diff --git a/.github/workflows/valgrind.yml b/.github/workflows/valgrind.yml
new file mode 100644
index 000000000..9067b5cd0
--- /dev/null
+++ b/.github/workflows/valgrind.yml
@@ -0,0 +1,57 @@
+name: Valgrind
+on:
+  workflow_dispatch:
+  release:
+    types: [created]
+  push:
+    branches:
+      - rc-v*
+  pull_request:
+    paths:
+      - src/*.[hc]pp
+
+concurrency:
+  # Group by workflow and ref; the last component ensures that for pull
+  # requests, we limit to 1 concurrent job, but for the main branch we don't
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.ref != 'refs/heads/main' || github.run_number }}
+  # Only cancel intermediate pull request builds
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
+jobs:
+  test-valgrind:
+    name: "Ubuntu / GAP stable-4.15 / valgrind"
+    runs-on: ubuntu-latest
+    env:
+      NO_COVERAGE: true
+      VALGRIND: valgrind --trace-children=yes --leak-check=full --error-exitcode=1
+    steps:
+      - uses: actions/checkout@v5
+      - name: "Output g++ version . . ."
+        run: g++ --version
+      - name: "Install Valgrind . . ."
+        run: sudo apt-get install valgrind
+      - name: "Install GAP . . ."
+        uses: gap-actions/setup-gap@v3
+        with:
+          gap-version: stable-4.15
+          configflags: --enable-valgrind
+      - name: "Build additional necessary GAP packages . . ."
+        run: |
+          cd ${GAPROOT}/pkg
+          ../bin/BuildPackages.sh --strict digraphs* io* orb* datastructures* profiling*
+      - name: "Build Semigroups . . ."
+        uses: gap-actions/build-pkg@v2
+        with:
+          CONFIGFLAGS: --disable-hpcombi
+      - name: "Run SemigroupsTestInstall . . ."
+        uses: gap-actions/run-pkg-tests@v4
+        with:
+          testfile: tst/github_actions/install.g
+          pre-gap: ${{ env.VALGRIND }}
+          coverage: false
+      - name: "Run SemigroupsTestStandard . . ."
+        uses: gap-actions/run-pkg-tests@v4
+        with:
+          testfile: tst/github_actions/standard.g
+          pre-gap: ${{ env.VALGRIND }}
+          coverage: false
diff --git a/src/bipart.cpp b/src/bipart.cpp
index dd6504154..68c0640f1 100644
--- a/src/bipart.cpp
+++ b/src/bipart.cpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2016 James D. Mitchell
+// Copyright (C) 2016-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/bipart.hpp b/src/bipart.hpp
index 44a52236a..9b0e69b3a 100644
--- a/src/bipart.hpp
+++ b/src/bipart.hpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2016 James D. Mitchell
+// Copyright (C) 2016-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/cong.cpp b/src/cong.cpp
index 62cada6e5..4b11bc825 100644
--- a/src/cong.cpp
+++ b/src/cong.cpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2021 James D. Mitchell
+// Copyright (C) 2021-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/cong.hpp b/src/cong.hpp
index ce6cd4cc3..ad084a8ff 100644
--- a/src/cong.hpp
+++ b/src/cong.hpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2021 James D. Mitchell
+// Copyright (C) 2021-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/conglatt.cpp b/src/conglatt.cpp
index 6752f0303..cb4f0c00a 100644
--- a/src/conglatt.cpp
+++ b/src/conglatt.cpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2022 James D. Mitchell
+// Copyright (C) 2022-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/conglatt.hpp b/src/conglatt.hpp
index 4614c27df..83fa65399 100644
--- a/src/conglatt.hpp
+++ b/src/conglatt.hpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2022 James D. Mitchell
+// Copyright (C) 20222-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/froidure-pin-base.cpp b/src/froidure-pin-base.cpp
index 1e01da412..0ed0cf26a 100644
--- a/src/froidure-pin-base.cpp
+++ b/src/froidure-pin-base.cpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2022 James D. Mitchell
+// Copyright (C) 2022-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/froidure-pin-bipart.cpp b/src/froidure-pin-bipart.cpp
index 96e340927..985cb4133 100644
--- a/src/froidure-pin-bipart.cpp
+++ b/src/froidure-pin-bipart.cpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2021 James D. Mitchell
+// Copyright (C) 2021-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/froidure-pin-bmat.cpp b/src/froidure-pin-bmat.cpp
index 941dda818..505fcdc82 100644
--- a/src/froidure-pin-bmat.cpp
+++ b/src/froidure-pin-bmat.cpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2021 James D. Mitchell
+// Copyright (C) 2021-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/froidure-pin-fallback.cpp b/src/froidure-pin-fallback.cpp
index d61965562..7b27c8852 100644
--- a/src/froidure-pin-fallback.cpp
+++ b/src/froidure-pin-fallback.cpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2016-2022 James D. Mitchell
+// Copyright (C) 2016-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/froidure-pin-fallback.hpp b/src/froidure-pin-fallback.hpp
index 8981f5f99..3f1df13bf 100644
--- a/src/froidure-pin-fallback.hpp
