diff --git a/.github/workflows/verify_shared_build.yml b/.github/workflows/verify_shared_build.yml
index 2d3390539..cb54febb7 100644
--- a/.github/workflows/verify_shared_build.yml
+++ b/.github/workflows/verify_shared_build.yml
@@ -15,12 +15,10 @@ concurrency:
   cancel-in-progress: true
 
 env:
-  COINCURVE_UPSTREAM_REF: 1ad5185cd42c0636104129fcc9f6a4bf9c67cc40
   COINCURVE_IGNORE_SYSTEM_LIB: '1'
   # Only 'SHARED' is recognized, any other string means 'not SHARED'
   COINCURVE_SECP256K1_BUILD: 'SHARED'
   CIBW_ENVIRONMENT_PASS_LINUX: >
-    COINCURVE_UPSTREAM_REF
     COINCURVE_IGNORE_SYSTEM_LIB
     COINCURVE_SECP256K1_BUILD
   CIBW_PROJECT_REQUIRES_PYTHON: '>=3.8'
diff --git a/cm_vendored_library/CMakeLists.txt b/cm_vendored_library/CMakeLists.txt
index 9ee784e52..42e3b60bd 100644
--- a/cm_vendored_library/CMakeLists.txt
+++ b/cm_vendored_library/CMakeLists.txt
@@ -12,10 +12,12 @@ if (PROJECT_IGNORE_SYSTEM_LIB OR NOT VENDORED_AS_SYSTEM_LIB_FOUND)
     endif()
 
     if (NOT VENDORED_UPSTREAM_REF)
-        set(VENDORED_UPSTREAM_REF "1ad5185cd42c0636104129fcc9f6a4bf9c67cc40")
+       message(STATUS "VENDORED_UPSTREAM_REF not set, using default value.")
+       set(VENDORED_UPSTREAM_REF "1ad5185cd42c0636104129fcc9f6a4bf9c67cc40")
     endif()
 
     if (NOT VENDORED_UPSTREAM_SHA)
+        message(STATUS "VENDORED_UPSTREAM_SHA not set, using default value.")
         set(VENDORED_UPSTREAM_SHA "ba34be4319f505c5766aa80b99cfa696cbb2993bfecf7d7eb8696106c493cb8c")
     endif()