diff --git a/.constraints/py3.10.txt b/.constraints/py3.10.txt
index 735692ea..83b23e60 100644
--- a/.constraints/py3.10.txt
+++ b/.constraints/py3.10.txt
@@ -7,7 +7,7 @@
 absl-py==2.0.0
 accessible-pygments==0.0.4
 alabaster==0.7.16
-ampform==0.14.8
+ampform==0.14.7
 anyio==4.2.0
 argon2-cffi==23.1.0
 argon2-cffi-bindings==21.2.0
diff --git a/.constraints/py3.11.txt b/.constraints/py3.11.txt
index 34933a28..2eac3592 100644
--- a/.constraints/py3.11.txt
+++ b/.constraints/py3.11.txt
@@ -7,7 +7,7 @@
 absl-py==2.0.0
 accessible-pygments==0.0.4
 alabaster==0.7.16
-ampform==0.14.8
+ampform==0.14.7
 anyio==4.2.0
 argon2-cffi==23.1.0
 argon2-cffi-bindings==21.2.0
diff --git a/.constraints/py3.8.txt b/.constraints/py3.8.txt
index 554054a2..cb0f8049 100644
--- a/.constraints/py3.8.txt
+++ b/.constraints/py3.8.txt
@@ -7,7 +7,7 @@
 absl-py==2.0.0
 accessible-pygments==0.0.4
 alabaster==0.7.13
-ampform==0.14.8
+ampform==0.14.7
 anyio==4.2.0
 argon2-cffi==23.1.0
 argon2-cffi-bindings==21.2.0
diff --git a/.constraints/py3.9.txt b/.constraints/py3.9.txt
index c82f7aca..753da1cf 100644
--- a/.constraints/py3.9.txt
+++ b/.constraints/py3.9.txt
@@ -7,7 +7,7 @@
 absl-py==2.0.0
 accessible-pygments==0.0.4
 alabaster==0.7.16
-ampform==0.14.8
+ampform==0.14.7
 anyio==4.2.0
 argon2-cffi==23.1.0
 argon2-cffi-bindings==21.2.0
diff --git a/pyproject.toml b/pyproject.toml
index d3d9ac3f..f9cdfd66 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -144,6 +144,7 @@ tensorflow = [
     "tensorwaves[tf]",
 ]
 test = [
+    "ampform !=0.14.8", # https://github.com/ComPWA/ampform/issues/208
     "ampform >=0.13", # https://github.com/ComPWA/ampform/issues/208
     "nbmake",
     "pytest-benchmark",