diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index 5a42f99..2d51cb5 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -26,13 +26,13 @@
             r-version: 3.6
             python-version: 3.9
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v2.2.2
       with:
         python-version: ${{ matrix.python-version }}
     - name: Cache pip
-      uses: actions/cache@v2
+      uses: actions/cache@v2.1.5
       with:
         # This path is specific to Ubuntu
         path: ~/.cache/pip
@@ -56,13 +56,13 @@
     - name: Install R dependencies
       run: Rscript -e "install.packages('RKorAPClient')"
     - name: Cache R packages on Linux
-      uses: actions/cache@v1
+      uses: actions/cache@v2.1.5
       with:
         path: /usr/local/lib/R/site-library
         key: ${{ runner.os }}-r-${{ matrix.config.r-version }}-${{ hashFiles('DESCRIPTION') }}
       if: runner.os == 'Linux'
     - name: Cache R packages
-      uses: actions/cache@v1
+      uses: actions/cache@v2.1.5
       with:
         path: ${{ env.R_LIBS_USER }}
         key: ${{ runner.os }}-r-${{ matrix.config.r-version }}-${{ hashFiles('DESCRIPTION') }}
diff --git a/KorAPClient/__init__.py b/KorAPClient/__init__.py
index 1b31222..c6e6699 100644
--- a/KorAPClient/__init__.py
+++ b/KorAPClient/__init__.py
@@ -8,7 +8,7 @@
 from packaging import version
 import warnings
 
-CURRENT_R_PACKAGE_VERSION = "0.6.1"
+CURRENT_R_PACKAGE_VERSION = "0.6.1.9000"
 
 KorAPClient = packages.importr('RKorAPClient')
 if version.parse(KorAPClient.__version__) < version.parse(CURRENT_R_PACKAGE_VERSION):