diff --git a/libafl_qemu/Cargo.toml b/libafl_qemu/Cargo.toml
index 68d4f8c07e..d1ca17d544 100644
--- a/libafl_qemu/Cargo.toml
+++ b/libafl_qemu/Cargo.toml
@@ -96,7 +96,7 @@ document-features = { version = "0.2", optional = true }
 
 [build-dependencies]
 libafl_qemu_build = { path = "./libafl_qemu_build", version = "0.12.0" }
-pyo3-build-config = { version = "0.18", optional = true }
+pyo3-build-config = { version = "0.21", optional = true }
 rustversion = "1.0"
 bindgen = "0.69"
 
diff --git a/libafl_sugar/Cargo.toml b/libafl_sugar/Cargo.toml
index 3f71d4758d..8815dd2990 100644
--- a/libafl_sugar/Cargo.toml
+++ b/libafl_sugar/Cargo.toml
@@ -45,7 +45,7 @@ ppc = ["libafl_qemu/ppc"]
 hexagon = ["libafl_qemu/hexagon"]
 
 [build-dependencies]
-pyo3-build-config = { version = "0.18", optional = true }
+pyo3-build-config = { version = "0.21", optional = true }
 
 [dependencies]
 libafl = { path = "../libafl", version = "0.12.0", features = ["adaptive_serialization"] }