diff --git a/nix/lib/mkFilter_test.nix b/nix/lib/mkFilter_test.nix
index 492f6a49e9..9651c48d44 100644
--- a/nix/lib/mkFilter_test.nix
+++ b/nix/lib/mkFilter_test.nix
@@ -51,10 +51,6 @@ let
     { path = "${absPath}/ios/subfile"; type = "file";
       expected = false; }
   ];
-  # make paths absolute
-  testsAbs = builtins.map (
-    t: t // { path = "${absPath}/${t.path}"; }
-  ) tests;
 in builtins.map (
     t: let
       rval = (filter t.path t.type);
diff --git a/nix/mobile/android/default.nix b/nix/mobile/android/default.nix
index ca8b8d4f50..d96ce3b9d2 100644
--- a/nix/mobile/android/default.nix
+++ b/nix/mobile/android/default.nix
@@ -1,4 +1,4 @@
-{ lib, pkgs, deps, callPackage, mkShell
+{ pkgs, deps, callPackage, mkShell
 , status-go, androidPkgs, androidShell }:
 
 let
diff --git a/nix/mobile/android/release.nix b/nix/mobile/android/release.nix
index b8b634cf5f..799e6f39dd 100644
--- a/nix/mobile/android/release.nix
+++ b/nix/mobile/android/release.nix
@@ -1,6 +1,5 @@
-{ stdenv, pkgs, deps, lib, config, callPackage,
-  watchmanFactory, androidPkgs, patchMavenSources,
-  jsbundle, status-go }:
+{ stdenv, pkgs, deps, lib, watchmanFactory
+, androidPkgs, patchMavenSources, jsbundle, status-go }:
 
 {
   # Value for BUILD_ENV checked by Clojure code at compile time
@@ -15,9 +14,7 @@
 assert (lib.stringLength watchmanSockPath) > 0 -> stdenv.isDarwin;
 
 let
-  inherit (lib)
-    toLower optionalString stringLength assertMsg
-    getConfig makeLibraryPath checkEnvVarSet elem;
+  inherit (lib) toLower optionalString stringLength getConfig makeLibraryPath elem;
 
   # Pass secretsFile for INFURA_TOKEN to jsbundle build
   builtJsBundle = jsbundle { inherit secretsFile; };
@@ -29,9 +26,6 @@ let
   # Used to detect end-to-end builds
   androidAbiInclude = getConfig "android.abi-include" "armeabi-v7a;arm64-v8a;x86";
 
-  baseName = "${buildType}-android";
-  name = "status-react-build-${baseName}";
-
   envFileName = 
     if androidAbiInclude == "x86"                  then ".env.e2e" 
     else if (elem buildType ["release" "nightly"]) then ".env.${buildType}"
@@ -44,8 +38,10 @@ let
   apksPath = "./android/app/build/outputs/apk/${toLower gradleBuildType}";
   patchedWatchman = watchmanFactory watchmanSockPath;
 
+  baseName = "${buildType}-android";
 in stdenv.mkDerivation rec {
-  inherit name;
+  name = "status-react-build-${baseName}";
+
   src = let path = ./../../..;
   # We use builtins.path so that we can name the resulting derivation
   in builtins.path {
diff --git a/nix/mobile/default.nix b/nix/mobile/default.nix
index 1d29692a45..470a3378a8 100644
--- a/nix/mobile/default.nix
+++ b/nix/mobile/default.nix
@@ -1,8 +1,6 @@
-{ config, lib, stdenvNoCC, callPackage, mkShell, status-go }:
+{ lib, callPackage, mkShell, status-go }:
 
 let
-  inherit (lib) catAttrs concatStrings optional unique;
-
   fastlane = callPackage ./fastlane { };
 
   android = callPackage ./android {
@@ -24,7 +22,7 @@ let
 
 in {
   shell = mkShell {
-    inputsFrom = (catAttrs "shell" selectedSources);
+    inputsFrom = lib.catAttrs "shell" selectedSources;
   };
 
   # TARGETS
diff --git a/nix/mobile/ios/status-go-shell.nix b/nix/mobile/ios/status-go-shell.nix
index 177fa3b71b..03d4eb09db 100644
--- a/nix/mobile/ios/status-go-shell.nix
+++ b/nix/mobile/ios/status-go-shell.nix
@@ -3,7 +3,7 @@
 # It copies the status-go build result to 'modules/react-native-status/ios/RCTStatus'.
 #
 
-{ lib, mkShell, status-go }:
+{ mkShell, status-go }:
 
 mkShell {
   shellHook = ''
diff --git a/nix/pkgs/aapt2/default.nix b/nix/pkgs/aapt2/default.nix
index 454dc3a302..c74fb6211f 100644
--- a/nix/pkgs/aapt2/default.nix
+++ b/nix/pkgs/aapt2/default.nix
@@ -2,11 +2,10 @@
 # It is used by Gradle to package Android app resources.
 # See: https://developer.android.com/studio/command-line/aapt2
 
