diff --git a/src/univers/version_range.py b/src/univers/version_range.py
index 69f84f24..ba2eee42 100644
--- a/src/univers/version_range.py
+++ b/src/univers/version_range.py
@@ -842,8 +842,11 @@ class NugetVersionRange(MavenVersionRange):
 
 
 class ComposerVersionRange(VersionRange):
-    # TODO composer may need its own scheme see https//github.com/aboutcode-org/univers/issues/5
-    # and https//getcomposer.org/doc/articles/versions.md
+    """
+    Composer version range as documented at
+    https://getcomposer.org/doc/articles/versions.md
+    """
+
     scheme = "composer"
     version_class = versions.ComposerVersion
 
@@ -856,6 +859,99 @@ class ComposerVersionRange(VersionRange):
         "=": "=",  # This is not a native composer-semver comparator, but is used in the gitlab version range for composer packages.
     }
 
+    @classmethod
+    def from_native(cls, string):
+        """
+        Parse a Composer version range string into a version range object.
+        """
+        string = string.strip()
+        string = string.replace("|", "||")
+        string = string.replace(".x", ".*")
+
+        if "-" in string:
+            start, end = map(str.strip, string.split("-"))
+            start_parts = (start + ".0.0").split(".")[:3]
+            end_parts = (end + ".0.0").split(".")[:3]
+
+            if len(end.split(".")) < 3:
+                major = int(end_parts[0])
+                minor = int(end_parts[1])
+                upper_constraint = VersionConstraint(
+                    comparator="<", version=cls.version_class(f"{major}.{minor + 1}.0")
+                )
+            else:
+                upper_constraint = VersionConstraint(
+                    comparator="<=", version=cls.version_class(".".join(end_parts))
+                )
+
+            lower_constraint = VersionConstraint(
+                comparator=">=", version=cls.version_class(".".join(start_parts))
+            )
+
+            return cls(constraints=[lower_constraint, upper_constraint])
+
+        if string.startswith("^"):
+            base_version = string[1:]
+            base_version_obj = cls.version_class(base_version)
+            base_parts = base_version.split(".")
+            if base_parts[0] == "0":
+                upper_constraint = VersionConstraint(
+                    comparator="<", version=cls.version_class(f"0.{int(base_parts[1]) + 1}.0")
+                )
+            else:
+                upper_constraint = VersionConstraint(
+                    comparator="<", version=cls.version_class(f"{int(base_parts[0]) + 1}.0.0")
+                )
+            lower_constraint = VersionConstraint(comparator=">=", version=base_version_obj)
+            return cls(constraints=[lower_constraint, upper_constraint])
+
+        if string.startswith("~"):
+            base_version = string[1:]
+            base_version_obj = cls.version_class(base_version)
+            base_parts = base_version.split(".")
+
+            if len(base_parts) == 3:
+                upper_constraint = VersionConstraint(
+                    comparator="<",
+                    version=cls.version_class(f"{base_parts[0]}.{int(base_parts[1]) + 1}.0"),
+                )
+            else:
+                upper_constraint = VersionConstraint(
+                    comparator="<", version=cls.version_class(f"{int(base_parts[0]) + 1}.0.0")
+                )
+
+            lower_constraint = VersionConstraint(comparator=">=", version=base_version_obj)
+            return cls(constraints=[lower_constraint, upper_constraint])
+
+        if ".*" in string:
+            base_version = string.replace(".*", ".0")
+            base_version_obj = cls.version_class(base_version)
+            base_parts = base_version.split(".")
+            upper_constraint = VersionConstraint(
+                comparator="<",
+                version=cls.version_class(f"{base_parts[0]}.{int(base_parts[1]) + 1}.0"),
+            )
+            lower_constraint = VersionConstraint(comparator=">=", version=base_version_obj)
+            return cls(constraints=[lower_constraint, upper_constraint])
+
+        constraints = []
+
+        segments = string.split("||")
+
+        for segment in segments:
+            if not any(op in string for op in cls.vers_by_native_comparators):
+                segment = "==" + segment
+            specifiers = SpecifierSet(segment)
+            for spec in specifiers:
+                operator = spec.operator
+                version = spec.version
+                version = cls.version_class(version)
+                comparator = cls.vers_by_native_comparators.get(operator, "=")
+                constraint = VersionConstraint(comparator=comparator, version=version)
+                constraints.append(constraint)
+
+        return cls(constraints=constraints)
+
 
