diff --git a/Cargo.lock b/Cargo.lock
index a2c0acb7e..5c727167d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -485,7 +485,7 @@ checksum = "7ffc5c5338469d4d3ea17d269fa8ea3512ad247247c30bd2df69e68309ed0a08"
 
 [[package]]
 name = "mbedtls"
-version = "0.9.3"
+version = "0.12.0"
 dependencies = [
  "async-stream",
  "bit-vec",
diff --git a/mbedtls/Cargo.toml b/mbedtls/Cargo.toml
index a7d2d2c96..2a2b36f53 100644
--- a/mbedtls/Cargo.toml
+++ b/mbedtls/Cargo.toml
@@ -1,6 +1,8 @@
 [package]
 name = "mbedtls"
-version = "0.9.3"
+# We jumped from v0.9 to v0.12 because v0.10 and v0.11 were based on mbedtls 3.X, which
+# we decided not to support.
+version = "0.12.0"
 authors = ["Jethro Beekman <jethro@fortanix.com>"]
 build = "build.rs"
 edition = "2018"