diff --git a/rust/flatbuffers/Cargo.toml b/rust/flatbuffers/Cargo.toml
index 5f154c55edd..306e6c4ce4f 100644
--- a/rust/flatbuffers/Cargo.toml
+++ b/rust/flatbuffers/Cargo.toml
@@ -17,7 +17,7 @@ std = []
 serialize = ["serde"]
 
 [dependencies]
-bitflags = "2.6.0"
+bitflags = "1.2.1"
 serde = { version = "1.0", optional = true }
 
 [build-dependencies]
diff --git a/rust/flexbuffers/Cargo.toml b/rust/flexbuffers/Cargo.toml
index 0c00e124c01..b3544676be0 100644
--- a/rust/flexbuffers/Cargo.toml
+++ b/rust/flexbuffers/Cargo.toml
@@ -24,5 +24,5 @@ deserialize_human_readable = []
 serde = "1.0.119"
 serde_derive = "1.0.119"
 byteorder = "1.4.2"
-num_enum = "0.7.3"
-bitflags = "2.6.0"
+num_enum = "0.5.1"
+bitflags = "1.2.1"