diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 332e7b9..6d2ea62 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v2
       with:
-        go-version: 1.17
+        go-version: 1.21
 
     - name: Build
       run: go build -v ./...
diff --git a/README.md b/README.md
index 33e286c..c2644de 100644
--- a/README.md
+++ b/README.md
@@ -3,8 +3,8 @@
 [![version](https://img.shields.io/github/v/tag/yaricom/goNEAT_NS.svg?sort=semver)](https://github.com/yaricom/goNEAT_NS/releases/latest)
 [![Build Status](https://travis-ci.org/yaricom/goNEAT_NS.svg?branch=master)](https://travis-ci.org/yaricom/goNEAT_NS) [![GoDoc](https://godoc.org/github.com/yaricom/goNEAT_NS/neatns?status.svg)](https://godoc.org/github.com/yaricom/goNEAT_NS/neatns) [![Go version](https://img.shields.io/badge/go-1.17-blue.svg)](https://github.com/moovweb/gvm) [![license](https://img.shields.io/github/license/yaricom/goNEAT_NS.svg)](https://github.com/yaricom/goNEAT_NS/blob/master/LICENSE) [![yaricom/goNEAT](https://tokei.rs/b1/github/yaricom/goNEAT_NS?category=lines)](https://github.com/yaricom/goNEAT_NS)
 
-| Branch | Tests                                                                                      | Coverage                                                                                                                             | Linting                                                                    | Code Security                                                                    |
-|--------|--------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------|----------------------------------------------------------------------------|
+| Branch | Tests                                                                                                                                           | Coverage                                                                                                                                      | Linting                                                                                                                                               | Code Security                                                                                                                                                                 |
+|--------|-------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | master | [![CI](https://github.com/yaricom/goNEAT_NS/actions/workflows/ci.yml/badge.svg)](https://github.com/yaricom/goNEAT_NS/actions/workflows/ci.yml) | [![codecov](https://codecov.io/gh/yaricom/goNEAT_NS/branch/master/graph/badge.svg?token=as31613DnV)](https://codecov.io/gh/yaricom/goNEAT_NS) | [![Lint](https://github.com/yaricom/goNEAT_NS/actions/workflows/lint.yml/badge.svg)](https://github.com/yaricom/goNEAT_NS/actions/workflows/lint.yml) | [![CodeQL](https://github.com/yaricom/goNEAT_NS/actions/workflows/codeql-analysis.yml/badge.svg)](https://github.com/yaricom/goNEAT_NS/actions/workflows/codeql-analysis.yml) |
 
 ## Overview
@@ -24,7 +24,7 @@ research is to test this hypothesis.
 
 ## Minimum Requirements
 
-The source code written and compiled against GO 1.17.x.
+The source code written and compiled against GO 1.21.x.
 
 ## Installation
 
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 0000000..608b4dc
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,4 @@
+# Ignore maze runners
+ignore:
+  - "examples/maze/maze_ns.go"
+  - "examples/maze/maze_obj.go"
\ No newline at end of file
diff --git a/examples/maze/common.go b/examples/maze/common.go
index adbab8f..a4ad204 100644
--- a/examples/maze/common.go
+++ b/examples/maze/common.go
@@ -4,10 +4,11 @@ package maze
 
 import (
 	"fmt"
-	"github.com/yaricom/goNEAT/v3/neat"
-	"github.com/yaricom/goNEAT/v3/neat/genetics"
-	"github.com/yaricom/goNEAT/v3/neat/network"
-	"github.com/yaricom/goNEAT_NS/v3/neatns"
+	"github.com/pkg/errors"
+	"github.com/yaricom/goNEAT/v4/neat"
+	"github.com/yaricom/goNEAT/v4/neat/genetics"
+	"github.com/yaricom/goNEAT/v4/neat/network"
+	"github.com/yaricom/goNEAT_NS/v4/neatns"
 	"math"
 )
 
@@ -49,7 +50,11 @@ func mazeSimulationEvaluate(env *Environment, org *genetics.Organism, record *Ag
 	nItem := neatns.NewNoveltyItem()
 
