diff --git a/.github/elixir-test-matrix.json b/.github/elixir-test-matrix.json
index 50d30258..b47d542f 100644
--- a/.github/elixir-test-matrix.json
+++ b/.github/elixir-test-matrix.json
@@ -9,8 +9,7 @@
     "1.15.4",
     "1.14.4",
     "1.13.4",
-    "1.12.3",
-    "1.11.4"
+    "1.12.3"
   ],
   "rebar3_version": [
     "3.20.0"
@@ -45,14 +44,6 @@
     {
       "elixir_version": "1.12.3",
       "otp_version": "26.0.2"
-    },
-    {
-      "elixir_version": "1.11.4",
-      "otp_version": "25.3.2.5"
-    },
-    {
-      "elixir_version": "1.11.4",
-      "otp_version": "26.0.2"
     }
   ]
 }
diff --git a/.github/workflows/elixir.yml b/.github/workflows/elixir.yml
index 35932d3e..23d67a0f 100644
--- a/.github/workflows/elixir.yml
+++ b/.github/workflows/elixir.yml
@@ -487,6 +487,29 @@ jobs:
         if: matrix.check_formatted
       - name: Test
         run: mix test
+      - name: Restore PLT cache
+        id: plt_cache
+        uses: actions/cache/restore@v3
+        with:
+          key: |
+            plt-${{ runner.os }}-${{ matrix.otp-version }}-${{ matrix.elixir-version }}-${{ hashFiles('**/mix.lock') }}
+          restore_keys: |
+            plt-${{ runner.os }}-${{ matrix.otp-version }}-${{ matrix.elixir-version }}-
+          path: |
+            priv/plts
+      - name: Create PLTs
+        if: steps.plt_cache.outputs.cache-hit != 'true'
+        run: mix dialyzer --plt
+      - name: Save PLT cache
+        id: plt_cache_save
+        uses: actions/cache/save@v3
+        with:
+          key: |
+            plt-${{ runner.os }}-${{ matrix.otp-version }}-${{ matrix.elixir-version }}-${{ hashFiles('**/mix.lock') }}
+          path: |
+            priv/plts
+      - name: Run dialyzer
+        run: mix dialyzer --format github
 
   opentelemetry-tesla:
     needs: [test-matrix]
diff --git a/propagators/opentelemetry_process_propagator/.gitignore b/propagators/opentelemetry_process_propagator/.gitignore
index 0b24e2be..7247319f 100644
--- a/propagators/opentelemetry_process_propagator/.gitignore
+++ b/propagators/opentelemetry_process_propagator/.gitignore
@@ -19,3 +19,5 @@ rebar3.crashdump
 *~
 doc
 edoc
+/priv/plts/opentelemetry_process_propagator.plt
+/priv/plts/opentelemetry_process_propagator.plt.hash
diff --git a/propagators/opentelemetry_process_propagator/mix.exs b/propagators/opentelemetry_process_propagator/mix.exs
index 97ea0a1b..2eb9d32d 100644
--- a/propagators/opentelemetry_process_propagator/mix.exs
+++ b/propagators/opentelemetry_process_propagator/mix.exs
@@ -9,7 +9,7 @@ defmodule OpentelemetryProcessPropagator.MixProject do
       app: app,
       version: to_string(Keyword.fetch!(desc, :vsn)),
       description: to_string(Keyword.fetch!(desc, :description)),
-      elixir: "~> 1.11",
+      elixir: "~> 1.12",
       start_permanent: Mix.env() == :prod,
       deps: deps(Keyword.fetch!(config, :deps)),
       name: "Opentelemetry Process Propagator",
@@ -26,6 +26,7 @@ defmodule OpentelemetryProcessPropagator.MixProject do
