diff --git a/.formatter.exs b/.formatter.exs
index 5e3e3db0..a474ce35 100644
--- a/.formatter.exs
+++ b/.formatter.exs
@@ -4,5 +4,6 @@
   locals_without_parens: [field: 2, field: 3, oneof: 2, extend: 4, extensions: 1],
   export: [
     locals_without_parens: [field: 2, field: 3, oneof: 2, extend: 4, extensions: 1]
-  ]
+  ],
+  import_deps: [:stream_data]
 ]
diff --git a/README.md b/README.md
index c08eeba7..e2e5cbe5 100644
--- a/README.md
+++ b/README.md
@@ -149,10 +149,8 @@ More options will be added in the future, see elixirpb.proto comments for detail
 
 ## Tests
 
-Before you can run the test suite, you must install `eqc_gen`:
-
-```
-$ mix eqc.install --mini
+```bash
+mix test
 ```
 
 ## Sponsors
diff --git a/mix.exs b/mix.exs
index 541b9830..0f124daa 100644
--- a/mix.exs
+++ b/mix.exs
@@ -35,7 +35,7 @@ defmodule Protobuf.Mixfile do
       {:dialyxir, "~> 1.0", only: [:dev, :test], runtime: false},
       {:credo, "~> 1.5", only: [:dev, :test], runtime: false},
       {:ex_doc, "~> 0.23", only: :dev, runtime: false},
-      {:eqc_ex, github: "tony612/eqc_ex", branch: "fix-elixir-1-10", only: [:dev, :test]}
+      {:stream_data, "~> 0.5.0", only: [:dev, :test]}
     ]
   end
 
diff --git a/mix.lock b/mix.lock
index 9f98b66a..87b7ad0b 100644
--- a/mix.lock
+++ b/mix.lock
@@ -2,9 +2,7 @@
   "bunt": {:hex, :bunt, "0.2.0", "951c6e801e8b1d2cbe58ebbd3e616a869061ddadcc4863d0a2182541acae9a38", [:mix], [], "hexpm", "7af5c7e09fe1d40f76c8e4f9dd2be7cebd83909f31fee7cd0e9eadc567da8353"},
   "credo": {:hex, :credo, "1.5.1", "4fe303cc828412b9d21eed4eab60914c401e71f117f40243266aafb66f30d036", [:mix], [{:bunt, "~> 0.2.0", [hex: :bunt, repo: "hexpm", optional: false]}, {:file_system, "~> 0.2.8", [hex: :file_system, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "0b219ca4dcc89e4e7bc6ae7e6539c313e738e192e10b85275fa1e82b5203ecd7"},
   "dialyxir": {:hex, :dialyxir, "1.0.0", "6a1fa629f7881a9f5aaf3a78f094b2a51a0357c843871b8bc98824e7342d00a5", [:mix], [{:erlex, ">= 0.2.6", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm", "aeb06588145fac14ca08d8061a142d52753dbc2cf7f0d00fc1013f53f8654654"},
-  "earmark": {:hex, :earmark, "1.4.5", "62ffd3bd7722fb7a7b1ecd2419ea0b458c356e7168c1f5d65caf09b4fbdd13c8", [:mix], [], "hexpm", "b7d0e6263d83dc27141a523467799a685965bf8b13b6743413f19a7079843f4f"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.10", "6603d7a603b9c18d3d20db69921527f82ef09990885ed7525003c7fe7dc86c56", [:mix], [], "hexpm", "8e2d5370b732385db2c9b22215c3f59c84ac7dda7ed7e544d7c459496ae519c0"},
-  "eqc_ex": {:git, "https://github.com/tony612/eqc_ex.git", "43759ba1fa56dec40b0346f2e23268d18f3ccda1", [branch: "fix-elixir-1-10"]},
   "erlex": {:hex, :erlex, "0.2.6", "c7987d15e899c7a2f34f5420d2a2ea0d659682c06ac607572df55a43753aa12e", [:mix], [], "hexpm", "2ed2e25711feb44d52b17d2780eabf998452f6efda104877a3881c2f8c0c0c75"},
   "ex_doc": {:hex, :ex_doc, "0.23.0", "a069bc9b0bf8efe323ecde8c0d62afc13d308b1fa3d228b65bca5cf8703a529d", [:mix], [{:earmark_parser, "~> 1.4.0", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.14", [hex: :makeup_elixir, repo: "hexpm", optional: false]}], "hexpm", "f5e2c4702468b2fd11b10d39416ddadd2fcdd173ba2a0285ebd92c39827a5a16"},