 class RpmVersionRange(VersionRange):
     # http://ftp.rpm.org/api/4.4.2.2/dependencies.html
@@ -942,7 +1038,7 @@ def from_natives(cls, strings):
 
 class GolangVersionRange(VersionRange):
     """
-    Go modules use strict semver with pseudo numbering for Git repos
+    Go modules use strict semver with pseudo numbering for Git commits.
     https://go.dev/doc/modules/version-numbers
     """
 
@@ -958,6 +1054,39 @@ class GolangVersionRange(VersionRange):
         "=": "=",  # This is not a native golang-semver comparator, but is used in the gitlab version range for go packages.
     }
 
+    @classmethod
+    def from_native(cls, string):
+        """
+        Parse a native GoLang version range into a set of constraints.
+        """
+        constraints = []
+
+        segments = string.split("||")
+        for segment in segments:
+
+            if not any(op in string for op in cls.vers_by_native_comparators):
+                segment = "==" + segment
+
+            specifiers = SpecifierSet(segment)
+            for spec in specifiers:
+                operator = spec.operator
+                version = spec.version
+                version = cls.version_class(version)
+                comparator = cls.vers_by_native_comparators.get(operator, "=")
+                constraint = VersionConstraint(comparator=comparator, version=version)
+                constraints.append(constraint)
+
+        return cls(constraints=constraints)
+
+    @classmethod
+    def from_natives(cls, strings):
+        if isinstance(strings, str):
+            return cls.from_native(strings)
+        constraints = []
+        for rel in strings:
+            constraints.extend(cls.from_native(rel).constraints)
+        return cls(constraints=constraints)
+
 