+++ b/src/froidure-pin-fallback.hpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2016-2022 James D. Mitchell
+// Copyright (C) 2016-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/froidure-pin-matrix.cpp b/src/froidure-pin-matrix.cpp
index e3e5ba089..2ad8cef2d 100644
--- a/src/froidure-pin-matrix.cpp
+++ b/src/froidure-pin-matrix.cpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2021 James D. Mitchell
+// Copyright (C) 2021-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/froidure-pin-max-plus-mat.cpp b/src/froidure-pin-max-plus-mat.cpp
index 59732a2aa..c445b1444 100644
--- a/src/froidure-pin-max-plus-mat.cpp
+++ b/src/froidure-pin-max-plus-mat.cpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2021 James D. Mitchell
+// Copyright (C) 2021-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/froidure-pin-min-plus-mat.cpp b/src/froidure-pin-min-plus-mat.cpp
index 70fd8cf26..3ca156aae 100644
--- a/src/froidure-pin-min-plus-mat.cpp
+++ b/src/froidure-pin-min-plus-mat.cpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2021 James D. Mitchell
+// Copyright (C) 2021-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/froidure-pin-pbr.cpp b/src/froidure-pin-pbr.cpp
index 71f0ad8d2..6439523e4 100644
--- a/src/froidure-pin-pbr.cpp
+++ b/src/froidure-pin-pbr.cpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2021 James D. Mitchell
+// Copyright (C) 2021-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/froidure-pin-pperm.cpp b/src/froidure-pin-pperm.cpp
index 3e8390dc5..8817be96a 100644
--- a/src/froidure-pin-pperm.cpp
+++ b/src/froidure-pin-pperm.cpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2021 James D. Mitchell
+// Copyright (C) 2021-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/froidure-pin-transf.cpp b/src/froidure-pin-transf.cpp
index 7293385c5..c5f65b84a 100644
--- a/src/froidure-pin-transf.cpp
+++ b/src/froidure-pin-transf.cpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2021 James D. Mitchell
+// Copyright (C) 2021-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/froidure-pin.hpp b/src/froidure-pin.hpp
index d77c1bcec..e73add7f2 100644
--- a/src/froidure-pin.hpp
+++ b/src/froidure-pin.hpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2021 James D. Mitchell
+// Copyright (C) 2021-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/pkg.hpp b/src/pkg.hpp
index ae469533f..5a2998666 100644
--- a/src/pkg.hpp
+++ b/src/pkg.hpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2016-2022 James D. Mitchell
+// Copyright (C) 2016-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/semigroups-debug.hpp b/src/semigroups-debug.hpp
index 9fb89deca..aec2217ba 100644
--- a/src/semigroups-debug.hpp
+++ b/src/semigroups-debug.hpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2017 James D. Mitchell
+// Copyright (C) 2017-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/to_cpp.hpp b/src/to_cpp.hpp
index 55bfac79b..38cda3309 100644
--- a/src/to_cpp.hpp
+++ b/src/to_cpp.hpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2020-2022 James D. Mitchell
+// Copyright (C) 2020-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/to_gap.cpp b/src/to_gap.cpp
index 62bfe89be..1737c74cd 100644
--- a/src/to_gap.cpp
+++ b/src/to_gap.cpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2021 James D. Mitchell
+// Copyright (C) 2021-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/src/to_gap.hpp b/src/to_gap.hpp
index 6206b5910..acfa56f07 100644
--- a/src/to_gap.hpp
+++ b/src/to_gap.hpp
@@ -1,6 +1,6 @@
 //
 // Semigroups package for GAP
-// Copyright (C) 2020-2022 James D. Mitchell
+// Copyright (C) 2020-2025 James D. Mitchell
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
diff --git a/tst/github_actions/examples.g b/tst/github_actions/examples.g
new file mode 100644
index 000000000..7f2d5ba66
--- /dev/null
+++ b/tst/github_actions/examples.g
@@ -0,0 +1,7 @@
+LoadPackage("semigroups", false);;
+if SEMIGROUPS.TestManualExamples() then
+  QUIT_GAP(0);
+else
+  QUIT_GAP(1);
+fi;
+FORCE_QUIT_GAP(1);
diff --git a/tst/github_actions/extreme.g b/tst/github_actions/extreme.g
new file mode 100644
index 000000000..b2ea88290
--- /dev/null
+++ b/tst/github_actions/extreme.g
@@ -0,0 +1,7 @@
+LoadPackage("semigroups", false);;
+if SemigroupsTestExtreme(rec(earlyStop := false)) then
+  QUIT_GAP(0);
+else
+  QUIT_GAP(1);
+fi;
+FORCE_QUIT_GAP(1);
diff --git a/tst/github_actions/install.g b/tst/github_actions/install.g
new file mode 100644
index 000000000..7456be72d
--- /dev/null
+++ b/tst/github_actions/install.g
@@ -0,0 +1,7 @@
+LoadPackage("semigroups", false);;
+if SemigroupsTestInstall() then
+  QUIT_GAP(0);
+else
+  QUIT_GAP(1);
+fi;
+FORCE_QUIT_GAP(1);
diff --git a/tst/github_actions/standard.g b/tst/github_actions/standard.g
new file mode 100644
index 000000000..ab13b5d1d
--- /dev/null
+++ b/tst/github_actions/standard.g
@@ -0,0 +1,7 @@
+LoadPackage("semigroups", false);;
+if SemigroupsTestStandard(rec(earlyStop := false)) then
+  QUIT_GAP(0);
+else
+  QUIT_GAP(1);
+fi;
+FORCE_QUIT_GAP(1);