diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c708f361..74179ab5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,7 +9,7 @@ on:
 # Remember to update me in package-set.yml as well
 env:
   vessel_version: "v0.7.0"
-  moc_version: "0.12.1"
+  moc_version: "0.13.0"
 
 jobs:
   tests:
diff --git a/.github/workflows/package-set.yml b/.github/workflows/package-set.yml
index cb5cde29..c1effca0 100644
--- a/.github/workflows/package-set.yml
+++ b/.github/workflows/package-set.yml
@@ -8,7 +8,7 @@ on:
 
 env:
   vessel_version: "v0.7.0"
-  moc_version: "0.12.1"
+  moc_version: "0.13.0"
 
 jobs:
   verify:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ac59047a..eff519fc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.13.0
+
+(nothing)
+
 ## 0.12.1
 
 * Add `Iter.concat` function (thanks to AndyGura) (#650).
diff --git a/mops.toml b/mops.toml
index e508c7f6..e8088789 100644
--- a/mops.toml
+++ b/mops.toml
@@ -1,6 +1,6 @@
 [package]
 name = "base"
-version = "0.12.1"
+version = "0.13.0"
 description = "The Motoko base library"
 repository = "https://github.com/dfinity/motoko-base"
 keywords = [ "base" ]
@@ -10,5 +10,5 @@ license = "Apache-2.0"
 matchers = "https://github.com/kritzcreek/motoko-matchers#v1.3.0@3dac8a071b69e4e651b25a7d9683fe831eb7cffd"
 
 [toolchain]
-moc = "0.12.1"
+moc = "0.13.0"
 wasmtime = "17.0.0"