 	// get Organism phenotype's network depth
-	netDepth, err := org.Phenotype.MaxActivationDepthFast(1) // The max depth of the network to be activated
+	phenotype, err := org.Phenotype()
+	if err != nil {
+		return nil, false, err
+	}
+	netDepth, err := phenotype.MaxActivationDepthWithCap(1) // The max depth of the network to be activated
 	if err != nil {
 		neat.DebugLog(fmt.Sprintf(
 			"Failed to estimate maximal depth of the network. Using default depth: %d", netDepth))
@@ -62,7 +67,7 @@ func mazeSimulationEvaluate(env *Environment, org *genetics.Organism, record *Ag
 
 	// initialize maze simulation's environment specific to the provided organism - this will be a copy
 	// of primordial environment provided
-	orgEnv, err := mazeSimulationInit(*env, org, netDepth)
+	orgEnv, err := mazeSimulationInit(*env, phenotype, netDepth)
 	if err != nil {
 		return nil, false, err
 	}
@@ -70,7 +75,7 @@ func mazeSimulationEvaluate(env *Environment, org *genetics.Organism, record *Ag
 	// do a specified amount of time steps emulations or while exit not found
 	steps := 0
 	for i := 0; i < orgEnv.TimeSteps && !orgEnv.ExitFound; i++ {
-		if err = mazeSimulationStep(orgEnv, org, netDepth); err != nil {
+		if err = mazeSimulationStep(orgEnv, phenotype, netDepth); err != nil {
 			return nil, false, err
 		}
 		// store agent path points at given sample size
@@ -117,9 +122,9 @@ func mazeSimulationEvaluate(env *Environment, org *genetics.Organism, record *Ag
 
 // To initialize the maze simulation within provided environment copy and for given organism.
 // Returns new environment for simulation against given organism
-func mazeSimulationInit(env Environment, org *genetics.Organism, netDepth int) (*Environment, error) {
+func mazeSimulationInit(env Environment, phenotype *network.Network, netDepth int) (*Environment, error) {
 	// flush the neural net
-	if _, err := org.Phenotype.Flush(); err != nil {
+	if _, err := phenotype.Flush(); err != nil {
 		neat.ErrorLog("Failed to flush phenotype")
 		return nil, err
 	}
@@ -132,14 +137,14 @@ func mazeSimulationInit(env Environment, org *genetics.Organism, netDepth int) (
 	// create neural net inputs from environment
 	if inputs, err := env.GetInputs(); err != nil {
 		return nil, err
-	} else if err = org.Phenotype.LoadSensors(inputs); err != nil { // load into neural net
+	} else if err = phenotype.LoadSensors(inputs); err != nil { // load into neural net
 		return nil, err
 	}
 
 	// propagate input through the phenotype net
 
 	// Use depth to ensure full relaxation
-	if _, err := org.Phenotype.ForwardSteps(netDepth); err != nil && err != network.ErrNetExceededMaxActivationAttempts {
+	if _, err := phenotype.ForwardSteps(netDepth); err != nil && !errors.Is(err, network.ErrNetExceededMaxActivationAttempts) {
 		neat.ErrorLog(fmt.Sprintf("Failed to activate network at simulation init: %s", err))
 		return nil, err
 	}
@@ -148,21 +153,21 @@ func mazeSimulationInit(env Environment, org *genetics.Organism, netDepth int) (
 }
 
 // To execute a time step of the maze simulation evaluation within given Environment for provided Organism
-func mazeSimulationStep(env *Environment, org *genetics.Organism, netDepth int) error {
+func mazeSimulationStep(env *Environment, phenotype *network.Network, netDepth int) error {
 	// get simulation parameters as inputs to organism's network
 	if inputs, err := env.GetInputs(); err != nil {
 		return err
-	} else if err = org.Phenotype.LoadSensors(inputs); err != nil {
+	} else if err = phenotype.LoadSensors(inputs); err != nil {
 		neat.ErrorLog("Failed to load sensors")
 		return err
 	}
-	if _, err := org.Phenotype.ForwardSteps(netDepth); err != nil && err != network.ErrNetExceededMaxActivationAttempts {
+	if _, err := phenotype.ForwardSteps(netDepth); err != nil && !errors.Is(err, network.ErrNetExceededMaxActivationAttempts) {
 		neat.ErrorLog(fmt.Sprintf("Failed to activate network at simulation init: %s", err))
 		return err
 	}
 
