diff --git a/examples/v1/pipelineruns/alpha/pipelinerun-with-matrix-and-results.yaml b/examples/v1/pipelineruns/beta/pipelinerun-with-matrix-and-results.yaml
similarity index 100%
rename from examples/v1/pipelineruns/alpha/pipelinerun-with-matrix-and-results.yaml
rename to examples/v1/pipelineruns/beta/pipelinerun-with-matrix-and-results.yaml
diff --git a/examples/v1/pipelineruns/alpha/pipelinerun-with-matrix-array-references.yaml b/examples/v1/pipelineruns/beta/pipelinerun-with-matrix-array-references.yaml
similarity index 100%
rename from examples/v1/pipelineruns/alpha/pipelinerun-with-matrix-array-references.yaml
rename to examples/v1/pipelineruns/beta/pipelinerun-with-matrix-array-references.yaml
diff --git a/examples/v1/pipelineruns/alpha/pipelinerun-with-matrix-include-explicit.yaml b/examples/v1/pipelineruns/beta/pipelinerun-with-matrix-include-explicit.yaml
similarity index 100%
rename from examples/v1/pipelineruns/alpha/pipelinerun-with-matrix-include-explicit.yaml
rename to examples/v1/pipelineruns/beta/pipelinerun-with-matrix-include-explicit.yaml
diff --git a/examples/v1/pipelineruns/alpha/pipelinerun-with-matrix-include.yaml b/examples/v1/pipelineruns/beta/pipelinerun-with-matrix-include.yaml
similarity index 100%
rename from examples/v1/pipelineruns/alpha/pipelinerun-with-matrix-include.yaml
rename to examples/v1/pipelineruns/beta/pipelinerun-with-matrix-include.yaml
diff --git a/examples/v1/pipelineruns/alpha/pipelinerun-with-matrix.yaml b/examples/v1/pipelineruns/beta/pipelinerun-with-matrix.yaml
similarity index 100%
rename from examples/v1/pipelineruns/alpha/pipelinerun-with-matrix.yaml
rename to examples/v1/pipelineruns/beta/pipelinerun-with-matrix.yaml
diff --git a/pkg/apis/pipeline/v1/pipeline_validation.go b/pkg/apis/pipeline/v1/pipeline_validation.go
index 71b002d9bcd..f2ac8a18a0a 100644
--- a/pkg/apis/pipeline/v1/pipeline_validation.go
+++ b/pkg/apis/pipeline/v1/pipeline_validation.go
@@ -230,9 +230,9 @@ func (pt PipelineTask) Validate(ctx context.Context) (errs *apis.FieldError) {
 
 func (pt *PipelineTask) validateMatrix(ctx context.Context) (errs *apis.FieldError) {
 	if pt.IsMatrixed() {
-		// This is an alpha feature and will fail validation if it's used in a pipeline spec
-		// when the enable-api-fields feature gate is anything but "alpha".
-		errs = errs.Also(version.ValidateEnabledAPIFields(ctx, "matrix", config.AlphaAPIFields))
+		// This is a beta feature and will fail validation if it's used in a pipeline spec
+		// when the enable-api-fields feature gate is set to "stable".
+		errs = errs.Also(version.ValidateEnabledAPIFields(ctx, "matrix", config.BetaAPIFields))
 		errs = errs.Also(pt.Matrix.validateCombinationsCount(ctx))
 		errs = errs.Also(pt.Matrix.validateUniqueParams())
 	}
diff --git a/pkg/reconciler/pipelinerun/pipelinerun_test.go b/pkg/reconciler/pipelinerun/pipelinerun_test.go
index ab35dc88702..9d65c8309d5 100644
--- a/pkg/reconciler/pipelinerun/pipelinerun_test.go
+++ b/pkg/reconciler/pipelinerun/pipelinerun_test.go
@@ -7039,7 +7039,7 @@ spec:
 `),
 	}
 
-	cms := []*corev1.ConfigMap{withEnabledAlphaAPIFields(newFeatureFlagsConfigMap())}
+	cms := []*corev1.ConfigMap{newFeatureFlagsConfigMap()}
 	d := test.Data{
 		ConfigMaps:   cms,
 		PipelineRuns: prs,
@@ -8215,7 +8215,7 @@ spec:
     kind: Task
  `),
 	}
-	cms := []*corev1.ConfigMap{withEnabledAlphaAPIFields(newFeatureFlagsConfigMap())}
+	cms := []*corev1.ConfigMap{newFeatureFlagsConfigMap()}
 	cms = append(cms, withMaxMatrixCombinationsCount(newDefaultsConfigMap(), 10))
 
