diff --git a/.constraints/py3.10.txt b/.constraints/py3.10.txt
index 45d91c23..d1a84608 100644
--- a/.constraints/py3.10.txt
+++ b/.constraints/py3.10.txt
@@ -3,7 +3,7 @@
 absl-py==2.1.0
 accessible-pygments==0.0.5
 alabaster==0.7.16
-ampform==0.15.3
+ampform==0.15.1
 anyio==4.3.0
 argon2-cffi==23.1.0
 argon2-cffi-bindings==21.2.0
diff --git a/.constraints/py3.11.txt b/.constraints/py3.11.txt
index 856bdcbb..bc21fcce 100644
--- a/.constraints/py3.11.txt
+++ b/.constraints/py3.11.txt
@@ -3,7 +3,7 @@
 absl-py==2.1.0
 accessible-pygments==0.0.5
 alabaster==0.7.16
-ampform==0.15.3
+ampform==0.15.1
 anyio==4.3.0
 argon2-cffi==23.1.0
 argon2-cffi-bindings==21.2.0
diff --git a/.constraints/py3.12.txt b/.constraints/py3.12.txt
index c5d58763..b7c7a7fc 100644
--- a/.constraints/py3.12.txt
+++ b/.constraints/py3.12.txt
@@ -3,7 +3,7 @@
 absl-py==2.1.0
 accessible-pygments==0.0.5
 alabaster==0.7.16
-ampform==0.15.3
+ampform==0.15.1
 anyio==4.3.0
 argon2-cffi==23.1.0
 argon2-cffi-bindings==21.2.0
diff --git a/.constraints/py3.8.txt b/.constraints/py3.8.txt
index dc62b24a..9b9d34c4 100644
--- a/.constraints/py3.8.txt
+++ b/.constraints/py3.8.txt
@@ -3,7 +3,7 @@
 absl-py==2.1.0
 accessible-pygments==0.0.4
 alabaster==0.7.13
-ampform==0.15.3
+ampform==0.15.1
 anyio==4.3.0
 argon2-cffi==23.1.0
 argon2-cffi-bindings==21.2.0
diff --git a/.constraints/py3.9.txt b/.constraints/py3.9.txt
index d41bd3d3..7e3b5e2e 100644
--- a/.constraints/py3.9.txt
+++ b/.constraints/py3.9.txt
@@ -3,7 +3,7 @@
 absl-py==2.1.0
 accessible-pygments==0.0.5
 alabaster==0.7.16
-ampform==0.15.3
+ampform==0.15.1
 anyio==4.3.0
 argon2-cffi==23.1.0
 argon2-cffi-bindings==21.2.0