine-learning
-MASTER_SITES=	SF/${PORTNAME}/
-DISTNAME=	${PORTNAME}_${DISTVERSION}
+MASTER_SITES=	https://github.com/Artelnics/opennn/archive/refs/tags/v${DISTVERSION}${EXTRACT_SUFX}?dummy=/
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Open neural networks library
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
 USES=		cmake compiler dos2unix zip
 DOS2UNIX_FILES=	opennn/CMakeLists.txt
 USE_LDCONFIG=	yes
 
 CMAKE_OFF=	OpenNN_BUILD_EXAMPLES OpenNN_BUILD_TESTS
+LDFLAGS+=	-lomp -pthread # https://github.com/Artelnics/opennn/issues/182
 
-OPTIONS_DEFINE=		MPI OPENMP
-OPTIONS_DEFAULT=	OPENMP
+OPTIONS_DEFINE=		MPI
 
 MPI_CMAKE_BOOL=		__OPENNN_MPI__
-MPI_BROKEN=		https://github.com/Artelnics/OpenNN/issues/86
-
-OPENMP_CMAKE_BOOL=	__OPENNN_OMP__
-
-.include <bsd.port.pre.mk>
-
-.if ${CHOSEN_COMPILER_TYPE} == gcc
-USE_GCC=	yes
-.else
-# workaround for breakage with clang-10: https://github.com/Artelnics/OpenNN/issues/105
-LLVM_VER=	80
-BUILD_DEPENDS+=	clang${LLVM_VER}:devel/llvm${LLVM_VER}
-CPP=		clang-cpp${LLVM_VER}
-CC=		clang${LLVM_VER}
-CXX=		clang++${LLVM_VER}
-# clang-8 defaults to elfv1 on FreeBSD, to be removed after moving to 9 or newer
-.if ${ARCH} == powerpc64
-CFLAGS+=	-mabi=elfv2
-.endif
-.endif
+MPI_BROKEN=		deactivated: https://github.com/Artelnics/OpenNN/issues/86
 
 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
 
-.include <bsd.port.post.mk>
+.include <bsd.port.mk>
diff --git a/misc/opennn/distinfo b/misc/opennn/distinfo
index 8c4104f956b2..b36a671d3129 100644
--- a/misc/opennn/distinfo
+++ b/misc/opennn/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1590628765
-SHA256 (opennn_4.0.zip) = f0ade93fe24b88eea90aeee85f5c70066ed6c087a34240752178ecd68861f975
-SIZE (opennn_4.0.zip) = 6656578
+TIMESTAMP = 1619739429
+SHA256 (opennn-5.0.5.zip) = 9aafeb305793591077cbafda8adbd2ab24b85500915cfce711e5f0d54d5fcd69
+SIZE (opennn-5.0.5.zip) = 47522909
diff --git a/misc/opennn/pkg-plist b/misc/opennn/pkg-plist
index be7ee0b89bdd..4bf0692971eb 100644
--- a/misc/opennn/pkg-plist
+++ b/misc/opennn/pkg-plist
@@ -1,53 +1,47 @@
 include/opennn/adaptive_moment_estimation.h
 include/opennn/bounding_layer.h
+include/opennn/config.h
 include/opennn/conjugate_gradient.h
 include/opennn/convolutional_layer.h
 include/opennn/correlations.h
 include/opennn/cross_entropy_error.h
 include/opennn/data_set.h
-include/opennn/functions.h
 include/opennn/genetic_algorithm.h
 include/opennn/gradient_descent.h
 include/opennn/growing_inputs.h
-include/opennn/incremental_neurons.h
+include/opennn/growing_neurons.h
 include/opennn/inputs_selection.h
-include/opennn/k_means.h
 include/opennn/layer.h
 include/opennn/learning_rate_algorithm.h
 include/opennn/levenberg_marquardt_algorithm.h
 include/opennn/long_short_term_memory_layer.h
 include/opennn/loss_index.h
-include/opennn/matrix.h
 include/opennn/mean_squared_error.h
-include/opennn/metrics.h
 include/opennn/minkowski_error.h
 include/opennn/model_selection.h
 include/opennn/neural_network.h
 include/opennn/neurons_selection.h
 include/opennn/normalized_squared_error.h
 include/opennn/numerical_differentiation.h
 include/opennn/opennn.h
 include/opennn/opennn_strings.h
 include/opennn/optimization_algorithm.h
 include/opennn/perceptron_layer.h
 include/opennn/pooling_layer.h
 include/opennn/principal_components_layer.h
 include/opennn/probabilistic_layer.h
 include/opennn/pruning_inputs.h
 include/opennn/quasi_newton_method.h
 include/opennn/recurrent_layer.h
 include/opennn/response_optimization.h
 include/opennn/scaling_layer.h
 include/opennn/statistics.h
 include/opennn/stochastic_gradient_descent.h
 include/opennn/sum_squared_error.h
-include/opennn/tensor.h
 include/opennn/testing_analysis.h
 include/opennn/tinyxml2.h
 include/opennn/training_strategy.h
-include/opennn/transformations.h
 include/opennn/unit_testing.h
 include/opennn/unscaling_layer.h
-include/opennn/vector.h
 include/opennn/weighted_squared_error.h
 lib/libopennn.so