diff --git a/.gitmodules b/.gitmodules
index 00e4df6..bf5a072 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "spec"]
 	path = spec
-	url = https://github.com/Entrolution/codex-file-format-spec.git
+	url = https://github.com/Entrolution/cdx-file-format-spec.git
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 9f9dacd..554c2a2 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -142,7 +142,7 @@ src/
 
 ## Specification Reference
 
-This library implements the [CDX Document Format Specification](https://github.com/Entrolution/codex-file-format-spec). When implementing new features:
+This library implements the [CDX Document Format Specification](https://github.com/Entrolution/cdx-file-format-spec). When implementing new features:
 
 - Reference the relevant spec section
 - Note any deviations or extensions
diff --git a/README.md b/README.md
index 5979b4a..259147e 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 
 # cdx-core
 
-Core Rust library for reading, writing, and validating [CDX Document Format](https://github.com/Entrolution/codex-file-format-spec) (`.cdx`) files.
+Core Rust library for reading, writing, and validating [CDX Document Format](https://github.com/Entrolution/cdx-file-format-spec) (`.cdx`) files.
 
 ## Overview
 
@@ -161,7 +161,7 @@ cargo run --example open_and_verify path/to/document.cdx
 
 ## Specification Compliance
 
-This library implements the [CDX Document Format Specification v0.1](https://github.com/Entrolution/codex-file-format-spec).
+This library implements the [CDX Document Format Specification v0.1](https://github.com/Entrolution/cdx-file-format-spec).
 
 ### Module Status
 
diff --git a/docs/conformance-matrix.md b/docs/conformance-matrix.md
index 7a40d5b..b9f5444 100644
--- a/docs/conformance-matrix.md
+++ b/docs/conformance-matrix.md
@@ -1,6 +1,6 @@
 # CDX Specification Conformance Matrix
 
-This document maps requirements from the [CDX File Format Specification](../codex-file-format-spec/) to test coverage in cdx-core.
+This document maps requirements from the [CDX File Format Specification](../cdx-file-format-spec/) to test coverage in cdx-core.
 
 ## Legend