   "file_system": {:hex, :file_system, "0.2.9", "545b9c9d502e8bfa71a5315fac2a923bd060fd9acb797fe6595f54b0f975fd32", [:mix], [], "hexpm", "3cf87a377fe1d93043adeec4889feacf594957226b4f19d5897096d6f61345d8"},
@@ -12,4 +10,5 @@
   "makeup": {:hex, :makeup, "1.0.5", "d5a830bc42c9800ce07dd97fa94669dfb93d3bf5fcf6ea7a0c67b2e0e4a7f26c", [:mix], [{:nimble_parsec, "~> 0.5 or ~> 1.0", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "cfa158c02d3f5c0c665d0af11512fed3fba0144cf1aadee0f2ce17747fba2ca9"},
   "makeup_elixir": {:hex, :makeup_elixir, "0.15.0", "98312c9f0d3730fde4049985a1105da5155bfe5c11e47bdc7406d88e01e4219b", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.1", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "75ffa34ab1056b7e24844c90bfc62aaf6f3a37a15faa76b07bc5eba27e4a8b4a"},
   "nimble_parsec": {:hex, :nimble_parsec, "1.1.0", "3a6fca1550363552e54c216debb6a9e95bd8d32348938e13de5eda962c0d7f89", [:mix], [], "hexpm", "08eb32d66b706e913ff748f11694b17981c0b04a33ef470e33e11b3d3ac8f54b"},
+  "stream_data": {:hex, :stream_data, "0.5.0", "b27641e58941685c75b353577dc602c9d2c12292dd84babf506c2033cd97893e", [:mix], [], "hexpm", "012bd2eec069ada4db3411f9115ccafa38540a3c78c4c0349f151fc761b9e271"},
 }
diff --git a/test/pbt/encode_decode_type_test.exs b/test/pbt/encode_decode_type_test.exs
index c01e660a..3bde730e 100644
--- a/test/pbt/encode_decode_type_test.exs
+++ b/test/pbt/encode_decode_type_test.exs
@@ -12,18 +12,10 @@ defmodule Protobuf.EncodeDecodeTypeTest.PropertyGenerator do
   defmacro make_property(gen_func, field_type, wire_type) do
     quote do
       property unquote(Atom.to_string(field_type)) <> " roundtrip" do
-        forall n <- unquote(gen_func) do
+        check all n <- unquote(gen_func) do
           iodata = Encoder.encode_type(unquote(field_type), n)
           bin = IO.iodata_to_binary(iodata)
-
-          ensure(
-            n ==
-              decode_type(
-                unquote(wire_type),
-                unquote(field_type),
-                bin
-              )
-          )
+          assert n == decode_type(unquote(wire_type), unquote(field_type), bin)
         end
       end
     end
@@ -35,7 +27,7 @@ defmodule Protobuf.EncodeDecodeTypeTest.PropertyGenerator do
   defmacro make_canonical_property(gen_func, field_type, wire_type) do
     quote do
       property unquote(Atom.to_string(field_type)) <> " canonical roundtrip" do
-        forall n <- unquote(gen_func) do
+        check all n <- unquote(gen_func) do
           encoded_val =
             unquote(field_type)
             |> Encoder.encode_type(n)
@@ -53,14 +45,7 @@ defmodule Protobuf.EncodeDecodeTypeTest.PropertyGenerator do
             |> Encoder.encode_type(canonical_val)
             |> IO.iodata_to_binary()
 
-          ensure(
-            canonical_val ==
-              decode_type(
-                unquote(wire_type),
-                unquote(field_type),
-                bin
-              )
-          )