-{ lib, stdenv, deps, pkgs, fetchurl }:
+{ lib, stdenv, pkgs, fetchurl }:
 
 let
   inherit (lib) getAttr optionals;
-  inherit (pkgs) zip unzip patchelf;
   inherit (stdenv) isLinux isDarwin;
 
   pname = "aapt2";
@@ -53,7 +52,7 @@ in stdenv.mkDerivation {
   srcs = with urls; [ jar sha pom ];
   phases = [ "unpackPhase" ]
     ++ optionals isLinux [ "patchPhase" ]; # OSX binaries don't need patchelf
-  buildInputs = [ zip unzip patchelf ];
+  buildInputs = with pkgs; [ zip unzip patchelf ];
 
   unpackPhase = ''
     mkdir -p $out
@@ -71,15 +70,15 @@ in stdenv.mkDerivation {
 
     # Patch executables from maven dependency to use Nix's interpreter
     tmpDir=$(mktemp -d)
-    ${unzip}/bin/unzip $out/${filenames.jar} -d $tmpDir
+    unzip $out/${filenames.jar} -d $tmpDir
     for exe in `find $tmpDir/ -type f -executable`; do
-      ${patchelf}/bin/patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" $exe
+      patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" $exe
     done
 
     # Rebuild the .jar file with patched binaries
     pushd $tmpDir > /dev/null
     chmod u+w $out/${filenames.jar}
-    ${zip}/bin/zip -fr $out/${filenames.jar}
+    zip -fr $out/${filenames.jar}
     chmod $out/${filenames.jar} --reference=$out/${filenames.jar}.sha1
     popd > /dev/null
     rm -rf $tmpDir
diff --git a/nix/pkgs/android-sdk/compose.nix b/nix/pkgs/android-sdk/compose.nix
index b05849dcca..3f35d67129 100644
--- a/nix/pkgs/android-sdk/compose.nix
+++ b/nix/pkgs/android-sdk/compose.nix
@@ -3,7 +3,7 @@
 # for the Android development environment.
 #
 
-{ stdenv, config, callPackage, androidenv, openjdk, mkShell }:
+{ androidenv }:
 
 # The "android-sdk-license" license is accepted
 # by setting android_sdk.accept_license = true.
diff --git a/nix/pkgs/android-sdk/default.nix b/nix/pkgs/android-sdk/default.nix
index 7c7233d658..f3f795251d 100644
--- a/nix/pkgs/android-sdk/default.nix
+++ b/nix/pkgs/android-sdk/default.nix
@@ -3,7 +3,7 @@
 # for the Android development environment.
 #
 
-{ callPackage, stdenv, writeScript }:
+{ callPackage }:
 
 let
   compose = callPackage ./compose.nix { };
diff --git a/nix/pkgs/go-maven-resolver/default.nix b/nix/pkgs/go-maven-resolver/default.nix
index b897f48825..3081157585 100644
--- a/nix/pkgs/go-maven-resolver/default.nix
+++ b/nix/pkgs/go-maven-resolver/default.nix
@@ -1,8 +1,6 @@
-{ lib, buildGoModule, fetchFromGitHub }:
+{ buildGoModule, fetchFromGitHub }:
 
-let
-  inherit (lib) strings;
-in buildGoModule rec {
+buildGoModule rec {
   pname = "go-maven-resolver";
   version = "v1.1.2";
 
diff --git a/nix/shells.nix b/nix/shells.nix
index 3e0c2f2636..ad91eb76e1 100644
--- a/nix/shells.nix
+++ b/nix/shells.nix
@@ -71,7 +71,7 @@ let
   };
 
   # for merging the default shell with others
-  mergeDefaultShell = (key: val: lib.mergeSh default [ val ]);
+  mergeDefaultShell = (_: val: lib.mergeSh default [ val ]);
 
 # values here can be selected using `nix-shell --attr shells.$TARGET default.nix`
 # the nix/scripts/shell.sh wrapper does this for us and expects TARGET to be set
diff --git a/nix/status-go/default.nix b/nix/status-go/default.nix
index beb970b33e..f56a32e93d 100644
--- a/nix/status-go/default.nix
+++ b/nix/status-go/default.nix
@@ -1,4 +1,4 @@
-{ lib, callPackage, mkShell, openjdk, androidPkgs }:
+{ lib, callPackage, mkShell }:
 
 let
   inherit (lib) attrValues mapAttrs;
@@ -40,7 +40,6 @@ in rec {
     inherit meta source;
   };
 