         # when build docs first build edocs with rebar3
         docs: ["cmd rebar3 edoc", "docs"]
       ],
+      plt_file: {:no_warn, "priv/plts/opentelemetry_process_propagator.plt"},
       package: package()
     ]
   end
@@ -44,7 +45,7 @@ defmodule OpentelemetryProcessPropagator.MixProject do
       dep when is_atom(dep) -> {dep, ">= 0.0.0"}
     end)
     |> Enum.concat([
-      {:dialyxir, "~> 1.1", only: [:dev, :test], runtime: false},
+      {:dialyxir, "~> 1.4", only: [:dev, :test], runtime: false},
       {:ex_doc, "~> 0.29", only: :dev, runtime: false},
       {:opentelemetry, "~> 1.0", only: [:dev, :test]},
       {:opentelemetry_exporter, "~> 1.0", only: [:dev, :test]}
diff --git a/propagators/opentelemetry_process_propagator/mix.lock b/propagators/opentelemetry_process_propagator/mix.lock
index cb433f3f..60e4e380 100644
--- a/propagators/opentelemetry_process_propagator/mix.lock
+++ b/propagators/opentelemetry_process_propagator/mix.lock
@@ -2,7 +2,7 @@
   "acceptor_pool": {:hex, :acceptor_pool, "1.0.0", "43c20d2acae35f0c2bcd64f9d2bde267e459f0f3fd23dab26485bf518c281b21", [:rebar3], [], "hexpm", "0cbcd83fdc8b9ad2eee2067ef8b91a14858a5883cb7cd800e6fcd5803e158788"},
   "chatterbox": {:hex, :ts_chatterbox, "0.13.0", "6f059d97bcaa758b8ea6fffe2b3b81362bd06b639d3ea2bb088335511d691ebf", [:rebar3], [{:hpack, "~>0.2.3", [hex: :hpack_erl, repo: "hexpm", optional: false]}], "hexpm", "b93d19104d86af0b3f2566c4cba2a57d2e06d103728246ba1ac6c3c0ff010aa7"},
   "ctx": {:hex, :ctx, "0.6.0", "8ff88b70e6400c4df90142e7f130625b82086077a45364a78d208ed3ed53c7fe", [:rebar3], [], "hexpm", "a14ed2d1b67723dbebbe423b28d7615eb0bdcba6ff28f2d1f1b0a7e1d4aa5fc2"},
-  "dialyxir": {:hex, :dialyxir, "1.2.0", "58344b3e87c2e7095304c81a9ae65cb68b613e28340690dfe1a5597fd08dec37", [:mix], [{:erlex, ">= 0.2.6", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm", "61072136427a851674cab81762be4dbeae7679f85b1272b6d25c3a839aff8463"},
+  "dialyxir": {:hex, :dialyxir, "1.4.1", "a22ed1e7bd3a3e3f197b68d806ef66acb61ee8f57b3ac85fc5d57354c5482a93", [:mix], [{:erlex, ">= 0.2.6", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm", "84b795d6d7796297cca5a3118444b80c7d94f7ce247d49886e7c291e1ae49801"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.29", "149d50dcb3a93d9f3d6f3ecf18c918fb5a2d3c001b5d3305c926cddfbd33355b", [:mix], [], "hexpm", "4902af1b3eb139016aed210888748db8070b8125c2342ce3dcae4f38dcc63503"},
   "erlex": {:hex, :erlex, "0.2.6", "c7987d15e899c7a2f34f5420d2a2ea0d659682c06ac607572df55a43753aa12e", [:mix], [], "hexpm", "2ed2e25711feb44d52b17d2780eabf998452f6efda104877a3881c2f8c0c0c75"},
   "ex_doc": {:hex, :ex_doc, "0.29.0", "4a1cb903ce746aceef9c1f9ae8a6c12b742a5461e6959b9d3b24d813ffbea146", [:mix], [{:earmark_parser, "~> 1.4.19", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.14", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1", [hex: :makeup_erlang, repo: "hexpm", optional: false]}], "hexpm", "f096adb8bbca677d35d278223361c7792d496b3fc0d0224c9d4bc2f651af5db1"},