 	// use the net's outputs to change heading and velocity of maze agent
-	if err := env.ApplyOutputs(org.Phenotype.Outputs[0].Activation, org.Phenotype.Outputs[1].Activation); err != nil {
+	if err := env.ApplyOutputs(phenotype.Outputs[0].Activation, phenotype.Outputs[1].Activation); err != nil {
 		neat.ErrorLog("Failed to apply outputs")
 		return err
 	}
diff --git a/examples/maze/common_test.go b/examples/maze/common_test.go
index d1c9fb8..d5d2fa1 100644
--- a/examples/maze/common_test.go
+++ b/examples/maze/common_test.go
@@ -2,7 +2,7 @@ package maze
 
 import (
 	"github.com/stretchr/testify/assert"
-	"github.com/yaricom/goNEAT/v3/neat"
+	"github.com/yaricom/goNEAT/v4/neat"
 	"testing"
 )
 
diff --git a/examples/maze/maze_ns.go b/examples/maze/maze_ns.go
index 7b3dd66..210ec73 100644
--- a/examples/maze/maze_ns.go
+++ b/examples/maze/maze_ns.go
@@ -3,11 +3,12 @@ package maze
 import (
 	"context"
 	"fmt"
-	"github.com/yaricom/goNEAT/v3/experiment"
-	"github.com/yaricom/goNEAT/v3/experiment/utils"
-	"github.com/yaricom/goNEAT/v3/neat"
-	"github.com/yaricom/goNEAT/v3/neat/genetics"
-	"github.com/yaricom/goNEAT_NS/v3/neatns"
+	"github.com/pkg/errors"
+	"github.com/yaricom/goNEAT/v4/experiment"
+	"github.com/yaricom/goNEAT/v4/experiment/utils"
+	"github.com/yaricom/goNEAT/v4/neat"
+	"github.com/yaricom/goNEAT/v4/neat/genetics"
+	"github.com/yaricom/goNEAT_NS/v4/neatns"
 	"math"
 	"os"
 )
@@ -48,7 +49,7 @@ type noveltySearchEvaluator struct {
 	compatAdjustFreq int
 }
 
-func (e noveltySearchEvaluator) TrialRunStarted(trial *experiment.Trial) {
+func (e *noveltySearchEvaluator) TrialRunStarted(trial *experiment.Trial) {
 	opts := neatns.DefaultNoveltyArchiveOptions()
 	opts.KNNNoveltyScore = 10
 	trialSim = mazeSimResults{
@@ -58,17 +59,17 @@ func (e noveltySearchEvaluator) TrialRunStarted(trial *experiment.Trial) {
 	}
 }
 
-func (e noveltySearchEvaluator) TrialRunFinished(_ *experiment.Trial) {
+func (e *noveltySearchEvaluator) TrialRunFinished(_ *experiment.Trial) {
 	// the last epoch executed
 	e.storeRecorded()
 }
 
-func (e noveltySearchEvaluator) EpochEvaluated(_ *experiment.Trial, _ *experiment.Generation) {
+func (e *noveltySearchEvaluator) EpochEvaluated(_ *experiment.Trial, _ *experiment.Generation) {
 	// just stub
 }
 
 // GenerationEvaluate this method evaluates one epoch for given population and prints results into output directory if any.
-func (e noveltySearchEvaluator) GenerationEvaluate(ctx context.Context, pop *genetics.Population, epoch *experiment.Generation) error {
+func (e *noveltySearchEvaluator) GenerationEvaluate(ctx context.Context, pop *genetics.Population, epoch *experiment.Generation) error {
 	options, ok := neat.FromContext(ctx)
 	if !ok {
 		return neat.ErrNEATOptionsNotFound
@@ -110,9 +111,7 @@ func (e noveltySearchEvaluator) GenerationEvaluate(ctx context.Context, pop *gen
 	if epoch.Solved {
 		// print winner organism
 		org := epoch.Champion
-		if depth, err := org.Phenotype.MaxActivationDepthFast(0); err == nil {
-			neat.InfoLog(fmt.Sprintf("Activation depth of the winner: %d\n", depth))
-		}
+		utils.PrintActivationDepth(org, true)
 