 class GenericVersionRange(VersionRange):
     scheme = "generic"
diff --git a/tests/test_composer_version_range.py b/tests/test_composer_version_range.py
new file mode 100644
index 00000000..208dd8fb
--- /dev/null
+++ b/tests/test_composer_version_range.py
@@ -0,0 +1,152 @@
+# Copyright (c) nexB Inc. and others.
+# SPDX-License-Identifier: Apache-2.0
+#
+# Visit https://aboutcode.org and https://github.com/aboutcode-org/univers for support and download.
+
+from univers.version_constraint import VersionConstraint
+from univers.version_range import ComposerVersionRange
+from univers.versions import ComposerVersion
+
+
+def test_composer_exact_version():
+    version_range = ComposerVersionRange.from_native("1.3.2")
+    assert version_range == ComposerVersionRange(
+        constraints=(VersionConstraint(comparator="=", version=ComposerVersion(string="1.3.2")),)
+    )
+
+
+def test_composer_greater_than_or_equal():
+    version_range = ComposerVersionRange.from_native(">=1.3.2")
+    assert version_range == ComposerVersionRange(
+        constraints=(VersionConstraint(comparator=">=", version=ComposerVersion(string="1.3.2")),)
+    )
+
+
+def test_composer_less_than():
+    version_range = ComposerVersionRange.from_native("<1.3.2")
+    assert version_range == ComposerVersionRange(
+        constraints=(VersionConstraint(comparator="<", version=ComposerVersion(string="1.3.2")),)
+    )
+
+
+def test_composer_wildcard():
+    version_range = ComposerVersionRange.from_native("1.3.*")
+    assert version_range == ComposerVersionRange(
+        constraints=(
+            VersionConstraint(comparator=">=", version=ComposerVersion(string="1.3.0")),
+            VersionConstraint(comparator="<", version=ComposerVersion(string="1.4.0")),
+        )
+    )
+
+
+def test_composer_tilde_patch():
+    version_range = ComposerVersionRange.from_native("~1.3.2")
+    assert version_range == ComposerVersionRange(
+        constraints=(
+            VersionConstraint(comparator=">=", version=ComposerVersion(string="1.3.2")),
+            VersionConstraint(comparator="<", version=ComposerVersion(string="1.4.0")),
+        )
+    )
+
+
+def test_composer_tilde_minor():
+    version_range = ComposerVersionRange.from_native("~1.3")
+    assert version_range == ComposerVersionRange(
+        constraints=(
+            VersionConstraint(comparator=">=", version=ComposerVersion(string="1.3.0")),
+            VersionConstraint(comparator="<", version=ComposerVersion(string="2.0.0")),
+        )
+    )
+
+
+def test_composer_caret_patch():
+    version_range = ComposerVersionRange.from_native("^1.3.2")
+    assert version_range == ComposerVersionRange(
+        constraints=(
+            VersionConstraint(comparator=">=", version=ComposerVersion(string="1.3.2")),
+            VersionConstraint(comparator="<", version=ComposerVersion(string="2.0.0")),
+        )
+    )
+
+
+def test_composer_caret_zero_minor():
+    version_range = ComposerVersionRange.from_native("^0.3.2")
+    assert version_range == ComposerVersionRange(
+        constraints=(
+            VersionConstraint(comparator=">=", version=ComposerVersion(string="0.3.2")),
+            VersionConstraint(comparator="<", version=ComposerVersion(string="0.4.0")),
+        )
+    )
+
+
+def test_composer_range_with_multiple_constraints():
+    version_range = ComposerVersionRange.from_native(">=1.2.3, <2.0.0")
+    assert version_range == ComposerVersionRange(
+        constraints=(
+            VersionConstraint(comparator=">=", version=ComposerVersion(string="1.2.3")),
+            VersionConstraint(comparator="<", version=ComposerVersion(string="2.0.0")),
+        )
+    )
+
+
+def test_composer_range_with_or_constraints():
+    version_range = ComposerVersionRange.from_native(">=1.0.0 || <2.0.0")
+    assert version_range == ComposerVersionRange(
+        constraints=(
+            VersionConstraint(comparator=">=", version=ComposerVersion(string="1.0.0")),
+            VersionConstraint(comparator="<", version=ComposerVersion(string="2.0.0")),
+        )
+    )
+
+
+def test_composer_invalid_syntax():
+    try:
+        ComposerVersionRange.from_native(">1.0.0 <2.0.0")
+        assert False, "Should have raised a ValueError"
+    except ValueError:
+        assert True
+
+
+def test_composer_range_str_representation():
+    version_range = ComposerVersionRange.from_native(">=1.0.0, <2.0.0")
+    assert str(version_range) == "vers:composer/>=1.0.0|<2.0.0"
+
+
+def test_composer_legacy_pipe():
+    version_range = ComposerVersionRange.from_native(">=1.0.0 | <2.0.0")
+    assert version_range == ComposerVersionRange(
+        constraints=(
+            VersionConstraint(comparator=">=", version=ComposerVersion(string="1.0.0")),
+            VersionConstraint(comparator="<", version=ComposerVersion(string="2.0.0")),
+        )
+    )
+
+
+def test_composer_hyphen_partial_range():
