diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 753d4b3..adbf265 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -157,7 +157,7 @@ jobs:
         run: |
           mkdir -p priv/plts
           mix deps.get
-          # mix dialyzer --plt
+          mix dialyzer --plt
 
       - run: mix deps.get
       - run: mix clean && mix deep_clean
@@ -165,4 +165,4 @@ jobs:
       - run: mix deps.unlock --check-unused
       - run: mix format --check-formatted
       - run: mix credo --strict
-      # - run: mix dialyzer --plt
+      - run: mix dialyzer --plt
diff --git a/lib/vix/operator.ex b/lib/vix/operator.ex
index 0128a5f..c94eb20 100644
--- a/lib/vix/operator.ex
+++ b/lib/vix/operator.ex
@@ -164,7 +164,7 @@ defmodule Vix.Operator do
 
       image?(a) && is_list(b) ->
         when_number_list b do
-          Operation.linear!(a, [1], b)
+          Operation.linear!(a, [1.0], b)
         end
 
       true ->
@@ -189,7 +189,7 @@ defmodule Vix.Operator do
 
       image?(a) && is_list(b) ->
         when_number_list b do
-          Operation.linear!(a, b, [0])
+          Operation.linear!(a, b, [+0.0])
         end
 
       true ->
@@ -212,12 +212,12 @@ defmodule Vix.Operator do
       is_list(a) && image?(b) ->
         when_number_list a do
           # a - b = (b * -1) + a
-          Operation.linear!(b, [-1], a)
+          Operation.linear!(b, [-1.0], a)
         end
 
       image?(a) && is_list(b) ->
         when_number_list b do
-          Operation.linear!(a, [1], Enum.map(b, &(-&1)))
+          Operation.linear!(a, [1.0], Enum.map(b, &(-&1)))
         end
 
       true ->
@@ -241,13 +241,13 @@ defmodule Vix.Operator do
         when_number_list a do
           # a / b = (b^-1) * a = (1 / b) * a
           b
-          |> Operation.math2_const!(:VIPS_OPERATION_MATH2_POW, [-1])
-          |> Operation.linear!(a, [0])
+          |> Operation.math2_const!(:VIPS_OPERATION_MATH2_POW, [-1.0])
+          |> Operation.linear!(a, [+0.0])
         end
 
       image?(a) && is_list(b) ->
         when_number_list b do
-          Operation.linear!(a, Enum.map(b, &(1 / &1)), [0])
+          Operation.linear!(a, Enum.map(b, &(1 / &1)), [+0.0])
         end
 
       true ->
diff --git a/lib/vix/vips/image.ex b/lib/vix/vips/image.ex
index ef5ce56..6d0cd56 100644
--- a/lib/vix/vips/image.ex
+++ b/lib/vix/vips/image.ex
@@ -197,7 +197,7 @@ defmodule Vix.Vips.Image do
   end
 
   @impl Access
-  def pop(_image, _band, _default \\ nil) do
+  def pop(_image, _band) do
     raise ArgumentError, "pop/3 for Vix.Vips.Image is not supported."
   end
 
@@ -818,7 +818,7 @@ defmodule Vix.Vips.Image do
     end
   end
 
-  @spec write_area_to_binary(t(), params :: keyword) :: {:ok, binary()} | {:error, term()}
+  @spec write_area_to_binary(t(), params :: keyword) :: {:ok, map} | {:error, term()}
   defp write_area_to_binary(%Image{ref: vips_image}, params \\ []) do
     params =
       Enum.map(~w(left top width height band_start band_count)a, fn key ->
@@ -1040,7 +1040,7 @@ defmodule Vix.Vips.Image do
         "xoffset" => quote(do: integer()),
         "yoffset" => quote(do: integer()),
         "filename" => quote(do: String.t()),
-        "mode" => quote(do: Stringt.t()),
+        "mode" => quote(do: String.t()),
         "scale" => quote(do: float()),
         "offset" => quote(do: float()),
         "page-height" => quote(do: integer()),
@@ -1048,7 +1048,7 @@ defmodule Vix.Vips.Image do
         "orientation" => quote(do: integer()),
         "interpretation" => quote(do: Vix.Vips.Operation.vips_interpretation()),
         "coding" => quote(do: Vix.Vips.Operation.vips_coding()),
-        "format" => quote(do: Vix.Vips.Operatoin.vips_band_format())
+        "format" => quote(do: Vix.Vips.Operation.vips_band_format())
       } do
     func_name = name |> String.replace("-", "_") |> String.to_atom()
 