 		genomeFile := "mazens_winner"
 		// Prints the winner organism's Genome to the file!
@@ -189,7 +188,7 @@ func (e *noveltySearchEvaluator) orgEvaluate(org *genetics.Organism, pop *geneti
 	// evaluate individual organism and get novelty point
 	nItem, solved, err := mazeSimulationEvaluate(e.mazeEnv, org, &record, nil)
 	if err != nil {
-		if err == ErrOutputIsNaN {
+		if errors.Is(err, ErrOutputIsNaN) {
 			// corrupted genome, but OK to continue evolutionary process
 			return false, nil
 		}
diff --git a/examples/maze/maze_obj.go b/examples/maze/maze_obj.go
index 03b0d1e..4fd0b68 100644
--- a/examples/maze/maze_obj.go
+++ b/examples/maze/maze_obj.go
@@ -3,11 +3,12 @@ package maze
 import (
 	"context"
 	"fmt"
-	"github.com/yaricom/goNEAT/v3/experiment"
-	"github.com/yaricom/goNEAT/v3/experiment/utils"
-	"github.com/yaricom/goNEAT/v3/neat"
-	"github.com/yaricom/goNEAT/v3/neat/genetics"
-	"github.com/yaricom/goNEAT_NS/v3/neatns"
+	"github.com/pkg/errors"
+	"github.com/yaricom/goNEAT/v4/experiment"
+	"github.com/yaricom/goNEAT/v4/experiment/utils"
+	"github.com/yaricom/goNEAT/v4/neat"
+	"github.com/yaricom/goNEAT/v4/neat/genetics"
+	"github.com/yaricom/goNEAT_NS/v4/neatns"
 	"os"
 )
 
@@ -38,7 +39,7 @@ type objectiveEvaluator struct {
 	compatAdjustFreq int
 }
 
-func (e objectiveEvaluator) TrialRunStarted(trial *experiment.Trial) {
+func (e *objectiveEvaluator) TrialRunStarted(trial *experiment.Trial) {
 	trialSim = mazeSimResults{
 		trialID: trial.Id,
 		records: new(RecordStore),
@@ -46,17 +47,17 @@ func (e objectiveEvaluator) TrialRunStarted(trial *experiment.Trial) {
 	}
 }
 
-func (e objectiveEvaluator) TrialRunFinished(_ *experiment.Trial) {
+func (e *objectiveEvaluator) TrialRunFinished(_ *experiment.Trial) {
 	// the last epoch executed
 	e.storeRecorded()
 }
 
-func (e objectiveEvaluator) EpochEvaluated(_ *experiment.Trial, _ *experiment.Generation) {
+func (e *objectiveEvaluator) EpochEvaluated(_ *experiment.Trial, _ *experiment.Generation) {
 	// just stub
 }
 
 // GenerationEvaluate evaluates one epoch for given population and prints results into output directory if any.
-func (e objectiveEvaluator) GenerationEvaluate(ctx context.Context, pop *genetics.Population, epoch *experiment.Generation) error {
+func (e *objectiveEvaluator) GenerationEvaluate(ctx context.Context, pop *genetics.Population, epoch *experiment.Generation) error {
 	options, ok := neat.FromContext(ctx)
 	if !ok {
 		return neat.ErrNEATOptionsNotFound
@@ -90,9 +91,7 @@ func (e objectiveEvaluator) GenerationEvaluate(ctx context.Context, pop *genetic
 	if epoch.Solved {
 		// print winner organism
 		org := epoch.Champion
-		if depth, err := org.Phenotype.MaxActivationDepthFast(0); err == nil {
-			neat.InfoLog(fmt.Sprintf("Activation depth of the winner: %d\n", depth))
-		}
+		utils.PrintActivationDepth(org, true)
 
