diff --git a/contrib/pyln-testing/pyproject.toml b/contrib/pyln-testing/pyproject.toml
index e942e5e0a0a1..ff2808d621cd 100644
--- a/contrib/pyln-testing/pyproject.toml
+++ b/contrib/pyln-testing/pyproject.toml
@@ -17,6 +17,7 @@ dependencies = [
   "cheroot>=8,<=10",
   "psutil>=5.9.0",
   "requests>=2.32.0",
+  "mnemonic>=0.21",
 ]
 
 [dependency-groups]
diff --git a/pyproject.toml b/pyproject.toml
index 76335c2e5d71..b86ffef59cdc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,6 @@ dependencies = [
   "pytest-rerunfailures>=16.0.1",
   "pyln-testing",
   "pyln-proto",
-  "mnemonic>=0.21",
 ]
 package-mode = false
 [dependency-groups]
diff --git a/uv.lock b/uv.lock
index 0c75e49f7605..18721b935c47 100644
--- a/uv.lock
+++ b/uv.lock
@@ -460,7 +460,6 @@ dependencies = [
     { name = "grpcio" },
     { name = "grpcio-tools" },
     { name = "mako" },
-    { name = "mnemonic" },
     { name = "protobuf" },
     { name = "pyln-client" },
     { name = "pyln-grpc-proto" },
@@ -502,7 +501,6 @@ requires-dist = [
     { name = "grpcio", specifier = "==1.75.1" },
     { name = "grpcio-tools", specifier = "==1.75.1" },
     { name = "mako", specifier = ">=1.1.6" },
-    { name = "mnemonic", specifier = ">=0.21" },
     { name = "protobuf", specifier = "==6.32.1" },
     { name = "pyln-client", editable = "contrib/pyln-client" },
     { name = "pyln-grpc-proto", editable = "contrib/pyln-grpc-proto" },
@@ -1719,6 +1717,7 @@ dependencies = [
     { name = "ephemeral-port-reserve" },
     { name = "flask" },
     { name = "jsonschema" },
+    { name = "mnemonic" },
     { name = "psutil" },
     { name = "psycopg2-binary" },
     { name = "pyln-client" },
@@ -1747,6 +1746,7 @@ requires-dist = [
     { name = "flask", specifier = ">=3.0.0" },
     { name = "grpcio", marker = "extra == 'grpc'", specifier = ">=1.75.0" },
     { name = "jsonschema", specifier = ">=4.4.0" },
+    { name = "mnemonic", specifier = ">=0.21" },
     { name = "psutil", specifier = ">=5.9.0" },
     { name = "psycopg2-binary", specifier = ">=2.9.0" },
     { name = "pyln-client", editable = "contrib/pyln-client" },