diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 062f3f622..c4f87f9d8 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -66,8 +66,8 @@ jobs:
       - name: Install coverxygen and codecov
         run: |
             apt-get update && apt-get --assume-yes install python3-venv curl
-            python3 -m venv venv
-            . venv/bin/activate
+            python3 -m venv .venv
+            . .venv/bin/activate
             pip install setuptools --upgrade
             pip install 'coverxygen>=1.3.1' codecov
       - name: Download XML documentation artifact
@@ -78,7 +78,7 @@ jobs:
           path: /tmp/xml-doc
       - name: Establish documentation coverage
         run: |
-            . venv/bin/activate
+            . .venv/bin/activate
             python -m coverxygen --src-dir ${{ github.workspace }}      \
             --xml-dir ${{steps.xml-doc-download.outputs.download-path}} \
             --output lcov.info
diff --git a/.github/workflows/release-pontos-patch.yml b/.github/workflows/release-pontos-patch.yml
index 40900e348..25306973c 100644
--- a/.github/workflows/release-pontos-patch.yml
+++ b/.github/workflows/release-pontos-patch.yml
@@ -1,4 +1,4 @@
-name: Release Python package with pontos
+name: Release patch version with pontos
 
 on:
   pull_request:
@@ -26,8 +26,8 @@ jobs:
     - name: Install pontos
       run: |
         apt-get update && apt-get --assume-yes install python3-venv
-        python3 -m venv venv
-        . venv/bin/activate
+        python3 -m venv .venv
+        . .venv/bin/activate
         python -m pip install --upgrade pip
         python -m pip install --upgrade pontos
     - name: Tell git who I am
@@ -41,9 +41,9 @@ jobs:
       run: echo "Current Branch is $GITHUB_BASE_REF"
     - name: Prepare patch release with pontos
       run: |
-        . venv/bin/activate
+        . .venv/bin/activate
         pontos-release prepare --patch
     - name: Release with pontos
       run: |
-        . venv/bin/activate
+        . .venv/bin/activate
         pontos-release release
diff --git a/.gitignore b/.gitignore
index bef7e4064..0bde0085c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 build/
 tags
 .ccls
+.venv
diff --git a/CMakeLists.txt b/CMakeLists.txt
index d28ce9b09..84d9a05ac 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,7 +20,7 @@ cmake_minimum_required (VERSION 3.0)
 message ("-- Configuring Greenbone Vulnerability Manager...")
 
 project (gvm
-         VERSION 21.4.0
+         VERSION 21.4.1
          LANGUAGES C)
 
 if (POLICY CMP0005)
@@ -53,7 +53,7 @@ endif (NOT CMAKE_BUILD_TYPE MATCHES "Release")
 
 # Set dev version if this is a development version and not a full release,
 # unset (put value 0 or delete line) before a full release and reset after.
-set (PROJECT_DEV_VERSION 0)
+set (PROJECT_DEV_VERSION 1)
 
 # If PROJECT_DEV_VERSION is set, the version string will be set to:
 #   "major.minor.patch~dev${PROJECT_DEV_VERSION}${GIT_REVISION}"
diff --git a/INSTALL.md b/INSTALL.md
index 7db89069a..761b659b4 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -11,7 +11,7 @@ Prerequisites:
 * cmake >= 3.0 (Debian package: cmake)
 * glib-2.0 >= 2.42 (Debian package: libglib2.0-dev)
 * gnutls >= 3.2.15 (Debian package: libgnutls28-dev)
-* libgvm_base, libgvm_util, libgvm_osp, libgvm_gmp >= 20.08.0 ([gvm-libs](https://github.com/greenbone/gvm-libs/tree/gvm-libs-20.08) component)
+* libgvm_base, libgvm_util, libgvm_osp, libgvm_gmp >= 20.4.1 ([gvm-libs](https://github.com/greenbone/gvm-libs/tree/gvm-libs-20.08) component)
 * PostgreSQL database >= 9.6 (Debian packages: libpq-dev postgresql-server-dev-11)
 * pkg-config (Debian package: pkg-config)
 * libical >= 1.0.0 (Debian package: libical-dev)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index c06c798da..959960d86 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -26,10 +26,10 @@ find_package (Threads)
 ## list and throw an error, otherwise long install-cmake-install-cmake cycles
 ## might occur.
 
-pkg_check_modules (LIBGVM_BASE REQUIRED libgvm_base>=21.04.0)
-pkg_check_modules (LIBGVM_UTIL REQUIRED libgvm_util>=21.04.0)
-pkg_check_modules (LIBGVM_OSP REQUIRED libgvm_osp>=21.04.0)
-pkg_check_modules (LIBGVM_GMP REQUIRED libgvm_gmp>=21.04.0)
+pkg_check_modules (LIBGVM_BASE REQUIRED libgvm_base>=21.4.1)
+pkg_check_modules (LIBGVM_UTIL REQUIRED libgvm_util>=21.4.1)
+pkg_check_modules (LIBGVM_OSP REQUIRED libgvm_osp>=21.4.1)
+pkg_check_modules (LIBGVM_GMP REQUIRED libgvm_gmp>=21.4.1)
 pkg_check_modules (GNUTLS REQUIRED gnutls>=3.2.15)
 pkg_check_modules (GLIB REQUIRED glib-2.0>=2.42)
 pkg_check_modules (LIBICAL REQUIRED libical>=1.00)