diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 19aa68cd..9def2cf9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -118,7 +118,7 @@ jobs:
             - name: Prepare build environment
               run: |
                   echo 'source $HOME/.nix-profile/share/nix-direnv/direnvrc' > "$HOME/.direnvrc"
-                  nix profile install --impure --inputs-from . nixpkgs#direnv nixpkgs#nix-direnv
+                  nix profile install --inputs-from . nixpkgs#direnv nixpkgs#nix-direnv
                   direnv allow
                   nix develop .#all-features --command true
 
@@ -240,7 +240,7 @@ jobs:
             - name: Prepare build environment
               run: |
                   echo 'source $HOME/.nix-profile/share/nix-direnv/direnvrc' > "$HOME/.direnvrc"
-                  nix profile install --impure --inputs-from . nixpkgs#direnv nixpkgs#nix-direnv
+                  nix profile install --inputs-from . nixpkgs#direnv nixpkgs#nix-direnv
                   direnv allow
                   nix develop .#all-features --command true
 
diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
index cab1710f..c6f9133a 100644
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@@ -101,7 +101,7 @@ jobs:
       - name: Prepare build environment
         run: |
             echo 'source $HOME/.nix-profile/share/nix-direnv/direnvrc' > "$HOME/.direnvrc"
-            nix profile install --impure --inputs-from . nixpkgs#direnv nixpkgs#nix-direnv
+            nix profile install --inputs-from . nixpkgs#direnv nixpkgs#nix-direnv
             direnv allow
             nix develop --command true