diff --git a/automation/greetings.yml b/automation/greetings.yml
index 28ee6b2..ebb00a0 100644
--- a/automation/greetings.yml
+++ b/automation/greetings.yml
@@ -9,5 +9,5 @@ jobs:
     - uses: actions/first-interaction@v1
       with:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
-        issue-message: 'Message that will be displayed on users'' first issue'
-        pr-message: 'Message that will be displayed on users'' first pr'
+        issue-message: 'Message that will be displayed on users first issue'
+        pr-message: 'Message that will be displayed on users first pull request'
diff --git a/ci/cmake.yml b/ci/cmake.yml
index d251d2e..1634140 100644
--- a/ci/cmake.yml
+++ b/ci/cmake.yml
@@ -31,7 +31,7 @@ jobs:
       run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}
 
     - name: Test
-      working-directory: ${{runner.workspace}}/build
+      working-directory: ${{github.workspace}}/build
       # Execute tests defined by the CMake configuration.  
       # See https://cmake.org/cmake/help/latest/manual/ctest.1.html for more detail
       run: ctest -C ${{env.BUILD_TYPE}}
diff --git a/ci/d.yml b/ci/d.yml
index 8ee1d1c..6086681 100644
--- a/ci/d.yml
+++ b/ci/d.yml
@@ -17,7 +17,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - uses: dlang-community/setup-dlang@7c3e57bdc1ff2d8994f00e61b3ef400e67d2d7ac
+    - uses: dlang-community/setup-dlang@4c99aa991ce7d19dd3064de0a4f2f6b2f152e2d7
 
     - name: 'Build & Test'
       run: |
diff --git a/ci/django.yml b/ci/django.yml
index 6ed9db8..dbde266 100644
--- a/ci/django.yml
+++ b/ci/django.yml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.7, 3.8, 3.9]
 
     steps:
     - uses: actions/checkout@v2
diff --git a/ci/go.yml b/ci/go.yml
index 16bff70..bcf4489 100644
--- a/ci/go.yml
+++ b/ci/go.yml
@@ -9,25 +9,14 @@ on:
 jobs:
 
   build:
-    name: Build
     runs-on: ubuntu-latest
     steps:
+    - uses: actions/checkout@v2
 
-    - name: Set up Go 1.x
+    - name: Set up Go
       uses: actions/setup-go@v2
       with:
-        go-version: ^1.13
-
-    - name: Check out code into the Go module directory
-      uses: actions/checkout@v2
-
-    - name: Get dependencies
-      run: |
-        go get -v -t -d ./...
-        if [ -f Gopkg.toml ]; then
-            curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh
-            dep ensure
-        fi
+        go-version: 1.15
 
     - name: Build
       run: go build -v ./...
diff --git a/ci/haskell.yml b/ci/haskell.yml
index 4c9a50c..c1d7dc7 100644
--- a/ci/haskell.yml
+++ b/ci/haskell.yml
@@ -15,8 +15,8 @@ jobs:
     - uses: actions/checkout@v2
     - uses: actions/setup-haskell@v1
       with:
-        ghc-version: '8.8.2'
-        cabal-version: '3.0'
+        ghc-version: '8.10.3'
+        cabal-version: '3.2'
 
     - name: Cache
       uses: actions/cache@v1
diff --git a/ci/node.js.yml b/ci/node.js.yml
index ce0cdcf..632c1a6 100644
--- a/ci/node.js.yml
+++ b/ci/node.js.yml
@@ -16,7 +16,8 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [10.x, 12.x, 14.x]
+        node-version: [10.x, 12.x, 14.x, 15.x]
+        # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps:
     - uses: actions/checkout@v2
diff --git a/ci/python-app.yml b/ci/python-app.yml
index 3b3e6a6..f6ad69a 100644
--- a/ci/python-app.yml
+++ b/ci/python-app.yml
@@ -16,10 +16,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.8
+    - name: Set up Python 3.9
       uses: actions/setup-python@v2
       with:
-        python-version: 3.8
+        python-version: 3.9
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
diff --git a/ci/python-package.yml b/ci/python-package.yml
index d2278f2..c88f6ce 100644
--- a/ci/python-package.yml
+++ b/ci/python-package.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.5', '3.6', '3.7', '3.8']
+        python-version: [3.7, 3.8, 3.9]
 
     steps:
     - uses: actions/checkout@v2
diff --git a/ci/ruby.yml b/ci/ruby.yml
index 48242ff..f6ae1e3 100644
--- a/ci/ruby.yml
+++ b/ci/ruby.yml
@@ -17,6 +17,9 @@ jobs:
   test:
 
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version: ['2.6', '2.7', '3.0']
 
     steps:
     - uses: actions/checkout@v2
@@ -24,10 +27,9 @@ jobs:
     # To automatically get bug fixes and new Ruby versions for ruby/setup-ruby,
     # change this to (see https://github.com/ruby/setup-ruby#versioning):
     # uses: ruby/setup-ruby@v1
-      uses: ruby/setup-ruby@21351ecc0a7c196081abca5dc55b08f085efe09a
+      uses: ruby/setup-ruby@473e4d8fe5dd94ee328fdfca9f8c9c7afc9dae5e
       with:
-        ruby-version: 2.6
-    - name: Install dependencies
-      run: bundle install
+        ruby-version: ${{ matrix.ruby-version }}
+        bundler-cache: true # runs 'bundle install' and caches installed gems automatically
     - name: Run tests
       run: bundle exec rake