 	tests := []struct {
@@ -8591,8 +8591,7 @@ spec:
       script: |
         echo "$(params.platform) and $(params.browser)"
 `)
-
-	cms := []*corev1.ConfigMap{withEnabledAlphaAPIFields(newFeatureFlagsConfigMap())}
+	cms := []*corev1.ConfigMap{newFeatureFlagsConfigMap()}
 	cms = append(cms, withMaxMatrixCombinationsCount(newDefaultsConfigMap(), 10))
 
 	tests := []struct {
@@ -8976,7 +8975,7 @@ spec:
     kind: Task
 `),
 	}
-	cms := []*corev1.ConfigMap{withEnabledAlphaAPIFields(newFeatureFlagsConfigMap())}
+	cms := []*corev1.ConfigMap{newFeatureFlagsConfigMap()}
 	cms = append(cms, withMaxMatrixCombinationsCount(newDefaultsConfigMap(), 10))
 
 	tests := []struct {
@@ -9434,7 +9433,7 @@ spec:
     kind: Task
 `),
 	}
-	cms := []*corev1.ConfigMap{withEnabledAlphaAPIFields(newFeatureFlagsConfigMap())}
+	cms := []*corev1.ConfigMap{newFeatureFlagsConfigMap()}
 	cms = append(cms, withMaxMatrixCombinationsCount(newDefaultsConfigMap(), 10))
 
 	tests := []struct {
@@ -9795,7 +9794,7 @@ spec:
     kind: Task
 `),
 	}
-	cms := []*corev1.ConfigMap{withEnabledAlphaAPIFields(newFeatureFlagsConfigMap())}
+	cms := []*corev1.ConfigMap{newFeatureFlagsConfigMap()}
 	cms = append(cms, withMaxMatrixCombinationsCount(newDefaultsConfigMap(), 10))
 
 	tests := []struct {
@@ -10225,7 +10224,7 @@ spec:
         echo -n "[\"linux\",\"mac\",\"windows\"]" | tee $(results.platforms.path)
 `)
 
-	cms := []*corev1.ConfigMap{withEnabledAlphaAPIFields(newFeatureFlagsConfigMap())}
+	cms := []*corev1.ConfigMap{newFeatureFlagsConfigMap()}
 	cms = append(cms, withMaxMatrixCombinationsCount(newDefaultsConfigMap(), 10))
 	tests := []struct {
 		name                string
@@ -10768,7 +10767,8 @@ spec:
     tekton.dev/pipeline: p-dag
 `),
 	}
-	cms := []*corev1.ConfigMap{withEnabledAlphaAPIFields(newFeatureFlagsConfigMap())}
+
+	cms := []*corev1.ConfigMap{newFeatureFlagsConfigMap()}
 	cms = append(cms, withMaxMatrixCombinationsCount(newDefaultsConfigMap(), 10))
 	tests := []struct {
 		name                string
@@ -10945,7 +10945,7 @@ spec:
         exit 1
 `)
 
-	cms := []*corev1.ConfigMap{withEnabledAlphaAPIFields(newFeatureFlagsConfigMap())}
+	cms := []*corev1.ConfigMap{newFeatureFlagsConfigMap()}
 	cms = append(cms, withMaxMatrixCombinationsCount(newDefaultsConfigMap(), 10))
 
 	tests := []struct {
@@ -11567,7 +11567,7 @@ spec:
     name: mytask
 `),
 	}
-	cms := []*corev1.ConfigMap{withEnabledAlphaAPIFields(newFeatureFlagsConfigMap())}
+	cms := []*corev1.ConfigMap{newFeatureFlagsConfigMap()}
 
 	tests := []struct {
 		name                string
@@ -11929,7 +11929,7 @@ spec:
         echo -n "[\"linux\",\"mac\",\"windows\"]" | tee $(results.platforms.path)
 `)
 
-	cms := []*corev1.ConfigMap{withEnabledAlphaAPIFields(newFeatureFlagsConfigMap())}
+	cms := []*corev1.ConfigMap{newFeatureFlagsConfigMap()}
 	cms = append(cms, withMaxMatrixCombinationsCount(newDefaultsConfigMap(), 10))
 	tests := []struct {
 		name  string
@@ -12092,7 +12092,8 @@ spec:
     kind: Task
 `),
 	}
-	cms := []*corev1.ConfigMap{withEnabledAlphaAPIFields(newFeatureFlagsConfigMap())}
+
+	cms := []*corev1.ConfigMap{newFeatureFlagsConfigMap()}
 	cms = append(cms, withMaxMatrixCombinationsCount(newDefaultsConfigMap(), 10))
 
 	tests := []struct {