diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0596ef6a..99c96321 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -262,7 +262,7 @@ jobs:
         run: |
           pacman -S --needed --noconfirm mingw-w64-x86_64-gmp mingw-w64-x86_64-llvm
           nimble refresh --verbose -y
-          nimble install --verbose -y gmp jsony asynctools yaml@1.1.0 cliche
+          nimble install --verbose -y gmp@#head jsony asynctools yaml@1.1.0 cliche
 
           cd constantine
           go mod download -modfile=go_test.mod
@@ -272,7 +272,7 @@ jobs:
         shell: bash
         run: |
           nimble refresh --verbose -y
-          nimble install --verbose -y gmp jsony asynctools yaml@1.1.0 cliche
+          nimble install --verbose -y gmp@#head jsony asynctools yaml@1.1.0 cliche
 
           cd constantine
           go mod download -modfile=go_test.mod
diff --git a/benchmarks/zkalc.nim b/benchmarks/zkalc.nim
index 3b67f716..c4308ca4 100644
--- a/benchmarks/zkalc.nim
+++ b/benchmarks/zkalc.nim
@@ -28,7 +28,7 @@ import
   # Helpers
   helpers/prng_unsafe,
   # Standard library
-  std/[stats, monotimes, times, strformat, strutils, cmdline, macros],
+  std/[stats, monotimes, times, strformat, strutils, os, macros],
   # Third-party
   jsony, cliche
 
diff --git a/constantine.nimble b/constantine.nimble
index 08736e7d..9548fa3d 100644
--- a/constantine.nimble
+++ b/constantine.nimble
@@ -15,11 +15,11 @@ when (NimMajor, NimMinor) >= (2, 0): # Task-level dependencies
 
   taskRequires "test", "jsony"
   taskRequires "test", "yaml"
-  taskRequires "test", "gmp"
+  taskRequires "test", "gmp@#head"
 
   taskRequires "test_parallel", "jsony"
   taskRequires "test_parallel", "yaml"
-  taskRequires "test_parallel", "gmp"
+  taskRequires "test_parallel", "gmp@#head"
 
   taskRequires "test_no_gmp", "jsony"
   taskRequires "test_no_gmp", "yaml"