+    version_range = ComposerVersionRange.from_native("1.0 - 2.0")
+    assert version_range == ComposerVersionRange(
+        constraints=(
+            VersionConstraint(comparator=">=", version=ComposerVersion(string="1.0.0")),
+            VersionConstraint(comparator="<", version=ComposerVersion(string="2.1")),
+        )
+    )
+
+
+def test_composer_hyphen_full_range():
+    version_range = ComposerVersionRange.from_native("1.0.0 - 2.1.0")
+    assert version_range == ComposerVersionRange(
+        constraints=(
+            VersionConstraint(comparator=">=", version=ComposerVersion(string="1.0.0")),
+            VersionConstraint(comparator="<=", version=ComposerVersion(string="2.1.0")),
+        )
+    )
+
+
+def test_composer_x_wildcard():
+    version_range = ComposerVersionRange.from_native("1.5.x")
+    assert version_range == ComposerVersionRange(
+        constraints=(
+            VersionConstraint(comparator=">=", version=ComposerVersion(string="1.5.0")),
+            VersionConstraint(comparator="<", version=ComposerVersion(string="1.6.0")),
+        )
+    )
diff --git a/tests/test_golang_version_range.py b/tests/test_golang_version_range.py
new file mode 100644
index 00000000..53c0401c
--- /dev/null
+++ b/tests/test_golang_version_range.py
@@ -0,0 +1,99 @@
+# Copyright (c) nexB Inc. and others.
+# SPDX-License-Identifier: Apache-2.0
+#
+# Visit https://aboutcode.org and https://github.com/aboutcode-org/univers for support and download.
+
+from univers.version_constraint import VersionConstraint
+from univers.version_range import GolangVersionRange
+from univers.versions import GolangVersion
+
+
+def test_golang_exact_version():
+    version_range = GolangVersionRange.from_native("v1.2.3")
+    assert version_range == GolangVersionRange(
+        constraints=(VersionConstraint(comparator="=", version=GolangVersion(string="v1.2.3")),)
+    )
+
+
+def test_golang_greater_than():
+    version_range = GolangVersionRange.from_native(">v1.2.3")
+    assert version_range == GolangVersionRange(
+        constraints=(VersionConstraint(comparator=">", version=GolangVersion(string="v1.2.3")),)
+    )
+
+
+def test_golang_greater_than_or_equal():
+    version_range = GolangVersionRange.from_native(">=v1.2.3")
+    assert version_range == GolangVersionRange(
+        constraints=(VersionConstraint(comparator=">=", version=GolangVersion(string="v1.2.3")),)
+    )
+
+
+def test_golang_less_than():
+    version_range = GolangVersionRange.from_native("<v1.2.3")
+    assert version_range == GolangVersionRange(
+        constraints=(VersionConstraint(comparator="<", version=GolangVersion(string="v1.2.3")),)
+    )
+
+
+def test_golang_less_than_or_equal():
+    version_range = GolangVersionRange.from_native("<=v1.2.3")
+    assert version_range == GolangVersionRange(
+        constraints=(VersionConstraint(comparator="<=", version=GolangVersion(string="v1.2.3")),)
+    )
+
+
+def test_golang_version_range_with_multiple_constraints():
+    version_range = GolangVersionRange.from_native(">=v1.2.3, <v2.0.0")
+    assert version_range == GolangVersionRange(
+        constraints=(
+            VersionConstraint(comparator=">=", version=GolangVersion(string="v1.2.3")),
+            VersionConstraint(comparator="<", version=GolangVersion(string="v2.0.0")),
+        )
+    )
+
+
+def test_golang_version_with_prerelease():
+    version_range = GolangVersionRange.from_native("v1.2.3-beta.1")
+    assert version_range == GolangVersionRange(
+        constraints=(
+            VersionConstraint(comparator="=", version=GolangVersion(string="v1.2.3-beta.1")),
+        )
+    )
+
+
+def test_golang_range_string_representation():
+    version_range = GolangVersionRange.from_native(">=v1.2.3, <v2.0.0")
+    assert str(version_range) == "vers:golang/>=1.2.3|<2.0.0"
+
+
+def test_golang_version_range_with_pre_and_build():
+    version_range = GolangVersionRange.from_native("v1.2.3-alpha+build123")
+    assert version_range == GolangVersionRange(
+        constraints=(
+            VersionConstraint(
+                comparator="=", version=GolangVersion(string="v1.2.3-alpha+build123")
+            ),
+        )
+    )
+
+
+def test_golang_version_with_major_zero():
+    version_range = GolangVersionRange.from_native("v0.1.5")
+    assert version_range == GolangVersionRange(
+        constraints=(VersionConstraint(comparator="=", version=GolangVersion(string="v0.1.5")),)
+    )
+
+
+def test_golang_version_with_only_major():
+    version_range = GolangVersionRange.from_native("v1")
+    assert version_range == GolangVersionRange(
+        constraints=(VersionConstraint(comparator="=", version=GolangVersion(string="v1")),)
+    )
+
+
+def test_golang_version_with_upper_case():
+    version_range = GolangVersionRange.from_native("V1.2.3")
+    assert version_range == GolangVersionRange(
+        constraints=(VersionConstraint(comparator="=", version=GolangVersion(string="v1.2.3")),)
+    )