diff --git a/fil-proofs-tooling/Cargo.toml b/fil-proofs-tooling/Cargo.toml
index 8c1f393aa..f57ddf85e 100644
--- a/fil-proofs-tooling/Cargo.toml
+++ b/fil-proofs-tooling/Cargo.toml
@@ -25,7 +25,7 @@ chrono = { version = "0.4.7", features = ["serde"] }
 memmap = "0.7.0"
 bellperson = "0.8.0"
 paired = "0.19.0"
-fil-sapling-crypto = "0.6.0"
+fil-sapling-crypto = "=0.6.0"
 rand = "0.7"
 storage-proofs = { path = "../storage-proofs"}
 filecoin-proofs = { path = "../filecoin-proofs"}
diff --git a/filecoin-proofs/Cargo.toml b/filecoin-proofs/Cargo.toml
index 0cd6d6432..5673e0285 100644
--- a/filecoin-proofs/Cargo.toml
+++ b/filecoin-proofs/Cargo.toml
@@ -27,7 +27,7 @@ ff = { version = "0.2.1", package = "fff" }
 blake2b_simd = "0.5"
 bellperson = "0.8.0"
 paired = "0.19.0"
-fil-sapling-crypto = "0.6.0"
+fil-sapling-crypto = "=0.6.0"
 clap = "2"
 log = "0.4.7"
 fil_logger = "0.1"
@@ -48,7 +48,7 @@ sha2 = { version = "0.8.3", package = "sha2ni" }
 typenum = "1.11.2"
 bitintr = "0.3.0"
 gperftools = { version = "0.2", optional = true }
-phase2 = { package = "phase21", version = "0.6.0" }
+phase2 = { package = "phase21", version = "=0.6.1" }
 simplelog = "0.7.4"
 rand_chacha = "0.2.1"
 dialoguer = "0.6.2"
diff --git a/storage-proofs/core/Cargo.toml b/storage-proofs/core/Cargo.toml
index 0f1f06fc9..6587bd5e0 100644
--- a/storage-proofs/core/Cargo.toml
+++ b/storage-proofs/core/Cargo.toml
@@ -32,7 +32,7 @@ toml = "0.5"
 ff = { version = "0.2.1", package = "fff" }
 bellperson = "0.8.0"
 paired = { version = "0.19.0", features = ["serde"] }
-fil-sapling-crypto = "0.6.0"
+fil-sapling-crypto = "=0.6.0"
 serde_json = "1.0"
 log = "0.4.7"
 rand_chacha = "0.2.1"
@@ -40,7 +40,7 @@ hex = "0.4.0"
 generic-array = "0.13.2"
 anyhow = "1.0.23"
 thiserror = "1.0.6"
-neptune = { version = "1.0.1", features = ["gpu"] }
+neptune = { version = "=1.0.1", features = ["gpu"] }
 cpu-time = { version = "1.0", optional = true }
 gperftools = { version = "0.2", optional = true }
 
diff --git a/storage-proofs/porep/Cargo.toml b/storage-proofs/porep/Cargo.toml
index d011322bb..ad80d8830 100644
--- a/storage-proofs/porep/Cargo.toml
+++ b/storage-proofs/porep/Cargo.toml
@@ -22,13 +22,13 @@ serde = { version = "1.0", features = ["derive"]}
 ff = { version = "0.2.1", package = "fff" }
 bellperson = "0.8.0"
 paired = { version = "0.19.0", features = ["serde"] }
-fil-sapling-crypto = "0.6.0"
+fil-sapling-crypto = "=0.6.0"
 log = "0.4.7"
 pretty_assertions = "0.6.1"
 generic-array = "0.13.2"
 anyhow = "1.0.23"
 once_cell = "1.3.1"
-neptune = { version = "1.0.1", features = ["gpu"] }
+neptune = { version = "=1.0.1", features = ["gpu"] }
 num_cpus = "1.10.1"
 
 [dev-dependencies]
diff --git a/storage-proofs/post/Cargo.toml b/storage-proofs/post/Cargo.toml
index 048557144..434541c1f 100644
--- a/storage-proofs/post/Cargo.toml
+++ b/storage-proofs/post/Cargo.toml
@@ -21,12 +21,12 @@ blake2s_simd = "0.5"
 ff = { version = "0.2.1", package = "fff" }
 bellperson = "0.8.0"
 paired = { version = "0.19.0", features = ["serde"] }
-fil-sapling-crypto = "0.6.0"
+fil-sapling-crypto = "=0.6.0"
 log = "0.4.7"
 hex = "0.4.0"
 generic-array = "0.13.2"
 anyhow = "1.0.23"
-neptune = { version = "1.0.1", features = ["gpu"] }
+neptune = { version = "=1.0.1", features = ["gpu"] }
 
 [dev-dependencies]
 tempdir = "0.3.7"