+          assert canonical_val == decode_type(unquote(wire_type), unquote(field_type), bin)
         end
       end
     end
@@ -68,30 +53,39 @@ defmodule Protobuf.EncodeDecodeTypeTest.PropertyGenerator do
 end
 
 defmodule Protobuf.EncodeDecodeTypeTest do
-  use ExUnit.Case
-  use EQC.ExUnit
+  use ExUnit.Case, async: true
+  use ExUnitProperties
 
   import Protobuf.EncodeDecodeTypeTest.PropertyGenerator
 
   defp uint32_gen do
-    let(<<x::unsigned-integer-size(32)>> <- binary(4), do: return(x))
+    map(binary(length: 4), fn <<x::unsigned-integer-size(32)>> -> x end)
   end
 
   defp uint64_gen do
-    let(<<x::unsigned-integer-size(64)>> <- binary(8), do: return(x))
+    map(binary(length: 8), fn <<x::unsigned-integer-size(64)>> -> x end)
+  end
+
+  defp large_integer do
+    scale(integer(), &(&1 * 10_000))
   end
 
-  make_property(int(), :int32, 0)
-  make_property(largeint(), :int64, 0)
+  defp natural_number do
+    map(integer(), &abs/1)
+  end
+
+  make_property(integer(), :int32, 0)
+  make_property(large_integer(), :int64, 0)
   make_property(uint32_gen(), :uint32, 0)
   make_property(uint64_gen(), :uint64, 0)
-  make_property(int(), :sint32, 0)
-  make_property(largeint(), :sint64, 0)
-  make_property(bool(), :bool, 0)
+  make_property(integer(), :sint32, 0)
+  make_property(large_integer(), :sint64, 0)
+
+  make_property(boolean(), :bool, 0)
 
-  make_property(nat(), :fixed64, 1)
-  make_property(largeint(), :sfixed64, 1)
-  make_canonical_property(resize(64, real()), :double, 1)
+  make_property(natural_number(), :fixed64, 1)
+  make_property(large_integer(), :sfixed64, 1)
 
-  make_canonical_property(resize(32, real()), :float, 5)
+  make_canonical_property(float(), :double, 1)
+  make_canonical_property(float(), :float, 5)
 end
diff --git a/test/pbt/encode_decode_varint_test.exs b/test/pbt/encode_decode_varint_test.exs
index 8043a76c..ed04d048 100644
--- a/test/pbt/encode_decode_varint_test.exs
+++ b/test/pbt/encode_decode_varint_test.exs
@@ -1,25 +1,27 @@
 defmodule Protobuf.EncodeDecodeVarintTest do
-  use ExUnit.Case
-  use EQC.ExUnit
+  use ExUnit.Case, async: true
+  use ExUnitProperties
 
   alias Protobuf.{Encoder, Decoder}
 
   property "varint roundtrip" do
-    forall n <- largeint() do
+    check all n <- large_integer_gen() do
       iodata = Encoder.encode_varint(n)
       bin = IO.iodata_to_binary(iodata)
       [n] = Decoder.decode_varint(bin, :value)
-      ensure(<<n::signed-64>> == <<n::64>>)
+      assert <<n::signed-64>> == <<n::64>>
     end
   end
 
-  defp neg_gen do
-    let(x <- largeint(), do: return(-abs(x)))
-  end
-
   property "encode_varint for negative integers should always be 10 bytes" do
-    forall n <- neg_gen() do
-      ensure(IO.iodata_length(Encoder.encode_varint(n)) == 10)
+    negative_large_integer_gen = map(large_integer_gen(), &(-abs(&1)))
+
+    check all n <- negative_large_integer_gen do
+      assert IO.iodata_length(Encoder.encode_varint(n)) == 10
     end
   end
+
+  defp large_integer_gen do
+    scale(integer(), &(&1 * 10_000))
+  end
 end