-
   shell = mkShell {
     inputsFrom = [ mobile.android mobile.ios ];
   };
diff --git a/nix/status-go/library/default.nix b/nix/status-go/library/default.nix
index e862774e77..049a5ea9c4 100644
--- a/nix/status-go/library/default.nix
+++ b/nix/status-go/library/default.nix
@@ -1,13 +1,8 @@
-{ lib, stdenv, utils, buildGoPackage
-, go, xcodeWrapper
+{ buildGoPackage
 # object with source attributes
 , meta, source}:
 
-let
-  inherit (stdenv) isDarwin;
-  inherit (lib) optional;
-
-in buildGoPackage {
+buildGoPackage {
   pname = source.repo;
   version = "${source.cleanVersion}-${source.shortRev}";
 
@@ -25,9 +20,7 @@ in buildGoPackage {
   # Build the Go library
   buildPhase = ''
     runHook preBuild
-
-    go build -buildmode=c-archive -o $out/libstatus.a  $NIX_BUILD_TOP/main.go
-
+    go build -buildmode=c-archive -o $out/libstatus.a $NIX_BUILD_TOP/main.go
     runHook postBuild
   '';
 }
diff --git a/nix/status-go/mobile/build.nix b/nix/status-go/mobile/build.nix
index 1a0f7e3b1c..d76bb81926 100644
--- a/nix/status-go/mobile/build.nix
+++ b/nix/status-go/mobile/build.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, utils, callPackage, buildGoPackage
+{ lib, stdenv, utils, buildGoPackage
 , go, androidPkgs, openjdk, gomobile, xcodeWrapper
 # object with source attributes
 , meta, source
@@ -13,9 +13,7 @@
 
 let
   inherit (stdenv) isDarwin;
-  inherit (lib)
-    concatStrings concatStringsSep concatMapStrings optionalString
-    getAttr attrValues makeBinPath optional;
+  inherit (lib) concatStringsSep concatMapStrings optionalString makeBinPath optional;
 
   removeReferences = [ go ];
   removeExpr = refs: ''remove-references-to ${concatMapStrings (ref: " -t ${ref}") refs}'';
diff --git a/nix/status-go/source.nix b/nix/status-go/source.nix
index ca33f8a0e0..7a5e03a0e9 100644
--- a/nix/status-go/source.nix
+++ b/nix/status-go/source.nix
@@ -1,7 +1,7 @@
-{ config, utils, lib, callPackage, fetchFromGitHub }:
+{ utils, lib, fetchFromGitHub }:
 
 let
-  inherit (lib) strings traceValFn attrByPath importJSON getConfig;
+  inherit (lib) strings traceValFn importJSON getConfig;
 
   srcOverride = getConfig "status-go.src-override" null;
   # Warning message about using local sources
diff --git a/nix/tools/envParser.nix b/nix/tools/envParser.nix
index e0bd3b8cd4..1dcc8c7659 100644
--- a/nix/tools/envParser.nix
+++ b/nix/tools/envParser.nix
@@ -1,12 +1,11 @@
 # This Nix expression takes care of reading/parsing the correct .env configuration file and return it as an attr set
-{ config, stdenv, lib }:
+{ config, lib }:
 
 let
   inherit (builtins) listToAttrs head tail readFile;
   inherit (lib) attrByPath filter hasPrefix nameValuePair splitString;
 
   build-type = attrByPath ["status-im" "build-type"] "" config;
-  ci = (attrByPath ["status-im" "ci"] "" config) != "";
 
   readLinesFromFile =
     file:
diff --git a/nix/tools/gradlePropParser.nix b/nix/tools/gradlePropParser.nix
index 483e2b2b94..891177e46f 100644
--- a/nix/tools/gradlePropParser.nix
+++ b/nix/tools/gradlePropParser.nix
@@ -11,7 +11,7 @@ let
   lines = splitString "\n" (readFile gradlePropsFile);
 
   isKeyValueLine = line: line != "" && !hasPrefix "#" line;
-  cleanup = lines: filter isKeyValueLine lines;
+  cleanup = filter isKeyValueLine;
   extractKeyValues = line:
     let flag = splitString "=" line;
     in nameValuePair (head flag) (last flag);
diff --git a/nix/tools/utils.nix b/nix/tools/utils.nix
index 3ccea1713e..53965cf2d6 100644
--- a/nix/tools/utils.nix
+++ b/nix/tools/utils.nix
@@ -53,9 +53,9 @@ let
   sanitizeVersion = version:
     if (builtins.match versionRegex version) != null
     # Geth forces a 'v' prefix for all versions
-    then lib.removePrefix "v" (dropSlashes version) 
+    then lib.removePrefix "v" (dropSlashes version)
     # reduce metrics cardinality in Prometheus
-    else lib.traceValFn (v: "WARNING: Marking build version as 'develop'!") "develop"; 
+    else lib.traceValFn (_: "WARNING: Marking build version as 'develop'!") "develop";
 
 in {
   inherit sanitizeVersion