diff --git a/reverie/Cargo.toml b/reverie/Cargo.toml
index a366e9b..b8788cd 100644
--- a/reverie/Cargo.toml
+++ b/reverie/Cargo.toml
@@ -12,7 +12,7 @@ license = "BSD-2-Clause"
 addr2line = "0.21"
 anyhow = "1.0.75"
 async-trait = "0.1.71"
-bitflags = "2.4"
+bitflags = { version = "2.4", features = ["serde"] }
 byteorder = "1.3"
 lazy_static = "1.4"
 libc = "0.2.139"
diff --git a/safeptrace/Cargo.toml b/safeptrace/Cargo.toml
index 8c1b0c1..6b62445 100644
--- a/safeptrace/Cargo.toml
+++ b/safeptrace/Cargo.toml
@@ -9,7 +9,7 @@ repository = "https://github.com/facebookexperimental/reverie"
 license = "BSD-2-Clause"
 
 [dependencies]
-bitflags = "2.4"
+bitflags = { version = "2.4", features = ["serde"] }
 futures = { version = "0.3.28", features = ["async-await", "compat"] }
 lazy_static = "1.4"
 libc = "0.2.139"