diff --git a/.changeset/fresh-rice-follow.md b/.changeset/fresh-rice-follow.md
new file mode 100644
index 000000000..6accc9ddf
--- /dev/null
+++ b/.changeset/fresh-rice-follow.md
@@ -0,0 +1,5 @@
+---
+'@openzeppelin/upgrades-core': patch
+---
+
+Add Celo Sepolia network to manifest file names.
diff --git a/packages/core/src/provider.ts b/packages/core/src/provider.ts
index 7f0e910a5..2ae2ec255 100644
--- a/packages/core/src/provider.ts
+++ b/packages/core/src/provider.ts
@@ -147,6 +147,7 @@ export const networkNames: { [chainId in number]?: string } = Object.freeze({
   44787: 'celo-alfajores',
   80001: 'polygon-mumbai',
   84532: 'base-sepolia',
+  11142220: 'celo-sepolia',
   11155111: 'sepolia',
   11155420: 'op-sepolia',
 });