 		genomeFile := "maze_obj_winner"
 		// Prints the winner organism to file!
@@ -154,7 +153,7 @@ func (e *objectiveEvaluator) orgEvaluate(org *genetics.Organism, _ *genetics.Pop
 	// evaluate individual organism and get novelty point holding simulation results
 	nItem, solved, err := mazeSimulationEvaluate(e.mazeEnv, org, &record, nil)
 	if err != nil {
-		if err == ErrOutputIsNaN {
+		if errors.Is(err, ErrOutputIsNaN) {
 			// corrupted genome, but OK to continue evolutionary process
 			return false, nil
 		}
diff --git a/executor.go b/executor.go
index cc1e725..f88dd24 100644
--- a/executor.go
+++ b/executor.go
@@ -4,10 +4,10 @@ import (
 	"context"
 	"flag"
 	"fmt"
-	"github.com/yaricom/goNEAT/v3/experiment"
-	"github.com/yaricom/goNEAT/v3/neat"
-	"github.com/yaricom/goNEAT/v3/neat/genetics"
-	"github.com/yaricom/goNEAT_NS/v3/examples/maze"
+	"github.com/yaricom/goNEAT/v4/experiment"
+	"github.com/yaricom/goNEAT/v4/neat"
+	"github.com/yaricom/goNEAT/v4/neat/genetics"
+	"github.com/yaricom/goNEAT_NS/v4/examples/maze"
 	"log"
 	"math/rand"
 	"os"
diff --git a/go.mod b/go.mod
index 4691d20..231af11 100644
--- a/go.mod
+++ b/go.mod
@@ -1,22 +1,22 @@
-module github.com/yaricom/goNEAT_NS/v3
+module github.com/yaricom/goNEAT_NS/v4
 
-go 1.17
+go 1.21
 
 require (
 	github.com/fogleman/gg v1.3.0
-	github.com/stretchr/testify v1.7.1
-	github.com/yaricom/goNEAT/v3 v3.0.1
+	github.com/pkg/errors v0.9.1
+	github.com/stretchr/testify v1.8.4
+	github.com/yaricom/goNEAT/v4 v4.0.1
 )
 
