diff --git a/.github/workflows/erlang.yml b/.github/workflows/erlang.yml
index 8d76c7d..c11fdb5 100644
--- a/.github/workflows/erlang.yml
+++ b/.github/workflows/erlang.yml
@@ -2,9 +2,10 @@ name: Erlang CI
 
 on:
   push:
-    branches: [ develop-3.0 ]
+    branches: [ develop ]
   pull_request:
-    branches: [ develop-3.0 ]
+    branches: [ develop ]
+
 
 jobs:
 
@@ -12,12 +13,23 @@ jobs:
 
     runs-on: ubuntu-latest
 
+    strategy:
+      fail-fast: false
+      matrix:
+        otp:
+          - "25.1"
+          - "24.3"
+          - "22.3"
+
     container:
-      image: erlang:22.3.3
+      image: erlang:${{ matrix.otp }}
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Compile
-      run: rebar3 compile
-    - name: Run tests
-      run: rebar3 do xref, dialyzer, eunit
+      - uses: lukka/get-cmake@latest
+      - uses: actions/checkout@v2
+      - name: Compile
+        run: ./rebar3 compile
+      - name: Run xref and dialyzer
+        run: ./rebar3 do xref, dialyzer
+      - name: Run eunit
+        run: ./rebar3 as gha do eunit
diff --git a/.thumbs.yml b/.thumbs.yml
deleted file mode 100644
index 24f8fea..0000000
--- a/.thumbs.yml
+++ /dev/null
@@ -1,17 +0,0 @@
-minimum_reviewers: 2
-merge: true
-merge_method: merge
-build_steps:
-  # clean relevant profiles to ensure they succeed
-  - rebar3 clean --all
-  - rebar3 as test clean --all
-  # compile relevant profiles to ensure they succeed
-  - rebar3 compile
-  - rebar3 as test compile
-  # these are the real tests
-  - rebar3 eunit
-  - rebar3 dialyzer
-  # last, but not least, do the docs build?
-  - rebar3 edoc
-org_mode: true
-timeout: 1800
diff --git a/rebar.config b/rebar.config
index d7c8a87..b04df49 100644
--- a/rebar.config
+++ b/rebar.config
@@ -1,3 +1,4 @@
+{minimum_otp_vsn, "22.0"}.
 {erl_opts, [
 	   debug_info,
 	   warnings_as_errors,
@@ -10,3 +11,6 @@
 	   ]}.
 {xref_checks, [undefined_function_calls, deprecated_function_calls]}.
 {eunit_opts, [verbose]}.
+{profiles, [
+    {gha, [{erl_opts, [{d, 'GITHUBEXCLUDE'}]}]}
+]}.
diff --git a/rebar3 b/rebar3
index f0b1ba7..a83d554 100755
Binary files a/rebar3 and b/rebar3 differ