@@ -1085,7 +1085,7 @@ defmodule Vix.Vips.Image do
           xoffset: integer() | nil,
           yoffset: integer() | nil,
           filename: String.t() | nil,
-          mode: Stringt.t() | nil,
+          mode: String.t() | nil,
           scale: float() | nil,
           offset: float() | nil,
           "page-height": integer() | nil,
@@ -1093,7 +1093,7 @@ defmodule Vix.Vips.Image do
           orientation: integer() | nil,
           interpretation: Vix.Vips.Operation.vips_interpretation() | nil,
           coding: Vix.Vips.Operation.vips_coding() | nil,
-          format: Vix.Vips.Operatoin.vips_band_format() | nil
+          format: Vix.Vips.Operation.vips_band_format() | nil
         }
   def headers(image) do
     [
@@ -1158,7 +1158,8 @@ defmodule Vix.Vips.Image do
   end
 
   @spec validate_matrix_list([[number]] | [number] | Range.t()) ::
-          {width :: non_neg_integer(), height :: non_neg_integer(), [number]}
+          {:ok, {width :: non_neg_integer(), height :: non_neg_integer(), [number]}}
+          | {:error, term}
   defp validate_matrix_list(list) do
     list = normalize_list(list)
 
diff --git a/lib/vix/vips/mutable_operation.ex b/lib/vix/vips/mutable_operation.ex
index 7ab0c79..e9edcc4 100644
--- a/lib/vix/vips/mutable_operation.ex
+++ b/lib/vix/vips/mutable_operation.ex
@@ -97,6 +97,7 @@ defmodule Vix.Vips.MutableOperation do
             )
           )
     if in_opt_spec == [] do
+      @dialyzer {:no_match, [{bang_func_name, length(req_params)}]}
       # operations without optional arguments
       def unquote(bang_func_name)(unquote_splicing(req_params)) do
         case __MODULE__.unquote(func_name)(unquote_splicing(req_params)) do
@@ -107,6 +108,7 @@ defmodule Vix.Vips.MutableOperation do
         end
       end
     else
+      @dialyzer {:no_match, [{bang_func_name, length(req_params) + 1}]}
       # operations with optional arguments
       def unquote(bang_func_name)(unquote_splicing(req_params), optional \\ []) do
         case __MODULE__.unquote(func_name)(unquote_splicing(req_params), optional) do
diff --git a/lib/vix/vips/operation.ex b/lib/vix/vips/operation.ex
index 740ebe1..268ce5b 100644
--- a/lib/vix/vips/operation.ex
+++ b/lib/vix/vips/operation.ex
@@ -77,6 +77,7 @@ defmodule Vix.Vips.Operation do
             )
           )
     if in_opt_spec == [] do
+      @dialyzer {:no_match, [{bang_func_name, length(req_params)}]}
       # operations without optional arguments
       def unquote(bang_func_name)(unquote_splicing(req_params)) do
         case __MODULE__.unquote(func_name)(unquote_splicing(req_params)) do
@@ -87,6 +88,7 @@ defmodule Vix.Vips.Operation do
         end
       end
     else
+      @dialyzer {:no_match, [{bang_func_name, length(req_params) + 1}]}
       # operations with optional arguments
       def unquote(bang_func_name)(unquote_splicing(req_params), optional \\ []) do
         case __MODULE__.unquote(func_name)(unquote_splicing(req_params), optional) do