diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e0ef3016..701e76b2 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -7,11 +7,10 @@ jobs:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0 # needed for fetchGit in default.nix
-      - uses: cachix/install-nix-action@v14.1
+      - uses: cachix/install-nix-action@v18
         with:
           nix_path: nixpkgs=channel:nixos-unstable
-          install_url: "https://releases.nixos.org/nix/nix-2.3.16/install"
-      - uses: cachix/cachix-action@v10
+      - uses: cachix/cachix-action@v12
         with:
           name: arximboldi
           signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
@@ -31,11 +30,10 @@ jobs:
       - uses: actions/checkout@v2
         with:
           submodules: true
-      - uses: cachix/install-nix-action@v14.1
+      - uses: cachix/install-nix-action@v18
         with:
           nix_path: nixpkgs=channel:nixos-unstable
-          install_url: "https://releases.nixos.org/nix/nix-2.3.16/install"
-      - uses: cachix/cachix-action@v10
+      - uses: cachix/cachix-action@v12
         with:
           name: arximboldi
           signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
@@ -95,11 +93,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: cachix/install-nix-action@v14.1
+      - uses: cachix/install-nix-action@v18
         with:
           nix_path: nixpkgs=channel:nixos-unstable
-          install_url: "https://releases.nixos.org/nix/nix-2.3.16/install"
-      - uses: cachix/cachix-action@v10
+      - uses: cachix/cachix-action@v12
         with:
           name: arximboldi
           signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2362ecb7..a8cfbd3b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@ cmake_policy(SET CMP0048 NEW) # enable project VERSION
 cmake_policy(SET CMP0056 NEW) # honor link flags in try_compile()
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 
-project(immer VERSION 0.7.0)
+project(immer VERSION 0.8.0)
 
 if (NOT MSVC)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -pedantic -Wno-unused-parameter -Wno-extended-offsetof -Wno-c++17-extensions -Wno-c++1z-extensions -Wno-unknown-warning-option -Wno-type-limits")