 require (
-	github.com/davecgh/go-spew v1.1.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
-	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/sbinet/npyio v0.6.0 // indirect
-	github.com/spf13/cast v1.5.0 // indirect
-	golang.org/x/exp v0.0.0-20191002040644-a1355ae1e2c3 // indirect
-	golang.org/x/image v0.0.0-20220302094943-723b81ca9867 // indirect
-	gonum.org/v1/gonum v0.11.0 // indirect
+	github.com/sbinet/npyio v0.7.0 // indirect
+	github.com/spf13/cast v1.5.1 // indirect
+	golang.org/x/exp v0.0.0-20230321023759-10a507213a29 // indirect
+	golang.org/x/image v0.6.0 // indirect
+	gonum.org/v1/gonum v0.13.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/go.sum b/go.sum
index 669307c..c2d62e8 100644
--- a/go.sum
+++ b/go.sum
@@ -1,96 +1,71 @@
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-gioui.org v0.0.0-20210308172011-57750fc8a0a6/go.mod h1:RSH6KIUZ0p2xy5zHDxgAM4zumjgTw83q2ge/PI+yyw8=
-github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
-github.com/ajstarks/svgo v0.0.0-20180226025133-644b8db467af/go.mod h1:K08gAheRH3/J6wwsYMMT4xOr94bZjxIelGM0+d/wbFw=
-github.com/boombuler/barcode v1.0.0/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
-github.com/campoy/embedmd v1.0.0/go.mod h1:oxyr9RCiSXg0M3VJ3ks0UGfp98BpSSGr0kpiX3MzVl8=
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/fogleman/gg v1.2.1-0.20190220221249-0403632d5b90/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/fogleman/gg v1.3.0 h1:/7zJX8F6AaYQc57WQCyN9cAIz+4bCJGO9B+dyW29am8=
 github.com/fogleman/gg v1.3.0/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
-github.com/frankban/quicktest v1.14.3 h1:FJKSZTDHjyhriyC81FLQ0LY93eSai0ZyR/ZIkd3ZUKE=
-github.com/go-fonts/dejavu v0.1.0/go.mod h1:4Wt4I4OU2Nq9asgDCteaAaWZOV24E+0/Pwo0gppep4g=
-github.com/go-fonts/latin-modern v0.2.0/go.mod h1:rQVLdDMK+mK1xscDwsqM5J8U2jrRa3T0ecnM9pNujks=
-github.com/go-fonts/liberation v0.1.1/go.mod h1:K6qoJYypsmfVjWg8KOVDQhLc8UDgIK2HYqyqAO9z7GY=
-github.com/go-fonts/stix v0.1.0/go.mod h1:w/c1f0ldAUlJmLBvlbkvVXLAD+tAMqobIIQpmnUIzUY=
-github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
-github.com/go-latex/latex v0.0.0-20210118124228-b3d85cf34e07/go.mod h1:CO1AlKB2CSIqUrmQPqA0gdRIlnLEY0gK5JGjh37zN5U=
+github.com/frankban/quicktest v1.14.4 h1:g2rn0vABPOOXmZUj+vbmUp0lPoXEMuhTpIluN0XL9UY=
+github.com/frankban/quicktest v1.14.4/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
-github.com/google/go-cmp v0.5.7 h1:81/ik6ipDQS2aGcBfIN5dHDB36BwrStyeAQquSYCV4o=
-github.com/jung-kurt/gofpdf v1.0.0/go.mod h1:7Id9E/uU8ce6rXgefFLlgrJj/GYY22cpxn+r32jIOes=
-github.com/jung-kurt/gofpdf v1.0.3-0.20190309125859-24315acbbda5/go.mod h1:7Id9E/uU8ce6rXgefFLlgrJj/GYY22cpxn+r32jIOes=
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 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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diff --git a/neatns/novelty_archive.go b/neatns/novelty_archive.go
index 1692eb5..09fc6c3 100644
--- a/neatns/novelty_archive.go
+++ b/neatns/novelty_archive.go
@@ -3,8 +3,8 @@ package neatns
 import (
 	"errors"
 	"fmt"
-	"github.com/yaricom/goNEAT/v3/neat"
-	"github.com/yaricom/goNEAT/v3/neat/genetics"
+	"github.com/yaricom/goNEAT/v4/neat"
+	"github.com/yaricom/goNEAT/v4/neat/genetics"
 	"sort"
 )
 
diff --git a/neatns/novelty_archive_test.go b/neatns/novelty_archive_test.go
index 0dc4d7c..c250615 100644
--- a/neatns/novelty_archive_test.go
+++ b/neatns/novelty_archive_test.go
@@ -3,8 +3,9 @@ package neatns
 import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"github.com/yaricom/goNEAT/v3/neat"
-	"github.com/yaricom/goNEAT/v3/neat/genetics"
+	"github.com/yaricom/goNEAT/v4/neat"
+	"github.com/yaricom/goNEAT/v4/neat/genetics"
+	"github.com/yaricom/goNEAT/v4/neat/math"
 	"math/rand"
 	"strings"
 	"testing"
@@ -133,6 +134,7 @@ func createRandomPopulation(in, out, maxHidden int, linkProb float64) (*genetics
 	conf := &neat.Options{
 		CompatThreshold: 0.5,
 		PopSize:         10,
+		NodeActivators:  []math.NodeActivationType{math.SigmoidSteepenedActivation},
 	}
 	pop, err := genetics.NewPopulationRandom(in, out, maxHidden, false, linkProb, conf)
 	if err != nil {
diff --git a/tools/maze_utils.go b/tools/maze_utils.go
index 0bbf4b1..d1b028e 100644
--- a/tools/maze_utils.go
+++ b/tools/maze_utils.go
@@ -5,7 +5,7 @@ import (
 	"flag"
 	"fmt"
 	"github.com/fogleman/gg"
-	"github.com/yaricom/goNEAT_NS/v3/examples/maze"
+	"github.com/yaricom/goNEAT_NS/v4/examples/maze"
 	"image"
 	"image/color"
 	"io"