diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 4e5db2b68..9449620cf 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -1,4 +1,4 @@
-name: CI
+name: Release
 
 env:
   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -11,7 +11,7 @@ jobs:
   build:
     strategy:
       matrix:
-        smalltalk: [ Pharo64-9.0, Pharo64-10 ]
+        smalltalk: [ Pharo64-9.0, Pharo64-10, Pharo64-11 ]
         os: [ macos-latest, windows-latest, ubuntu-latest]
     runs-on: ${{ matrix.os }}
     name: ${{ matrix.smalltalk }} on ${{ matrix.os }}
diff --git a/.github/workflows/smalltalk-ci.yml b/.github/workflows/smalltalk-ci.yml
index 9d9536084..1e6d5c4bd 100644
--- a/.github/workflows/smalltalk-ci.yml
+++ b/.github/workflows/smalltalk-ci.yml
@@ -17,7 +17,7 @@ jobs:
       PROJECT_NAME: PolyMath-${{ matrix.smalltalk }}
     strategy:
       matrix:
-        smalltalk: [ Pharo64-9.0, Pharo64-10 ]
+        smalltalk: [ Pharo64-9.0, Pharo64-10, Pharo64-11 ]
     name: ${{ matrix.smalltalk }}
     steps:
       - uses: actions/checkout@v2
diff --git a/src/BaselineOfPolyMath/BaselineOfPolyMath.class.st b/src/BaselineOfPolyMath/BaselineOfPolyMath.class.st
index d327a9a9e..fac7a74a9 100644
--- a/src/BaselineOfPolyMath/BaselineOfPolyMath.class.st
+++ b/src/BaselineOfPolyMath/BaselineOfPolyMath.class.st
@@ -167,7 +167,14 @@ BaselineOfPolyMath >> baseline: spec [
 					with:
 					#('Math-Tests-Matrix' 'Math-Tests-Clustering' 'Math-Tests-Numerical' 'Math-Tests-Complex' 'Math-Tests-Quaternion' 'Math-Tests-Random' 'Math-Tests-ODE' 'Math-Tests-KDTree' 'Math-Tests-FunctionFit' 'Math-Tests-AutomaticDifferenciation' 'Math-Tests-FastFourierTransform' 'Math-Tests-Accuracy' 'Math-Tests-ArbitraryPrecisionFloat' 'Math-Tests-KolmogorovSmirnov' 'Math-Tests-Quantile' 'Math-Tests-Polynomials' 'Math-Tests-PrincipalComponentAnalysis' 'Math-Tests-KernelSmoothing' 'Math-Tests-Number-Extensions' 'Math-Tests-Permutation' 'Math-Tests-TSNE' 'Math-Tests-Core-Process' 'Math-Tests-Core-Distribution' 'Math-Tests-Core');
 				group: 'default'
-					with: #('Core' 'Extensions' 'Tests' 'Benchmarks' 'Accuracy') ]
+					with: #('Core' 'Extensions' 'Tests' 'Benchmarks' 'Accuracy') ].
+				
+	spec for: #( #'pharo6.x' #'pharo7.x' #'pharo8.x' #'pharo9.x' #'pharo10.x' ) do: [ 
+		spec
+			package: 'Math-Numerical' with: [ spec requires: #( 'Math-CompatibilityUpToPharo11' ) ];
+			package: 'Math-Benchmarks-KDTree' with: [ spec requires: #( 'Math-CompatibilityUpToPharo11' ) ];
+			package: 'Math-Tests-KDTree' with: [ spec requires: #( 'Math-CompatibilityUpToPharo11' ) ];
+			package: 'Math-CompatibilityUpToPharo11' ]
 ]
 
 { #category : #accessing }
diff --git a/src/Math-Benchmarks-KDTree/PMKDTreeBenchmark.class.st b/src/Math-Benchmarks-KDTree/PMKDTreeBenchmark.class.st
index 4897462e8..a5f6df24e 100644
--- a/src/Math-Benchmarks-KDTree/PMKDTreeBenchmark.class.st
+++ b/src/Math-Benchmarks-KDTree/PMKDTreeBenchmark.class.st
@@ -15,7 +15,7 @@ Class {
 		'collType',
 		'm'
 	],
-	#category : 'Math-Benchmarks-KDTree'
+	#category : #'Math-Benchmarks-KDTree'
 }
 
 { #category : #defaults }
@@ -109,7 +109,7 @@ PMKDTreeBenchmark >> collType: aSequencableCollectionClass [
 { #category : #'initialize-release' }
 PMKDTreeBenchmark >> initialize [
 	super initialize.
-	collType := FloatArray.
+	collType := Float32Array.
 	rand := Random new
 ]
 
diff --git a/src/Math-CompatibilityUpToPharo11/Float32Array.class.st b/src/Math-CompatibilityUpToPharo11/Float32Array.class.st
new file mode 100644
index 000000000..19d291a86
--- /dev/null
+++ b/src/Math-CompatibilityUpToPharo11/Float32Array.class.st
@@ -0,0 +1,6 @@
+Class {
+	#name : #Float32Array,
+	#superclass : #FloatArray,
+	#type : #words,
+	#category : #'Math-CompatibilityUpToPharo11'
+}
diff --git a/src/Math-CompatibilityUpToPharo11/package.st b/src/Math-CompatibilityUpToPharo11/package.st
new file mode 100644
index 000000000..9d9ac190d
--- /dev/null
+++ b/src/Math-CompatibilityUpToPharo11/package.st
@@ -0,0 +1 @@
+Package { #name : #'Math-CompatibilityUpToPharo11' }
diff --git a/src/Math-Numerical/PMLineSearch.class.st b/src/Math-Numerical/PMLineSearch.class.st
index 74eac714c..6ad44638e 100644
--- a/src/Math-Numerical/PMLineSearch.class.st
+++ b/src/Math-Numerical/PMLineSearch.class.st
@@ -138,9 +138,9 @@ PMLineSearch >> initialize [
 	failingMin := 1e-3.
 	useCubicApproximation := false.
 	" Values for g(0), g'(0) and g(1) "
-	boundaryValues := FloatArray new: 3.
+	boundaryValues := Float32Array new: 3.
 	" Result: x1, g(x1), x2, g(x2) "
-	extendedResult := FloatArray new: 4.
+	extendedResult := Float32Array new: 4.
 	^ self
 ]
 
diff --git a/src/Math-Tests-KDTree/PMKDTreeTest.class.st b/src/Math-Tests-KDTree/PMKDTreeTest.class.st
index 88967082e..b0f67ab8c 100644
--- a/src/Math-Tests-KDTree/PMKDTreeTest.class.st
+++ b/src/Math-Tests-KDTree/PMKDTreeTest.class.st
@@ -80,9 +80,9 @@ PMKDTreeTest >> testIndexedKDTreeSimple [
 	| r n aTree bTree |
 	r := rand next: 200.
 	aTree := PMIndexedKDTree
-		withAll: (r collect: [ :i | FloatArray with: i with: i ]).	"2-dimensional data"
+		withAll: (r collect: [ :i | Float32Array with: i with: i ]).	"2-dimensional data"
 	bTree := PMIndexedKDTree
-		withAll: (r collect: [ :i | FloatArray with: i ]).	"1-dimensional data"
+		withAll: (r collect: [ :i | Float32Array with: i ]).	"1-dimensional data"
 	1 to: 20 do: [ :v | 
 		n := 1 / v.
 		self