diff --git a/spine-cpp/spine-cpp/include/spine/ConstraintTimeline1.h b/spine-cpp/spine-cpp/include/spine/ConstraintTimeline1.h
new file mode 100644
index 000000000..dda7c9c57
--- /dev/null
+++ b/spine-cpp/spine-cpp/include/spine/ConstraintTimeline1.h
@@ -0,0 +1,52 @@
+/******************************************************************************
+ * Spine Runtimes License Agreement
+ * Last updated July 28, 2023. Replaces all prior versions.
+ *
+ * Copyright (c) 2013-2023, Esoteric Software LLC
+ *
+ * Integration of the Spine Runtimes into software or otherwise creating
+ * derivative works of the Spine Runtimes is permitted under the terms and
+ * conditions of Section 2 of the Spine Editor License Agreement:
+ * http://esotericsoftware.com/spine-editor-license
+ *
+ * Otherwise, it is permitted to integrate the Spine Runtimes into software or
+ * otherwise create derivative works of the Spine Runtimes (collectively,
+ * "Products"), provided that each user of the Products must obtain their own
+ * Spine Editor license and redistribution of the Products in any form must
+ * include this license and copyright notice.
+ *
+ * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
+ * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THE
+ * SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+#ifndef Spine_ConstraintTimeline1_h
+#define Spine_ConstraintTimeline1_h
+
+#include <spine/CurveTimeline.h>
+#include <spine/Property.h>
+
+namespace spine {
+	/// Base class for single-value constraint timelines.
+	class SP_API ConstraintTimeline1 : public CurveTimeline1 {
+		RTTI_DECL
+
+	private:
+		int _constraintIndex;
+
+	public:
+		ConstraintTimeline1(size_t frameCount, size_t bezierCount, int constraintIndex, Property property);
+
+		/// The index of the constraint in Skeleton::getConstraints() that will be changed when this timeline is applied.
+		int getConstraintIndex();
+	};
+}
+
+#endif /* Spine_ConstraintTimeline1_h */
\ No newline at end of file
diff --git a/spine-cpp/spine-cpp/include/spine/spine.h b/spine-cpp/spine-cpp/include/spine/spine.h
index 6456a67e0..a5a1f8177 100644
--- a/spine-cpp/spine-cpp/include/spine/spine.h
+++ b/spine-cpp/spine-cpp/include/spine/spine.h
@@ -51,6 +51,7 @@
 #include <spine/ColorTimeline.h>
 #include <spine/ConstraintData.h>
 #include <spine/ConstraintTimeline.h>
+#include <spine/ConstraintTimeline1.h>
 #include <spine/ContainerUtil.h>
 #include <spine/CurveTimeline.h>
 #include <spine/DeformTimeline.h>
diff --git a/spine-cpp/spine-cpp/src/spine/ConstraintTimeline1.cpp b/spine-cpp/spine-cpp/src/spine/ConstraintTimeline1.cpp
new file mode 100644
index 000000000..016412b33
--- /dev/null
+++ b/spine-cpp/spine-cpp/src/spine/ConstraintTimeline1.cpp
@@ -0,0 +1,44 @@
+/******************************************************************************
+ * Spine Runtimes License Agreement
+ * Last updated July 28, 2023. Replaces all prior versions.
+ *
+ * Copyright (c) 2013-2023, Esoteric Software LLC
+ *
+ * Integration of the Spine Runtimes into software or otherwise creating
+ * derivative works of the Spine Runtimes is permitted under the terms and
+ * conditions of Section 2 of the Spine Editor License Agreement:
+ * http://esotericsoftware.com/spine-editor-license
+ *
+ * Otherwise, it is permitted to integrate the Spine Runtimes into software or
+ * otherwise create derivative works of the Spine Runtimes (collectively,
+ * "Products"), provided that each user of the Products must obtain their own
+ * Spine Editor license and redistribution of the Products in any form must
+ * include this license and copyright notice.
+ *
+ * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
+ * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THE
+ * SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+#include <spine/ConstraintTimeline1.h>
+
+using namespace spine;
+
+RTTI_IMPL(ConstraintTimeline1, CurveTimeline1)
+
+ConstraintTimeline1::ConstraintTimeline1(size_t frameCount, size_t bezierCount, int constraintIndex, Property property)
+	: CurveTimeline1(frameCount, bezierCount), _constraintIndex(constraintIndex) {
+	PropertyId ids[] = {((PropertyId) property << 32) | constraintIndex};
+	setPropertyIds(ids, 1);
+}
+
+int ConstraintTimeline1::getConstraintIndex() {
+	return _constraintIndex;
+}
\ No newline at end of file