diff --git a/Cargo.lock b/Cargo.lock
index 8118d7a..4c8a2c2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,15 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "ansi_term"
-version = "0.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
-dependencies = [
- "winapi",
-]
+version = 4
 
 [[package]]
 name = "console"
@@ -32,14 +23,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6245d59a3e82a7fc217c5828a6692dbc6dfb63a0c8c90495621f7b9d79704a0e"
 
 [[package]]
-name = "ctor"
-version = "0.1.15"
+name = "diff"
+version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39858aa5bac06462d4dd4b9164848eb81ffc4aa5c479746393598fd193afa227"
-dependencies = [
- "quote",
- "syn",
-]
+checksum = "56254986775e3233ffa9c4d7d3faaf6d36a2c09d30b20687e9f88bc8bafc16c8"
 
 [[package]]
 name = "difference"
@@ -97,25 +84,14 @@ version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8dd5a6d5999d9907cda8ed67bbd137d3af8085216c2ac62de5be860bd41f304a"
 
-[[package]]
-name = "output_vt100"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53cdc5b785b7a58c5aad8216b3dfa114df64b0b06ae6e1501cef91df2fbdf8f9"
-dependencies = [
- "winapi",
-]
-
 [[package]]
 name = "pretty_assertions"
-version = "0.6.1"
+version = "1.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f81e1644e1b54f5a68959a29aa86cde704219254669da328ecfdf6a1f09d427"
+checksum = "3ae130e2f271fbc2ac3a40fb1d07180839cdbbe443c7a27e1e3c13c5cac0116d"
 dependencies = [
- "ansi_term",
- "ctor",
- "difference",
- "output_vt100",
+ "diff",
+ "yansi",
 ]
 
 [[package]]
@@ -301,3 +277,9 @@ checksum = "39f0c922f1a334134dc2f7a8b67dc5d25f0735263feec974345ff706bcf20b0d"
 dependencies = [
  "linked-hash-map",
 ]
+
+[[package]]
+name = "yansi"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfe53a6657fd280eaa890a3bc59152892ffa3e30101319d168b781ed6529b049"
diff --git a/safe-builder/Cargo.toml b/safe-builder/Cargo.toml
index 456842f..6e6f371 100644
--- a/safe-builder/Cargo.toml
+++ b/safe-builder/Cargo.toml
@@ -11,5 +11,5 @@ edition = "2018"
 safe-builder-derive = { version = "*", path = "../safe-builder-derive" }
 
 [dev-dependencies]
-pretty_assertions = "0.6.1"
+pretty_assertions = "1.0.0"
 insta = "0.16"