diff --git a/Cargo.toml b/Cargo.toml
index 4c0b1500..dc26dcc2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -54,7 +54,7 @@ proptest = "1.0.0"
 zcash_note_encryption = { version = "0.1", features = ["pre-zip-212"] }
 
 [target.'cfg(unix)'.dev-dependencies]
-pprof = { version = "=0.6.1", features = ["criterion", "flamegraph"] }
+pprof = { version = "0.8", features = ["criterion", "flamegraph"] } # MSRV 1.56
 
 [lib]
 bench = false