diff --git a/doc/source/modules/constants.rst b/doc/source/modules/constants.rst
index 4a63fcd7..8127590a 100644
--- a/doc/source/modules/constants.rst
+++ b/doc/source/modules/constants.rst
@@ -166,12 +166,6 @@ Namespaces
 .. data:: xmlsec.constants.XPointerNs
    :annotation: = 'http://www.w3.org/2001/04/xmldsig-more/xptr'
 
-.. data:: xmlsec.constants.Soap11Ns
-   :annotation: = 'http://schemas.xmlsoap.org/soap/envelope/'
-
-.. data:: xmlsec.constants.Soap12Ns
-   :annotation: = 'http://www.w3.org/2002/06/soap-envelope'
-
 .. data:: xmlsec.constants.NsExcC14N
    :annotation: = 'http://www.w3.org/2001/10/xml-exc-c14n#'
 
diff --git a/src/constants.c b/src/constants.c
index 34c81b29..72ae217f 100644
--- a/src/constants.c
+++ b/src/constants.c
@@ -316,8 +316,6 @@ int PyXmlSec_ConstantsModule_Init(PyObject* package) {
     PYXMLSEC_ADD_NS_CONSTANT(XPathNs, "XPATH");
     PYXMLSEC_ADD_NS_CONSTANT(XPath2Ns, "XPATH2");
     PYXMLSEC_ADD_NS_CONSTANT(XPointerNs, "XPOINTER");
-    PYXMLSEC_ADD_NS_CONSTANT(Soap11Ns, "SOAP11");
-    PYXMLSEC_ADD_NS_CONSTANT(Soap12Ns, "SOAP12");
     PYXMLSEC_ADD_NS_CONSTANT(NsExcC14N, "EXC_C14N");
     PYXMLSEC_ADD_NS_CONSTANT(NsExcC14NWithComments, "EXC_C14N_WITH_COMMENT");
 
diff --git a/src/xmlsec/constants.pyi b/src/xmlsec/constants.pyi
index 3430a027..9fd24e53 100644
--- a/src/xmlsec/constants.pyi
+++ b/src/xmlsec/constants.pyi
@@ -85,8 +85,6 @@ NodeX509Data: Final[str]
 Ns: Final[str]
 NsExcC14N: Final[str]
 NsExcC14NWithComments: Final[str]
-Soap11Ns: Final[str]
-Soap12Ns: Final[str]
 TransformAes128Cbc: Final[__Transform]
 TransformAes128Gcm: Final[__Transform]
 TransformAes192Cbc: Final[__Transform]