diff --git a/.github/actions/numpy_vers/action.yml b/.github/actions/numpy_vers/action.yml
index d93dfff765..d22864dda2 100644
--- a/.github/actions/numpy_vers/action.yml
+++ b/.github/actions/numpy_vers/action.yml
@@ -26,17 +26,21 @@ runs:
         case "${OS}:${ARCH}" in
             Linux:x86_64)
                 case "${{ inputs.pyver }}" in
+                    3.6*)
+                        NUMPY_BUILD_VERSION="==1.19.2"
+                        NUMPY_DEP_VERSION=">=1.19.2"
+                    ;;
                     3.7*)
-                        NUMPY_BUILD_VERSION="==1.14.5"
-                        NUMPY_DEP_VERSION=">=1.14.5"
+                        NUMPY_BUILD_VERSION="==1.19.3"
+                        NUMPY_DEP_VERSION=">=1.19.3"
                     ;;
                     3.8*)
-                        NUMPY_BUILD_VERSION="==1.17.3"
-                        NUMPY_DEP_VERSION=">=1.17.3"
+                        NUMPY_BUILD_VERSION="==1.19.2"
+                        NUMPY_DEP_VERSION=">=1.19.2"
                     ;;
                     3.9*)
-                        NUMPY_BUILD_VERSION="==1.19.4"
-                        NUMPY_DEP_VERSION=">=1.19.4"
+                        NUMPY_BUILD_VERSION="==1.19.3"
+                        NUMPY_DEP_VERSION=">=1.19.3"
                     ;;
                 esac
             ;;
@@ -44,20 +48,20 @@ runs:
             Darwin:*)
                 case "${{ inputs.pyver }}" in
                     3.6*)
-                        NUMPY_BUILD_VERSION="==1.9.0"
-                        NUMPY_DEP_VERSION=">=1.9.0"
+                        NUMPY_BUILD_VERSION="==1.13.3"
+                        NUMPY_DEP_VERSION=">=1.13.3"
                     ;;
                     3.7*)
                         NUMPY_BUILD_VERSION="==1.14.5"
-                        NUMPY_DEP_VERSION=">=1.14.5,<=1.17.0"
+                        NUMPY_DEP_VERSION=">=1.14.5"
                     ;;
                     3.8*)
-                        NUMPY_BUILD_VERSION="==1.17.3"
-                        NUMPY_DEP_VERSION=">=1.17.3,<=1.17.3"
+                        NUMPY_BUILD_VERSION="==1.20.0"
+                        NUMPY_DEP_VERSION=">=1.20.0"
                     ;;
                     3.9*)
-                        NUMPY_BUILD_VERSION="==1.19.4"
-                        NUMPY_DEP_VERSION=">=1.19.4"
+                        NUMPY_BUILD_VERSION="==1.20.0"
+                        NUMPY_DEP_VERSION=">=1.20.0"
                     ;;
                 esac
             ;;
@@ -65,24 +69,24 @@ runs:
             ${CI_MSYS_VERSION}:x86_64)
                 case "${{ inputs.pyver }}" in
                     3.5*)
-                        NUMPY_BUILD_VERSION="==1.11.0"
-                        NUMPY_DEP_VERSION=">=1.11.0,<1.12.0"
+                        NUMPY_BUILD_VERSION="==1.16.0"
+                        NUMPY_DEP_VERSION=">=1.16.0"
                     ;;
                     3.6*)
-                        NUMPY_BUILD_VERSION="==1.12.0"
-                        NUMPY_DEP_VERSION=">=1.12.0,<1.14.5"
+                        NUMPY_BUILD_VERSION="==1.16.0"
+                        NUMPY_DEP_VERSION=">=1.16.0"
                     ;;
                     3.7*)
-                        NUMPY_BUILD_VERSION="==1.14.5"
-                        NUMPY_DEP_VERSION=">=1.14.5,<=1.17.0"
+                        NUMPY_BUILD_VERSION="==1.16.0"
+                        NUMPY_DEP_VERSION=">=1.16.0"
                     ;;
                     3.8*)
                         NUMPY_BUILD_VERSION="==1.17.3"
-                        NUMPY_DEP_VERSION=">=1.17.3,<=1.17.3"
+                        NUMPY_DEP_VERSION=">=1.17.3"
                     ;;
                     3.9*)
-                        NUMPY_BUILD_VERSION="==1.19.4"
-                        NUMPY_DEP_VERSION=">=1.19.4"
+                        NUMPY_BUILD_VERSION="==1.19.3"
+                        NUMPY_DEP_VERSION=">=1.19.3"
                     ;;
                 esac
             ;;
diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 5291d109bc..fc65caff31 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -113,13 +113,16 @@ jobs:
     needs: [ swig_Linux ]
     runs-on: ubuntu-20.04
     if: ${{ github.event_name == 'pull_request' }}
+    strategy:
+      matrix:
+        python-version: [3.6, 3.7, 3.8, 3.9]
     steps:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
       - uses: actions/setup-python@v2
         with:
-          python-version: 3.6
+          python-version: ${{ matrix.python-version }}
       - run: |
           python --version
           pip --version
@@ -135,7 +138,7 @@ jobs:
       - id: get_numpy
         uses: ./.github/actions/numpy_vers
         with:
-          pyver: 3.6
+          pyver: ${{ matrix.python-version }}
       - name: Make decoder package
         run: |
           NUMPY_BUILD_VERSION=${{ steps.get_numpy.outputs.build_version }} \
@@ -651,13 +654,16 @@ jobs:
     needs: [ swig_macOS ]
     runs-on: macos-10.15
     if: ${{ github.event_name == 'pull_request' }}
+    strategy:
+      matrix:
+        python-version: [3.6.8, 3.7.9, 3.8.8, 3.9.2]
     steps:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
       - uses: ./.github/actions/install-python-upstream
         with:
-          version: 3.6.8
+          version: ${{ matrix.python-version }}
       - run: |
           python --version
           pip --version
@@ -673,7 +679,7 @@ jobs:
       - id: get_numpy
         uses: ./.github/actions/numpy_vers
         with:
-          pyver: 3.6.8
+          pyver: ${{ matrix.python-version }}
       - name: Make decoder package
         run: |
           NUMPY_BUILD_VERSION=${{ steps.get_numpy.outputs.build_version }} \
@@ -1146,6 +1152,9 @@ jobs:
     name: "Win|Build CTC decoder Python package"
     needs: [swig_Windows_crosscompiled]
     runs-on: windows-2019
+    strategy:
+      matrix:
+        python-version: [[3.6.8, 3.7.9, 3.8.8, 3.9.2]]
     steps:
       - name: Switch git-bash shell to MSYS2 shell by adding MSYS2 path to PATH front
         run: echo "$MSYS2_SHELL_PATH" >> $GITHUB_PATH
@@ -1163,7 +1172,7 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-python@v2
         with:
-          python-version: 3.7.9
+          python-version: ${{ matrix.python-version }}
       - run: |
           python --version
           python -m pip --version